POTASSIUM SILVER CYANIDE

Editor's Note: This material is not listed in the Emergency Response Guidebook. Based on the material's physical and chemical properties, toxicity, or chemical group, a guide has been assigned. For additional technical information, contact one of the emergency response telephone numbers listed under Public Safety Measures.

STCC NUMBER

4960132

MOLECULAR FORMULA

C2-Ag-N2.K

ERG GUIDE NUMBER

157-SUBSTANCES - TOXIC and/or CORROSIVE (NON-COMBUSTIBLE / WATER-SENSITIVE)

SYNONYM REFERENCE

(RTECS , 1990; HSDB , 1990; EPA, 1985; Sax & Lewis, 1987)

USES/FORMS/SOURCES

USES

Potassium silver cyanide is used in silver electroplating, as a bactericidal agent, in the manufacture of antiseptics, and to extract silver from its ores (EPA, 1985; Budavari, 1989; Sax & Lewis, 1987) HSDB, 1997).

FORMS

Potassium silver cyanide is a complex cyanide compound. It is a water soluble, light sensitive, white crystalline solid (HSDB, 1997; (EPA, 1985; Budavari, 1989; Sax & Lewis, 1987; Sax & Lewis, 1989).
Potassium silver cyanide is a CYANIDE COMPOUND (EPA, 1985). This review is based on the effects of cyanide in general, with effects attributed specifically to potassium silver cyanide noted.
CYANIDE is an extremely toxic poison in acute exposure, with a probable lethal human dose being less than 350 mg (HSDB, 1997). It is present in automotive emissions (3), in cigarette smoke (HSDB, 1997), and can be a major combustion product in fires, particularly from burning plastics (Peuser, 1984).
Cyanide acts by inhibiting cellular respiration. It binds strongly to the iron in mitochondrial cytochrome oxidase, preventing cellular oxygen utilization.
The toxicity of cyanide has been reviewed for acute (Hall & Rumack, 1986) and chronic (3; Saia et al, 1970) exposures.

-CLINICAL EFFECTS

GENERAL CLINICAL EFFECTS

Potassium silver cyanide is a complex cyanide compound. It is a severe irritant of the eyes and skin, but its primary health hazard is as a CYANIDE COMPOUND. The following information pertains to the evaluation and treatment of CYANIDE POISONING.

Chronic occupational cyanide exposure has been associated with a variety of dermal and mucous membrane irritant complaints, usually attributed to exposure to highly alkaline aerosols or solutions of cyanide salts.

True chronic cyanide toxicity in humans is rare, although a variety of complaints including goiter, subclinical thyroid disfunction, B12 and folate abnormalities, headaches, vertigo, chest discomfort, palpitations, eye and respiratory irritation, dermatitis, fatigue, poor appetite and sleeping, and epistaxis have been recorded in cyanide-exposed workers.

Functional changes in hearing, loss of appetite, headache, weakness, nausea, dizziness, upper respiratory tract irritation, and dermatoses have been described in chronically exposed workers. Dermal contact with cyanide solutions can cause itching and irritation, probably because these solutions are alkaline.

Cyanide exposure may produce death within minutes. IMMEDIATELY BEGIN ADMINISTERING 100% OXYGEN. OBTAIN THE CYANIDE ANTIDOTE KIT AND PREPARE IT FOR USE.

Lesser exposures may produce nausea, vomiting, palpitations, confusion, hyperventilation, anxiety, and vertigo. Severe hypoxic signs in the absence of cyanosis suggest the diagnosis. Patients have survived potentially lethal ingestions with supportive care only, and the absence of a rapidly deteriorating course does not exclude the diagnosis.
Cyanosis is generally a late finding and does not occur until the stage of circulatory collapse and apnea. Initially the patient may experience flushing, tachycardia, tachypnea, headache, and dizziness. This may progress to agitation, stupor, coma, apnea, generalized convulsions, pulmonary edema, bradycardia, hypotension, and death.

Percutaneous absorption has been rarely said to result in systemic toxicity, although most such cases have involved either complete immersion in cyanide-salt solutions or large-area burns with molten cyanide.

POTENTIAL HEALTH HAZARDS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns, or death.
Reaction with water or moist air will release toxic, corrosive or flammable gases.
Reaction with water may generate much heat which will increase the concentration of fumes in the air.
Fire will produce irritating, corrosive and/or toxic gases.
Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

ACUTE CLINICAL EFFECTS

From its acute oral LD50 of 20.9 mg/kg in rats (RTECS, 1997), potassium silver cyanide is a highly toxic substance. It is approximately as toxic as POTASSIUM CYANIDE on a molar basis. Virtually all of its toxicity can be accounted for by the cyanide component.

Potassium silver cyanide is a severe irritant of the eyes and skin (RTECS, 1997; (Sax & Lewis, 1989).

Cyanide causes flushing, nausea, vomiting, palpitations, rapid heartbeat and breathing, headache, dizziness, confusion, hyperventilation, anxiety, agitation, tremors, weakness, respiratory depression, noncardiogenic pulmonary edema, cardiac arrhythmias and conduction defects, hypertension, hypotension, lactic acidosis, stupor, seizures, and coma (Hall & Rumack, 1986). Death may occur within a few minutes.

Cyanide can also have delayed neurological effects following acute exposure. Progressive damage to the optic nerve has been produced in rats within 48 hours after a single injection of sodium cyanide (Lessell & Kuwabara, 1974). A Parkinsonian-like syndrome or encephalopathy has occurred up to several weeks after acute cyanide exposure (Rosenberg et al, 1989; Yen et al, 1995; Uitti et al, 1985; Carella et al, 1988; Grandas et al, 1989; Feldman & Feldman, 1990; Rosenow et al, 1995; Borgohain et al, 1995). CNS symptoms may be reversible up to a point (Wuthrich, 1954), but some symptoms can persist for many months following exposure (Pettigrew, 1977).

CHRONIC CLINICAL EFFECTS

At the time of this review, no studies were found on chronic exposure to potassium silver cyanide in humans or experimental animals.

Chronic occupational cyanide exposure has been associated with a variety of skin and mucous membrane irritant complaints, usually attributed to exposure to highly alkaline cyanide salt aerosols or solutions (Finkel, 1983; Hartung, 1982; Proctor et al, 1988).

True chronic cyanide toxicity in humans is rare (Proctor et al, 1988), although a variety of complaints including goiter, subclinical thyroid function, B12, and folate abnormalities, headaches, vertigo, chest discomfort, palpitations, eye and respiratory irritation, dermatitis, fatigue, poor appetite and sleeping, and epistaxis have been reported in cyanide-exposed workers (Proctor et al, 1998; (Colle, 1972; Saia et al, 1970; Ermans et al, 1972; Blanc et al, 1985).

Chronic exposure to cyanides has been reported to cause CNS effects, such as insomnia, loss of memory, and tremors (Chaumont, 1960). Experimental animal studies have confirmed the central nervous system as a target for the chronic toxicity of cyanide. Rats fed cyanide for 11 months suffered damage to the spinal cord (Philbrick, 1979). Other neurological effects include degeneration of the optic nerve, resulting in blindness.

In rats, cyanide metabolites may accumulate over long periods of chronic exposure (Tewe & Maner, 1981).

-MEDICAL TREATMENT

LIFE SUPPORT

Support respiratory and cardiovascular function.

SUMMARY

FIRST AID - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

Move victim to fresh air.
Call 911 or emergency medical service.
Give artificial respiration if victim is not breathing.
Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device.
Administer oxygen if breathing is difficult.
Remove and isolate contaminated clothing and shoes.
In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes.
For minor skin contact, avoid spreading material on unaffected skin.
Keep victim warm and quiet.
Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed.
Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves.

FIRST AID

CYANIDE POISONING

The treatment of potassium silver cyanide poisoning is essentially that for cyanide intoxication.
Establish respiration; avoid mouth-to-mouth resuscitation if possible during CPR to prevent self-poisoning. Immediately begin therapy with 100% oxygen. Be prepared for endotracheal intubation if necessary.
Rescuers must not enter areas with potential high airborne concentrations of this agent without self-contained breathing apparatus (SCBA) to avoid becoming secondary victims. Avoid direct dermal contact with cyanide contaminated patient or gastric contents.
Administer 100% oxygen: Establish secure large-bore IV.
A cyanide antidote, either hydroxocobalamin OR the sodium nitrite/sodium thiosulfate kit, should be administered to patients with symptomatic poisoning.
HYDROXOCOBALAMIN: ADULT DOSE: 5 g (two 2.5 g vials each reconstituted with 100 mL sterile 0.9% saline) administered as an intravenous infusion over 15 minutes. For severe poisoning, a second dose of 5 g may be infused intravenously over 15 minutes to 2 hours, depending on the patient's condition. CHILDREN: Limited experience; a dose of 70 mg/kg has been used in pediatric patients.
The Cyanide Antidote Kit is administered as follows:

SODIUM NITRITE: Adult: 10 mL (300 mg) of a 3% solution IV at a rate of 2.5 to 5 mL/minute; Child (with normal hemoglobin concentration): 0.2 mL/kg (6 mg/kg) of a 3% solution IV at a rate of 2.5 to 5 mL/minute, not to exceed 10 mL (300 mg).
Repeat one-half of initial sodium nitrite dose one-half hour later if there is inadequate clinical response. Calculate pediatric doses precisely to avoid potentially life-threatening methemoglobinemia. Use with caution if carbon monoxide poisoning is also suspected. Monitor blood pressure carefully. Reduce nitrite administration rate if hypotension occurs.
SODIUM THIOSULFATE: Administer sodium thiosulfate IV immediately following sodium nitrite. DOSE: ADULT: 50 mL (12.5 g) of a 25% solution; CHILD: 1 mL/kg (250 mg/kg) of a 25% solution, not to exceed 50 mL (12.5 g) total dose. A second dose, one-half of the first dose, may be administered if signs of cyanide toxicity reappear.

SODIUM BICARBONATE: Administer 1 mEq/kg IV to acidotic patients.
SEIZURES: Administer a benzodiazepine; DIAZEPAM (ADULT: 5 to 10 mg IV initially; repeat every 5 to 20 minutes as needed. CHILD: 0.1 to 0.5 mg/kg IV over 2 to 5 minutes; up to a maximum of 10 mg/dose. May repeat dose every 5 to 10 minutes as needed) or LORAZEPAM (ADULT: 2 to 4 mg IV initially; repeat every 5 to 10 minutes as needed, if seizures persist. CHILD: 0.05 to 0.1 mg/kg IV over 2 to 5 minutes, up to a maximum of 4 mg/dose; may repeat in 5 to 15 minutes as needed, if seizures continue).

Consider phenobarbital or propofol if seizures recur after diazepam 30 mg (adults) or 10 mg (children greater than 5 years).
Monitor for hypotension, dysrhythmias, respiratory depression, and need for endotracheal intubation. Evaluate for hypoglycemia, electrolyte disturbances, and hypoxia.

METHEMOGLOBINEMIA: Methylene or toluidine blue treatment may be considered if excessive methemoglobinemia occurs due to nitrite administration. Consider exchange transfusion for severe symptoms of excessive methemoglobinemia.
HYPERBARIC OXYGEN AND HEMODIALYSIS: May be useful in severe cases not responsive to supportive and antidotal therapy.
ACUTE LUNG INJURY: Maintain ventilation and oxygenation and evaluate with frequent arterial blood gases and/or pulse oximetry monitoring. Early use of PEEP and mechanical ventilation may be needed.
HYPOTENSION: Infuse 10 to 20 mL/kg isotonic fluid. If hypotension persists, administer dopamine (5 to 20 mcg/kg/min) or norepinephrine (ADULT: begin infusion at 0.5 to 1 mcg/min; CHILD: begin infusion at 0.1 mcg/kg/min); titrate to desired response.
ALTERNATE ANTIDOTES

Dicobalt-EDTA (Kelocyanor(R)) and 4-DMAP (4-dimethylaminophenol) are alternate cyanide antidotes in clinical use in various countries outside the USA.

INHALATION EXPOSURE

INHALATION: Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with an inhaled beta2-adrenergic agonist. Consider systemic corticosteroids in patients with significant bronchospasm.
ACUTE LUNG INJURY: Maintain ventilation and oxygenation and evaluate with frequent arterial blood gases and/or pulse oximetry monitoring. Early use of PEEP and mechanical ventilation may be needed.

DERMAL EXPOSURE

DECONTAMINATION: Remove contaminated clothing and jewelry and place them in plastic bags. Wash exposed areas with soap and water for 10 to 15 minutes with gentle sponging to avoid skin breakdown. A physician may need to examine the area if irritation or pain persists (Burgess et al, 1999).
Some chemicals can produce systemic poisoning by absorption through intact skin. Carefully observe patients with dermal exposure for the development of any systemic signs or symptoms and administer symptomatic treatment as necessary.

EYE EXPOSURE

DECONTAMINATION: Remove contact lenses and irrigate exposed eyes with copious amounts of room temperature 0.9% saline or water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist after 15 minutes of irrigation, the patient should be seen in a healthcare facility.

ORAL/PARENTERAL EXPOSURE

In symptomatic patients, skip these steps until other major emergency measures including use of Cyanide Antidote Kit and other life support measures have been instituted.

Perform gastric lavage with a large bore tube after endotracheal intubation.
GASTRIC LAVAGE: Consider after ingestion of a potentially life-threatening amount of poison if it can be performed soon after ingestion (generally within 1 hour). Protect airway by placement in the head down left lateral decubitus position or by endotracheal intubation. Control any seizures first.

CONTRAINDICATIONS: Loss of airway protective reflexes or decreased level of consciousness in unintubated patients; following ingestion of corrosives; hydrocarbons (high aspiration potential); patients at risk of hemorrhage or gastrointestinal perforation; and trivial or non-toxic ingestion.

ACTIVATED CHARCOAL: Administer charcoal as a slurry (240 mL water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents, 25 to 50 g in children (1 to 12 years), and 1 g/kg in infants less than 1 year old.

Administer 100% oxygen. Establish secure large bore IV.
A cyanide antidote, either hydroxocobalamin OR the sodium nitrite/sodium thiosulfate kit, should be administered to patients with symptomatic poisoning.
HYDROXOCOBALAMIN: ADULT DOSE: 5 g (two 2.5 g vials each reconstituted with 100 mL sterile 0.9% saline) administered as an intravenous infusion over 15 minutes. For severe poisoning, a second dose of 5 g may be infused intravenously over 15 minutes to 2 hours, depending on the patient's condition. CHILDREN: Limited experience; a dose of 70 mg/kg has been used in pediatric patients.
The Cyanide Antidote Kit is administered as follows:

SODIUM NITRITE: Adult: 10 mL (300 mg) of a 3% solution IV at a rate of 2.5 to 5 mL/minute; Child (with normal hemoglobin concentration): 0.2 mL/kg (6 mg/kg) of a 3% solution IV at a rate of 2.5 to 5 mL/minute, not to exceed 10 mL (300 mg).
Repeat one-half of initial sodium nitrite dose one-half hour later if there is inadequate clinical response. Calculate pediatric doses precisely to avoid potentially life-threatening methemoglobinemia. Use with caution if carbon monoxide poisoning is also suspected. Monitor blood pressure carefully. Reduce nitrite administration rate if hypotension occurs.
SODIUM THIOSULFATE: Administer sodium thiosulfate IV immediately following sodium nitrite. DOSE: ADULT: 50 mL (12.5 g) of a 25% solution; CHILD: 1 mL/kg (250 mg/kg) of a 25% solution, not to exceed 50 mL (12.5 g) total dose. A second dose, one-half of the first dose, may be administered if signs of cyanide toxicity reappear.

SODIUM BICARBONATE: Administer 1 mEq/kg IV to acidotic patients.
SEIZURES: Administer a benzodiazepine; DIAZEPAM (ADULT: 5 to 10 mg IV initially; repeat every 5 to 20 minutes as needed. CHILD: 0.1 to 0.5 mg/kg IV over 2 to 5 minutes; up to a maximum of 10 mg/dose. May repeat dose every 5 to 10 minutes as needed) or LORAZEPAM (ADULT: 2 to 4 mg IV initially; repeat every 5 to 10 minutes as needed, if seizures persist. CHILD: 0.05 to 0.1 mg/kg IV over 2 to 5 minutes, up to a maximum of 4 mg/dose; may repeat in 5 to 15 minutes as needed, if seizures continue).

Consider phenobarbital or propofol if seizures recur after diazepam 30 mg (adults) or 10 mg (children greater than 5 years).
Monitor for hypotension, dysrhythmias, respiratory depression, and need for endotracheal intubation. Evaluate for hypoglycemia, electrolyte disturbances, and hypoxia.

ACUTE LUNG INJURY: Maintain ventilation and oxygenation and evaluate with frequent arterial blood gases and/or pulse oximetry monitoring. Early use of PEEP and mechanical ventilation may be needed.
HYPOTENSION: Infuse 10 to 20 mL/kg isotonic fluid. If hypotension persists, administer dopamine (5 to 20 mcg/kg/min) or norepinephrine (ADULT: begin infusion at 0.5 to 1 mcg/min; CHILD: begin infusion at 0.1 mcg/kg/min); titrate to desired response.
HYPERBARIC OXYGEN AND HEMODIALYSIS: May be useful in severe cases not responsive to supportive and antidotal therapy.
If respiratory tract irritation or respiratory depression is evident, monitor arterial blood gases, chest x-ray, and pulmonary function tests.
Whole blood cyanide levels may be obtained to document the poisoning and response to treatment.
METHEMOGLOBINEMIA: Methylene or toluidine blue treatment may be considered if excessive methemoglobinemia occurs due to nitrite administration. Consider exchange transfusion for severe symptoms of excessive methemoglobinemia.
ALTERNATE ANTIDOTES: Kelocyanor(R) (dicobalt-EDTA) and 4-DMAP (4-dimethylaminophenol) are alternate cyanide antidotes in clinical use in various countries outside the USA. See Treatment Sections in the Cyanide Meditext(R) Medical Management for more information.

-RANGE OF TOXICITY

MINIMUM LETHAL EXPOSURE

ACUTE

The fatal dose of cyanide salts is estimated at 200 to 300 milligrams for an adult (Bonnichsen & Maely, 1966; Baselt & Cravey, 1989).

ROUTE OF EXPOSURE

Inhalation of air concentrations of 0.2 to 0.3 milligrams per liter (200 to 300 parts per million) is rapidly fatal (ACGIH, 1986).

MAXIMUM TOLERATED EXPOSURE

ROUTE OF EXPOSURE

Patients have survived exposure to air concentrations of 500 milligrams per cubic meter (Bonsall, 1984), ingestions of one gram of potassium cyanide (Yacoub et al, 1974; Hall & Rumack, 1987), and complete immersion in solutions of cyanide salts (Bismuth et al, 1984; Dodds & McKnight, 1985).

Carcinogenicity Ratings for CAS506-61-6 :

ACGIH (American Conference of Governmental Industrial Hygienists, 2010): Not Listed
EPA (U.S. Environmental Protection Agency, 2011): Not Assessed under the IRIS program. ; Listed as: Potassium silver cyanide
IARC (International Agency for Research on Cancer (IARC), 2016; International Agency for Research on Cancer, 2015; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2010; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2010a; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2008; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2007; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2006; IARC, 2004): Not Listed
NIOSH (National Institute for Occupational Safety and Health, 2007): Not Listed
MAK (DFG, 2002): Not Listed
NTP (U.S. Department of Health and Human Services, Public Health Service, National Toxicology Project ): Not Listed

TOXICITY AND RISK ASSESSMENT VALUES

EPA IRIS

EPA Risk Assessment Values for CAS506-61-6 (U.S. Environmental Protection Agency, 2011):

Oral:

Slope Factor:
RfD: 5x10(-3) mg/kg-day

Inhalation:

Unit Risk: Not Assessed under the IRIS Program.
RfC: Not Assessed under the IRIS Program.

Drinking Water:

Unit Risk:

TOXICITY VALUES

Reference: RTECS, 1998
- LD50- (ORAL)RAT:

-STANDARDS AND LABELS

WORKPLACE STANDARDS

ACGIH TLV Values for CAS506-61-6 (American Conference of Governmental Industrial Hygienists, 2010):

Not Listed

AIHA WEEL Values for CAS506-61-6 (AIHA, 2006):

Not Listed

NIOSH REL and IDLH Values for CAS506-61-6 (National Institute for Occupational Safety and Health, 2007):

Not Listed

OSHA PEL Values for CAS506-61-6 (U.S. Occupational Safety, and Health Administration (OSHA), 2010):

Not Listed

OSHA List of Highly Hazardous Chemicals, Toxics, and Reactives for CAS506-61-6 (U.S. Occupational Safety and Health Administration, 2010):

Not Listed

ENVIRONMENTAL STANDARDS

EPA CERCLA, Hazardous Substances and Reportable Quantities for CAS506-61-6 (U.S. Environmental Protection Agency, 2010):

Listed as: Potassium silver cyanide
Final Reportable Quantity, in pounds (kilograms):

1 (0.454)

Additional Information:
Listed as: Argentate(1-), bis(cyano-C)-, potassium
Final Reportable Quantity, in pounds (kilograms):

1 (0.454)

Additional Information:

EPA CERCLA, Hazardous Substances and Reportable Quantities, Radionuclides for CAS506-61-6 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA RCRA Hazardous Waste Number for CAS506-61-6 (U.S. Environmental Protection Agency, 2010b):

Listed as: Argentate(1-), bis(cyano-C)-, potassium
P or U series number: P099
Footnote:
Listed as: Potassium silver cyanide
P or U series number: P099
Footnote:
Editor's Note: The D, F, and K series waste numbers and Appendix VIII to Part 261 -- Hazardous Constituents were not included. Please refer to 40 CFR Part 261.

EPA SARA Title III, Extremely Hazardous Substance List for CAS506-61-6 (U.S. Environmental Protection Agency, 2010):

Listed as: Potassium Silver Cyanide
Reportable Quantity, in pounds: 1

Only the statutory or final RQ is shown. For more information, see 40 CFR table 302.4.

Threshold Planning Quantity, in pounds:

500
Amount necessary to be covered by this standard. See 40 CFR 355.30.

Note(s): a

a: This material is a reactive solid. The TPQ does not default to 10,000 pounds for non-powder, non-molten, non-solution form.

EPA SARA Title III, Community Right-to-Know for CAS506-61-6 (40 CFR 372.65, 2006; 40 CFR 372.28, 2006):

Not Listed

DOT List of Marine Pollutants for CAS506-61-6 (49 CFR 172.101 - App. B, 2005):

Not Listed

EPA TSCA Inventory for CAS506-61-6 (EPA, 2005):

Listed as: Argentate(1-), bis(cyano-.kappa.C)-, potassium

SHIPPING REGULATIONS

SURFACE

DOT -- Table of Hazardous Materials and Special Provisions (49 CFR 172.101, 2005):

Not Listed

ICAO International Shipping Name (ICAO, 2002):

Not Listed

LABELS

NFPA

NFPA Hazard Ratings for CAS506-61-6 (NFPA, 2002):

Not Listed

-PERSONAL PROTECTION

SUMMARY

RECOMMENDED PROTECTIVE CLOTHING - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

Wear positive pressure self-contained breathing apparatus (SCBA).
Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection.
Structural firefighters' protective clothing provides limited protection in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible.

RESPIRATORY PROTECTION

Refer to "Recommendations for respirator selection" in the NIOSH Pocket Guide to Chemical Hazards on TOMES Plus(R) for respirator information.

PROTECTIVE CLOTHING

CHEMICAL PROTECTIVE CLOTHING. Search results for CAS 506-61-6.

Specific recommendations and test data for this chemical were not found in the available manufacturers' product literature. A complete list of consulted manufacturers and references is presented below.

-PHYSICAL HAZARDS

FIRE HAZARD

SUMMARY

Editor's Note: This material is not listed in the Emergency Response Guidebook. Based on the material's physical and chemical properties, toxicity, or chemical group, a guide has been assigned. For additional technical information, contact one of the emergency response telephone numbers listed under Public Safety Measures.
POTENTIAL FIRE OR EXPLOSION HAZARDS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
- Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars etc.).
- Substance will react with water (some violently), releasing corrosive and/or toxic gases.
- Contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
When heated to decomposition, potassium silver cyanide emits very toxic fumes of cyanide and nitrogen oxides.

FLAMMABILITY CLASSIFICATION

NFPA Flammability Rating for CAS506-61-6 (NFPA, 2002):

Not Listed

FIRE CONTROL/EXTINGUISHING AGENTS

FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

Note: Most foams will react with the material and release corrosive/toxic gases.

SMALL FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

CO2 (except for Cyanides), dry chemical, dry sand, alcohol-resistant foam.

LARGE FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

Water spray, fog or alcohol-resistant foam.
Move containers from fire area if you can do it without risk.
Use water spray or fog; do not use straight streams.
Dike fire control water for later disposal; do not scatter the material.

TANK OR CAR/TRAILER LOAD FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

Fight fire from maximum distance or use unmanned hose holders or monitor nozzles.
Do not get water inside containers.
Cool containers with flooding quantities of water until well after fire is out.
Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank.
ALWAYS stay away from tanks engulfed in fire.

NFPA Extinguishing Methods for CAS506-61-6 (NFPA, 2002):

Not Listed

COMBUSTION TOXICITY

When heated to decomposition, potassium silver cyanide emits very toxic fumes of cyanide and nitrogen oxides (EPA, 1985).

DUST/VAPOR HAZARD

Fire may produce irritating or poisonous gases (EPA, 1985).

REACTIVITY HAZARD

Potassium silver cyanide is sensitive to light (Budavari, 1996).

EVACUATION PROCEDURES

SUMMARY

Editor's Note: This material is not listed in the Table of Initial Isolation and Protective Action Distances.

SPILL - PUBLIC SAFETY EVACUATION DISTANCES - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

Increase, in the downwind direction, as necessary, the isolation distance of at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids in all directions.

FIRE - PUBLIC SAFETY EVACUATION DISTANCES - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions.

PUBLIC SAFETY MEASURES - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)

CALL Emergency Response Telephone Number on Shipping Paper first. If Shipping Paper not available or no answer, refer to appropriate telephone number:

MEXICO:

SETIQ:

01-800-00-214-00 in the Mexican Republic;
For calls originating in Mexico City and the Metropolitan Area: 5559-1588;
For calls originating elsewhere, call: 011-52-555-559-1588.

CENACOM:

01-800-00-413-00 in the Mexican Republic;
For calls originating in Mexico City and the Metropolitan Area: 5550-1496, 5550-1552, 5550-1485, or 5550-4885;
For calls originating elsewhere, call: 011-52-555-550-1496, or 011-52-555-550-1552; 011-52-555-550-1485, or 011-52-555-550-4885.

ARGENTINA:

CIQUIME:

0-800-222-2933 in the Republic of Argentina;
For calls originating elsewhere, call: +54-11-4613-1100.

BRAZIL:

PRÓ-QUÍMICA:

0-800-118270 (Toll-free in Brazil);
For calls originating elsewhere, call: +55-11-232-1144 (Collect calls are accepted).

COLUMBIA:

CISPROQUIM:

01-800-091-6012 in Colombia;
For calls originating in Bogotá, Colombia, call: 288-6012;
For calls originating elsewhere, call: 011-57-1-288-6012.

CANADA:

CANUTEC:

613-996-6666 (Collect calls are accepted);
*666 cellular (in Canada only).

UNITED STATES:

CHEMTREC®:

1-800-424-9300 (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
703-527-3887 for calls originating elsewhere (Collect calls are accepted).

CHEM-TEL, INC.:

1-800-255-3924 (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
813-248-0585 for calls originating elsewhere (Collect calls are accepted).

INFOTRAC:

1-800-535-5053 (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
352-323-3500 for calls originating elsewhere (Collect calls are accepted).

3E COMPANY:

1-800-451-8346 (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
760-602-8703 for calls originating elsewhere (Collect calls are accepted).

NATIONAL RESPONSE CENTER (NRC):

1-800-424-8802 - (24 hours) (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
202-267-2675 for calls in the District of Columbia.

MILITARY SHIPMENTS:

703-697-0218 - Explosives/ammunition incidents (Collect calls are accepted);
1-800-851-8061 - All other dangerous goods incidents.

NATIONWIDE POISON CONTROL CENTER (United States only):

1-800-222-1222 (Toll-free in the U.S.).

For additional details see the section entitled "WHO TO CALL FOR ASSISTANCE" under the ERG Instructions.
As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.
Keep unauthorized personnel away.
Stay upwind.
Keep out of low areas.
Ventilate enclosed areas.

AIHA ERPG Values for CAS506-61-6 (AIHA, 2006):

Not Listed

DOE TEEL Values for CAS506-61-6 (U.S. Department of Energy, Office of Emergency Management, 2010):

Listed as Potassium silver cyanide
TEEL-0 (units = mg/m3): 0.0184
TEEL-1 (units = mg/m3): 2.5
TEEL-2 (units = mg/m3): 18.4
TEEL-3 (units = mg/m3): 18.4
Definitions:

TEEL-0: The threshold concentration below which most people will experience no adverse health effects.
TEEL-1: The airborne concentration (expressed as ppm [parts per million] or mg/m(3) [milligrams per cubic meter]) of a substance above which it is predicted that the general population, including susceptible individuals, could experience notable discomfort, irritation, or certain asymptomatic, nonsensory effects. However, these effects are not disabling and are transient and reversible upon cessation of exposure.
TEEL-2: The airborne concentration (expressed as ppm or mg/m(3)) of a substance above which it is predicted that the general population, including susceptible individuals, could experience irreversible or other serious, long-lasting, adverse health effects or an impaired ability to escape.
TEEL-3: The airborne concentration (expressed as ppm or mg/m(3)) of a substance above which it is predicted that the general population, including susceptible individuals, could experience life-threatening adverse health effects or death.

AEGL Values for CAS506-61-6 (National Research Council, 2010; National Research Council, 2009; National Research Council, 2008; National Research Council, 2007; NRC, 2001; NRC, 2002; NRC, 2003; NRC, 2004; NRC, 2004; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; United States Environmental Protection Agency Office of Pollution Prevention and Toxics, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; 62 FR 58840, 1997; 65 FR 14186, 2000; 65 FR 39264, 2000; 65 FR 77866, 2000; 66 FR 21940, 2001; 67 FR 7164, 2002; 68 FR 42710, 2003; 69 FR 54144, 2004):

Not Listed

NIOSH IDLH Values for CAS506-61-6 (National Institute for Occupational Safety and Health, 2007):

Not Listed

CONTAINMENT/WASTE TREATMENT OPTIONS

SUMMARY

SPILL OR LEAK PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)
- ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area).
- All equipment used when handling the product must be grounded.
- Do not touch damaged containers or spilled material unless wearing appropriate protective clothing.
- Stop leak if you can do it without risk.
- A vapor suppressing foam may be used to reduce vapors.
- DO NOT GET WATER INSIDE CONTAINERS.
- Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material.
- Prevent entry into waterways, sewers, basements or confined areas.
RECOMMENDED PROTECTIVE CLOTHING - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)
- Wear positive pressure self-contained breathing apparatus (SCBA).
- Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection.
- Structural firefighters' protective clothing provides limited protection in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible.

SMALL LEAK/SPILL

SMALL SPILL PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 157 (ERG, 2004)
- Cover with DRY earth, DRY sand, or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain.
- Use clean non-sparking tools to collect material and place it into loosely covered plastic containers for later disposal.

-ENVIRONMENTAL HAZARD MANAGEMENT

POLLUTION HAZARD

There was no information on pollution hazards for potassium silver cyanide in available references at the time of this review.

ENVIRONMENTAL FATE AND KINETICS

OTHER

OTHER
- There was no information on environmental kinetics for potassium silver cyanide in available references at the time of this review.

ENVIRONMENTAL TOXICITY

There was no information on environmental toxicity for potassium silver cyanide in available references at the time of this review.

EPA has estimated that most saltwater aquatic organisms and their uses should not be threatened if the one-hour average cyanide concentration does not exceed 1.0 microgram/liter more than once every three years (on the average) (HSDB , 1990).

EPA CYANIDE DESIGNATIONS (Sittig, 1985)

Hazardous Substance
Hazardous Waste Constituent
Priority Toxic Pollutant

PERMISSIBLE CYANIDE WATER CONCENTRATIONS (Sittig, 1985)

To protect freshwater aquatic life: 3.5 micrograms/liter (24-hour average); never to exceed 52 micrograms/liter
To protect saltwater aquatic life: 30.0 micrograms/liter (acute toxicity basis); 2.0 micrograms/liter (chronic toxicity basis)
To protect human health: 200 micrograms/liter
Allowable human daily intake: 8.4 milligrams/day
WHO drinking water standard: 50 micrograms/liter

Bottled drinking water may not contain in excess of 0.05 milligrams/liter silver (HSDB , 1990).

-PHYSICAL/CHEMICAL PROPERTIES

MOLECULAR WEIGHT

199.01 (Budavari, 1996)

DESCRIPTION/PHYSICAL STATE

Potassium silver cyanide is a white crystalline solid. There was no information on its odor or taste in available references at the time of this review (Sittig, 1991).

No information found at the time of this review.

DENSITY

NORMAL TEMPERATURE AND PRESSURE

(25 degrees C; 77 degrees F and 760 mmHg)
2.36 g/m(3) (WATER = 1) (EPA, 1985)

SOLUBILITY

IN WATER

Potassium silver cyanide is soluble in water (Lewis, 1996).

IN ORGANIC SOLVENTS

Soluble in alcohol (Lewis, 1993).

-REFERENCES

GENERAL BIBLIOGRAPHY

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62 FR 58840: Notice of the National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances - Proposed AEGL Values, Environmental Protection Agency, NAC/AEGL Committee. National Archives and Records Administration (NARA) and the Government Publishing Office (GPO), Washington, DC, 1997.

65 FR 14186: Notice of the National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances - Proposed AEGL Values, Environmental Protection Agency, NAC/AEGL Committee. National Archives and Records Administration (NARA) and the Government Publishing Office (GPO), Washington, DC, 2000.

65 FR 39264: Notice of the National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances - Proposed AEGL Values, Environmental Protection Agency, NAC/AEGL Committee. National Archives and Records Administration (NARA) and the Government Publishing Office (GPO), Washington, DC, 2000.

65 FR 77866: Notice of the National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances - Proposed AEGL Values, Environmental Protection Agency, NAC/AEGL Committee. National Archives and Records Administration (NARA) and the Government Publishing Office (GPO), Washington, DC, 2000.

66 FR 21940: Notice of the National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances - Proposed AEGL Values, Environmental Protection Agency, NAC/AEGL Committee. National Archives and Records Administration (NARA) and the Government Publishing Office (GPO), Washington, DC, 2001.

67 FR 7164: Notice of the National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances - Proposed AEGL Values, Environmental Protection Agency, NAC/AEGL Committee. National Archives and Records Administration (NARA) and the Government Publishing Office (GPO), Washington, DC, 2002.

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POTASSIUM SILVER CYANIDE

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Information to evaluate chemical incidents