SODIUM THIOSULFATE

Sodium thiosulfate is an inorganic reducing agent used as a fixative, chrome tanning agent, dechlorinating agent, in silver extraction from ores, and in bleaching of bone, straw and ivory.
It is also used as a reducing agent for chrome dying, in manufacture of leather, a mordant in dyeing and printing textiles, and in a variety of pharmaceutical and veterinary preparations (ITI, 1985; Budavari, 1996; HSDB , 2000)
For decontaminating fish bowls, the concentration of sodium thiosulfate is less than 1% and non-toxic.
MEDICAL USES

It is part of the Cyanide Antidote kit (used in combination with amyl nitrite and sodium nitrite for the treatment of cyanide poisoning).
It has been recommended for use as a 10 percent ointment or solution for SELENIUM DIOXIDE burns (Finkel, 1983).
It is used in veterinary medicine to treat bloat, as a "general detoxifier," and topically to treat ringworm (Budavari, 1996; HSDB , 2000).
It has been used to prevent undesirable side effects from a variety of drugs.
Other uses have included topical treatment of tinea versicolor, tinea cruris, and other dermatophytoses. It has been used in the past as an antitubercular agent and antioxidant (HSDB , 2000).

FORMS

Sodium thiosulfate occurs in both anhydrous and the pentahydrate forms, with the pentahydrate predominating under ambient conditions (Budavari, 1996).
Thiosulfate is a normally-occurring constituent of the body and may be an intermediate metabolite of sulfur-containing amino acids. It is generally the rate-limiting substrate for the endogenous enzyme, rhodanase, in the detoxification of cyanide (Ivankovich et al, 1983).

SOURCES

Sodium thiosulfate occurs as white, transparent, almost odorless crystals or powder with a salty taste (ITI, 1985; Persson & Walter, 1987; HSDB , 2000).

-CLINICAL EFFECTS

GENERAL CLINICAL EFFECTS

ANIMAL STUDIES

Rapid intravenous infusion of large amounts has caused transient hypotension and ECG changes in dogs.
Metabolic acidosis and hypernatremia occurred in dogs given large doses.

WITH POISONING/EXPOSURE

Sodium thiosulfate is an agent with a low order of toxicity. It may be a mild irritant in the solid form. Ingestion can cause gastrointestinal disturbances. It can cause allergic dermatitis.
Ingestion of a large quantity may cause diarrhea.

Editor's Note: An ERG guide with information appropriate to this material does not exist.

-FIRST AID

FIRST AID AND PREHOSPITAL TREATMENT

ACTIVATED CHARCOAL

PREHOSPITAL ACTIVATED CHARCOAL ADMINISTRATION

Consider prehospital administration of activated charcoal as an aqueous slurry in patients with a potentially toxic ingestion who are awake and able to protect their airway. Activated charcoal is most effective when administered within one hour of ingestion. Administration in the prehospital setting has the potential to significantly decrease the time from toxin ingestion to activated charcoal administration, although it has not been shown to affect outcome (Alaspaa et al, 2005; Thakore & Murphy, 2002; Spiller & Rogers, 2002).

In patients who are at risk for the abrupt onset of seizures or mental status depression, activated charcoal should not be administered in the prehospital setting, due to the risk of aspiration in the event of spontaneous emesis.
The addition of flavoring agents (cola drinks, chocolate milk, cherry syrup) to activated charcoal improves the palatability for children and may facilitate successful administration (Guenther Skokan et al, 2001; Dagnone et al, 2002).

CHARCOAL DOSE

Use a minimum of 240 milliliters of water per 30 grams charcoal (FDA, 1985). Optimum dose not established; usual dose is 25 to 100 grams in adults and adolescents; 25 to 50 grams in children aged 1 to 12 years (or 0.5 to 1 gram/kilogram body weight) ; and 0.5 to 1 gram/kilogram in infants up to 1 year old (Chyka et al, 2005).

Routine use of a cathartic with activated charcoal is NOT recommended as there is no evidence that cathartics reduce drug absorption and cathartics are known to cause adverse effects such as nausea, vomiting, abdominal cramps, electrolyte imbalances and occasionally hypotension (None Listed, 2004).

ADVERSE EFFECTS/CONTRAINDICATIONS

Complications: emesis, aspiration (Chyka et al, 2005). Aspiration may be complicated by acute respiratory failure, ARDS, bronchiolitis obliterans or chronic lung disease (Golej et al, 2001; Graff et al, 2002; Pollack et al, 1981; Harris & Filandrinos, 1993; Elliot et al, 1989; Rau et al, 1988; Golej et al, 2001; Graff et al, 2002). Refer to the ACTIVATED CHARCOAL/TREATMENT management for further information.
Contraindications: unprotected airway (increases risk/severity of aspiration) , nonfunctioning gastrointestinal tract, uncontrolled vomiting, and ingestion of most hydrocarbons (Chyka et al, 2005).

-RANGE OF TOXICITY

MINIMUM LETHAL EXPOSURE

GENERAL/SUMMARY

The minimum lethal human dose to this agent has not been delineated.

ANIMAL DATA

The lowest published lethal subcutaneous dose for a rabbit is 4 grams/kilogram (RTECS , 2000).
The lowest published lethal subcutaneous dose for a frog is 6 grams/kilogram (RTECS , 2000).

MAXIMUM TOLERATED EXPOSURE

ACUTE

Ingestion of 12 grams of sodium thiosulfate was virtually non-toxic except for producing violent catharsis. Large doses are expected to have a cathartic action (Reynolds, 2000).
The lowest toxic intravenous doses in humans were 0.2 to 1.5 grams/kilogram (ITI, 1985).
9.9 grams/square meter given intravenously to counteract the nephrotoxicity of cisplatin had no apparent ill effects (Pfeifle et al, 1985).

Carcinogenicity Ratings for CAS7772-98-7 :

ACGIH (American Conference of Governmental Industrial Hygienists, 2010): Not Listed
EPA (U.S. Environmental Protection Agency, 2011): Not Listed
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 CAS7772-98-7 (U.S. Environmental Protection Agency, 2011):

Not Listed

TOXICITY VALUES

LD50- (INTRAPERITONEAL)MOUSE:
- 5200 mg/kg (RTECS, 2000)
LD50- (INTRAVENOUS)RAT:
- > 2.5 g/kg (RTECS, 2000)
LDLo- (SUBCUTANEOUS)RABBIT:
- 4 g/kg (RTECS, 2000)

-STANDARDS AND LABELS

WORKPLACE STANDARDS

ACGIH TLV Values for CAS7772-98-7 (American Conference of Governmental Industrial Hygienists, 2010):

Not Listed

AIHA WEEL Values for CAS7772-98-7 (AIHA, 2006):

Not Listed

NIOSH REL and IDLH Values for CAS7772-98-7 (National Institute for Occupational Safety and Health, 2007):

Not Listed

OSHA PEL Values for CAS7772-98-7 (U.S. Occupational Safety, and Health Administration (OSHA), 2010):

Not Listed

OSHA List of Highly Hazardous Chemicals, Toxics, and Reactives for CAS7772-98-7 (U.S. Occupational Safety and Health Administration, 2010):

Not Listed

ENVIRONMENTAL STANDARDS

EPA CERCLA, Hazardous Substances and Reportable Quantities for CAS7772-98-7 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA CERCLA, Hazardous Substances and Reportable Quantities, Radionuclides for CAS7772-98-7 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA RCRA Hazardous Waste Number for CAS7772-98-7 (U.S. Environmental Protection Agency, 2010b):

Not Listed
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 CAS7772-98-7 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA SARA Title III, Community Right-to-Know for CAS7772-98-7 (40 CFR 372.65, 2006; 40 CFR 372.28, 2006):

Not Listed

DOT List of Marine Pollutants for CAS7772-98-7 (49 CFR 172.101 - App. B, 2005):

Not Listed

EPA TSCA Inventory for CAS7772-98-7 (EPA, 2005):

Listed as: Thiosulfuric acid (H2S2O3), disodium salt

LABELS

NFPA

NFPA Hazard Ratings for CAS7772-98-7 (NFPA, 2002):

Not Listed

-PERSONAL PROTECTION

SUMMARY

Editor's Note: An ERG guide with information appropriate to this material does not exist.

PROTECTIVE CLOTHING

CHEMICAL PROTECTIVE CLOTHING. Search results for CAS 7772-98-7.

All data are compiled from published sources and are NOT recommended specifically by Truven Health Analytics. The appearance of specific manufacturers or products in this section does not represent an endorsement by Truven Health Analytics. No attempt has been made to verify the data presented. All product recommendations should be confirmed with the specific manufacturer for verification of product performance.
CLOTHING

Specific recommendations and test data for this product type were not found in the available manufacturers' product literature.

FOOTWEAR

Specific recommendations and test data for this product type were not found in the available manufacturers' product literature.

GLOVES

Natural Rubber

Comasec Safety, Inc

Astro-Flex

Degradation Rating: Not Listed
Breakthrough Time (minutes): 360
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution
Citation: (Comasec Safety, Inc., 2003a)

Black Max

Degradation Rating: Not Listed
Breakthrough Time (minutes): 480
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution
Citation: (Comasec Safety, Inc., 2003a)

Jelly Fish

Degradation Rating: Not Listed
Breakthrough Time (minutes): 360
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution
Citation: (Comasec Safety, Inc., 2003a)

Neoprene

Comasec Safety, Inc

Astro-Prene

Degradation Rating: Not Listed
Breakthrough Time (minutes): 360
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution
Citation: (Comasec Safety, Inc., 2003a)

MAPA Spontex, Inc.

Stanzoil/NL-34

Degradation Rating: Excellent
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): None Detected
Notes: 41.20%
Citation: (MAPA Professional, 2004)

Polyvinyl Chloride

Comasec Safety, Inc

Blockbuster LP

Degradation Rating: Not Listed
Breakthrough Time (minutes): 480
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution
Citation: (Comasec Safety, Inc., 2003a)

Lion Paw

Degradation Rating: Not Listed
Breakthrough Time (minutes): 480
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution
Citation: (Comasec Safety, Inc., 2003a)

Presti

Degradation Rating: Not Listed
Breakthrough Time (minutes): 480
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution
Citation: (Comasec Safety, Inc., 2003a)

Yellow Jacket

Degradation Rating: Not Listed
Breakthrough Time (minutes): 480
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution
Citation: (Comasec Safety, Inc., 2003a)

Yellow Submarine

Degradation Rating: Not Listed
Breakthrough Time (minutes): 480
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution
Citation: (Comasec Safety, Inc., 2003a)

Polyvinyl Chloride/Nitrile

Comasec Safety, Inc

Multi+plus

Degradation Rating: Not Listed
Breakthrough Time (minutes): 480
Permeation Rate (mcg/cm2/min): 0
Notes: saturated solution, tested in accordance with ASTM F739
Citation: (Comasec Safety, Inc., 2003a)

GENERAL INFORMATION

This section provides a compilation of chemical resistance information and test data for specific protective clothing products. Chemical resistance information includes both degradation resistance ratings and permeation resistance data. This information is designed to assist in the selection of appropriate protective clothing. Only data on specific products and manufacturers are included. Generic information or recommendations are not provided since significant differences can exist in the chemical resistance for apparent similar product types.
Specific product information is organized by general product type (gloves, garments, and footwear), material type, and manufacturer. The category 'garments' may include totally encapsulating suits, splash suits, as well as other items (e.g., coveralls, jackets, and aprons). Specific manufacturers should be contacted to determine the features of available styles/models.
In addition to chemical resistance information, there are many critical variables in the selection of protective clothing which cannot be represented in this summary of the literature. Some factors to be considered in choosing protective clothing include, but are not limited to: overall clothing integrity, physical hazard resistance, durability, human factors, ease of decontamination, and cost. Overall clothing integrity refers to a specific design's ability to offer consistent protection for all clothing-covered areas of the body. Physical hazards include resisting the effects of abrasion, cuts, tears, and punctures. Human factors entail effects on wearer mobility, visibility, and hearing for garments; dexterity, tactility, and grip for gloves; ankle support and weight for footwear; and, any effect of the clothing on the function of the wearer. There are several variations in the design for gloves, garments, and footwear that affect these factors. Protective clothing must properly be sized and correctly fit the wearer to ensure its proper use and function.
As required in the U.S.A., protective clothing should be selected based on a risk assessment of the workplace. This risk assessment must account for the identification of existing as well as potential hazards and involve the recommendation of protective clothing appropriate for the identified hazards. Therefore, the recommendations in this section should not be used as the sole basis for decisions on choice of protective clothing, but rather should be used as a tool by qualified occupational health and safety professionals or other technically qualified persons in conjunction with a review of all mitigating factors. Consult the OSHA PPE Standard (29 CFR 1910.132 - 1910.138) for regulations and additional guidance regarding the selection and use of protective clothing and equipment. For general information on protective clothing selection, refer to the "PERSONAL PROTECTIVE EQUIPMENT - OSHA PUB 3077" document.
PROTECTIVE CLOTHING SELECTION

Determine the type of protective clothing item needed based on a risk assessment (e.g., gloves, garments, footwear).
For high risk situations, choose clothing that covers all parts of the body that may be exposed. In many cases, multiple clothing items will be required. Low risk situations may permit partial body protective clothing. Select protective clothing products that have reported chemical resistance data. High risk situations involving full body clothing or extended chemical contact often require permeation resistance data to determine the barrier effectiveness of materials used in the construction of clothing. Relatively low risk situations, where only splash or incidental exposure occur, may allow use of protective clothing based on degradation or penetration resistance data. Specifics on the interpretation of chemical resistance data are presented below.
Other factors must be considered in addition to chemical resistance. The selected chemical protective clothing item should offer the optimal combination of protection against identified hazards while allowing maximum function and comfort.

INTERPRETATION OF DEGRADATION RATINGS

Degradation refers to physical changes in a material as the result of chemical exposure. Degradation may become evident in visible changes, such as discoloration, swelling, delamination, deterioration, or disintegration. Degradation effects may also be measured by weight change or other changes in a material's physical properties (e.g., strength, elasticity, hardness).
Degradation resistance ratings are provided by manufacturers to rate the amount of degradation that occurs for a particular protective clothing material when contacted by a chemical. All degradation ratings are qualitative and include ratings, such as "EXCELLENT," "GOOD," "FAIR," "POOR," and "NOT RECOMMENDED." There is no standard test method for the measurement of chemical degradation resistance; therefore, manufacturer ratings may be based on different testing approaches. This makes comparison of degradation ratings between manufacturers unreliable.
The use of degradation resistance ratings alone to recommend protective clothing, particularly for high hazard situations, should be avoided. Degradation resistance testing does not directly assess the barrier quality of protective clothing, since materials can show relatively little degradation but still allow either permeation or penetration by a chemical. Degradation resistance ratings can be used to exclude protective clothing materials from consideration. Protective clothing materials with a "NOT RECOMMENDED" degradation resistance rating should never be used.
For some products, the rating "NO PENETRATION" is provided. This refers to penetration resistance test results that are based on a different procedure (American Society for Testing and Materials (ASTM) Standard Test Method F 903). Penetration resistance testing involves placing a material sample in a test cell, exposing the exterior side of the material to a chemical, and then observing the interior side of the material for visible signs of liquid penetration. Part of the test is conducted at an elevated pressure. Test results are reported as pass (no penetration) or fail (penetration detected). Unlike degradation testing, penetration testing provides an assessment of protective clothing material barrier performance. Since penetration resistance testing examines only observable amounts of liquid penetration, permeation may still occur. The use of penetration resistance data must be restricted to liquid chemicals, and should be limited to scenarios where there is no reasonable vapor exposure hazard under the conditions of exposure.

INTERPRETATION OF PERMEATION DATA

Permeation is the process of chemical movement through a material on a molecular level. Permeation resistance refers to the ability of a material to retard or prevent chemical movement through it. Permeation may occur without any visible signs of degradation.
Permeation resistance is measured using a test cell which is divided into two halves by a protective clothing specimen. Chemical is placed on the challenge side, while the collection side is periodically monitored for permeating chemical. Permeation data were obtained in accordance with the American Society for Testing and Materials (ASTM) Standard Test Method F 739 (Resistance of Materials Used in Protective Clothing to Permeation by Liquids and Gases), unless stated otherwise. In the case of chemicals that are classified as warfare agents, the data were obtained in accordance with the Military Standard 282 (MIL-STD-282) (Military Standard, Filter Units, Protective Clothing, Gas-Mask Components, and Related Products: Performance Test Methods).
Permeation rate is the amount of chemical that passes through a material for a measured surface area per unit time. In this section, permeation rate is expressed in micrograms per square centimeter per minute (mcg/cm(2)/min). The reported permeation rate is either the steady-state rate or the maximum rate observed during testing. In some cases, very large permeation rates exceed measurement techniques and are reported as ">" (greater than) or "HIGH."
Breakthrough time is the elapsed time, in minutes, from the time the chemical comes in contact with the material exterior surface, to the time that chemical is detected on the interior surface. When no breakthrough is detected, the breakthrough time is report as ">" the testing period. If permeation breakthrough is rapid, results are reported as "<" (less than) the earlier sampling time or as "IMMEDIATELY" (which usually means breakthrough in less than 4 minutes).
The breakthrough time should exceed the expected use period of the selected protective clothing. Additionally, there are several other factors that must be taken into account to provide appropriate protection.
Permeation testing is usually conducted with full strength, undiluted chemical for the duration of the test period. Actual exposures may involve diluted chemical for short or intermittent exposure periods.
Permeation testing is usually conducted at room temperature. Permeation occurs faster at elevated temperatures (short breakthrough times and higher permeation rates) and slower at reduced temperatures (long breakthrough times and lower permeation rates).
Permeation resistance of mixtures cannot usually be determined on the basis of the individual chemicals making up the mixture. Synergistic effects may occur and result in more rapid permeation than accounted for by the individual mixture chemicals.
Permeation rates may be used to calculate potential wearer exposure; however, several assumptions must be made about the extent of exposure and condition of clothing wear. Furthermore, there are few chemicals with dermal exposure limits, making it difficult to determine an acceptable skin exposure level.

COMPANY INFORMATION

Comasec Safety, Inc 8 Niblick Road Box 1219 Enfield, CT 06083-1219 USA Phone: (860) 741-2207 Fax: (860) 741-0881 Toll-Free: (800) 333-0219 Website: http://www.comasecsafety.com Email: info@comasecsafety.com
MAPA Spontex, Inc. 100 Spontex Dr. Columbia, TN 38401 USA Phone: (800) 537--2897 Fax: (800) 537--3299 Website: http://www.mapaglove.com Email: sales@mapaglove.com

REFERENCES

CHEMICAL PROTECTIVE CLOTHING CITATIONS

The following sources were consulted for chemical protective clothing data:

(Ansell-Edmont, 2001)
(Bata Shoe Company, 1995)
(Best Manufacturing, 2002)
(Best Manufacturing, 2004)
(Boss Manufacturing Company, 1998)
(ChemFab Corporation, 1993)
(Comasec Safety, Inc., 2003)
(Comasec Safety, Inc., 2003a)
(DuPont, 2002)
(DuPont, 2002)
(DuPont, 2003)
(Guardian Manufacturing Group, 2001)
(ILC Dover, Inc., 1998)
(Kappler Inc., 2001)
(Kimberly-Clark, 2002)
(LaCrosse-Rainfair, 1997)
(MAPA Professional, 2003)
(MAPA Professional, 2004)
(Mar-Mac Manufacturing, Inc, 1995)
(Marigold Industrial, 2003)
(Memphis Glove Company, 2001)
(Montgomery Safety Products, 1995)
(Nat-Wear, 2001)
(Neese Industries, Inc., 2003)
(North, 2002)
(North, 2002)
(Playtex, 1995)
(River City, 1995)
(Safety 4, 2002)
(Servus, 1995)
(Standard Safety Equipment, 1995)
(Tingley, 2002)
(Trelleborg-Viking, Inc., 2001)
(Trelleborg-Viking, Inc., 2002)
(Wells Lamont Industrial, 2002)
(Workrite, 1997)

-PHYSICAL HAZARDS

FIRE HAZARD

SUMMARY

Editor's Note: An ERG guide with information appropriate to this material does not exist.

FLAMMABILITY CLASSIFICATION

NFPA Flammability Rating for CAS7772-98-7 (NFPA, 2002):

Not Listed

FIRE CONTROL/EXTINGUISHING AGENTS

Editor's Note: An ERG guide with information appropriate to this material does not exist.

NFPA Extinguishing Methods for CAS7772-98-7 (NFPA, 2002):

Not Listed

REACTIVITY HAZARD

Sodium thiosulfate is a strong REDUCING AGENT and can react with oxidizers.

An explosion may occur if triturated with CHLORATES, NITRATES, OR PERMANGANATES (Persson & Walter, 1987).

The pentahydrate loses its water at 100 degrees C (Windholz, 1983).

It dissolves silver halides and many other silver salts (Windholz, 1983).

Sodium thiosulfate is incompatible with (Windholz, 1983):

Iodine
Acids
Lead
Mercury
Silver Salts

The pentahydrate dissolves in its own water of hydration; it effloresces in warm dry air (Windholz, 1983).

The aqueous solution slowly decomposes at room temperature and more rapidly when heated (Windholz, 1983).

The injectable form is stable for up to three years when mixed with 1.21 percent sodium phosphate dodecahydrate (Persson & Walter, 1987).

When heated to decomposition it emits fumes of SULFUR OXIDES (Persson & Walter, 1987).

Sodium thiosulfate in solution may be unstable to light (Schulz et al, 1983).

EVACUATION PROCEDURES

SUMMARY

Editor's Note: An ERG guide with information appropriate to this material does not exist.

AIHA ERPG Values for CAS7772-98-7 (AIHA, 2006):

Not Listed

DOE TEEL Values for CAS7772-98-7 (U.S. Department of Energy, Office of Emergency Management, 2010):

Listed as Sodium thiosulfate
TEEL-0 (units = mg/m3): 35
TEEL-1 (units = mg/m3): 100
TEEL-2 (units = mg/m3): 500
TEEL-3 (units = mg/m3): 500
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 CAS7772-98-7 (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 CAS7772-98-7 (National Institute for Occupational Safety and Health, 2007):

Not Listed

CONTAINMENT/WASTE TREATMENT OPTIONS

SUMMARY

Editor's Note: An ERG guide with information appropriate to this material does not exist.

SMALL LEAK/SPILL

Editor's Note: An ERG guide with information appropriate to this material does not exist.

LARGE LEAK/SPILL

Editor's Note: An ERG guide with information appropriate to this material does not exist.

-PHYSICAL/CHEMICAL PROPERTIES

MOLECULAR WEIGHT

ANHYDROUS: 158.13 (Budavari, 1996)

PENTAHYDRATE: 248.2 (Budavari, 1996)

DESCRIPTION/PHYSICAL STATE

Sodium thiosulfate occurs as white, transparent, almost odorless crystals or powder with a salty taste (ITI, 1985; Persson & Walter, 1987; HSDB , 2000) Reynolds, 2000).

6.5-8.0

DENSITY

TEMPERATURE AND/OR PRESSURE NOT LISTED

SOLID: 1.69 g/cm(3) (ITI, 1985)

FREEZING/MELTING POINT

MELTING POINT

48 degrees C (ITI, 1985)

BOILING POINT

Decomposes above 100 degrees C (Budavari, 1996)

SOLUBILITY

IN WATER

Sodium thiosulfate is soluble in 0.5 part water (Budavari, 1996).
The aqueous solution slowly decomposes at room temperature and more rapidly when heated (Budavari, 1996).

IN ORGANIC SOLVENTS

Sodium thiosulfate is practically insoluble in alcohol (Budavari, 1996).
It is soluble in turpentine oil (ITI, 1985).

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