LD50- (ORAL)GUINEA_PIG:

LD50- (ORAL)RABBIT:

LD50- (SKIN)RABBIT:

LD50- (ORAL)RAT:

TDLo- (ORAL)RAT:

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

Containers may explode when heated.

Runoff may pollute waterways.

Do not touch damaged containers or spilled material unless wearing appropriate protective clothing.

Stop leak if you can do it without risk.

Prevent entry into waterways, sewers, basements or confined areas.

Cover with plastic sheet to prevent spreading.

Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers.

DO NOT GET WATER INSIDE CONTAINERS.

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.

Results of a study focusing on forestry-use herbicides, including triclopyr, found that residue concentrations of the compound in water bodies were low and did not persist over extended time periods. (This result did not hold true if herbicide application is made directly to ephemeral streams or channels.) (Neary & Michael, 1996).

Aqueous photolysis studied in pH-buffered water and natural river water produced the following results: Similar decay rates and photoproduct distribution were evident for triclopyr after exposure to diffuse mercury lamps and midsummer sunlight. Photolysis of the herbicide in untreated river water generated oxamic acid as the predominant byproduct and several other low-molecular-weight carboxylic acids as lesser byproducts. In pH-buffered water, 5-chloro-3,6-dihydroxy-2-pyridinyloxyacetic acid was the major byproduct. Minor photoproducts included oxamic acid and other low-molecular-weight acids. At 25 degrees C, the pseudo first-order half-life for triclopyr averaged 0.5 days in pH-buffered water and 1.3 days in natural river water (Woodburn et al, 1993).

Triclopyr was studied under aquatic use conditions in three 4-h plots in Lake Seminole, Georgia. The herbicide was applied twice to the plots at a rate of 2.5 mg/L. Results indicate a triclopyr aqueous-phase half-life of 0.5 to 3.6 days; the same amount of dissipation was evident in surface and bottom waters. 3,5,6-trichloro-2-pyridinol was the intermediate photodecay product; its half-life was less than 1 day (Woodburn et al, 1993a).

A study investigating triclopyr terrestrial fate was conducted in a rice-producing area of Arkansas on two soils and two subsoils. Triclopyr mobility was lowest and sorption highest in low pH subsoil. In soil where sorption was highest, the compound's dissipation rate was lowest. Degradation was more rapid at higher, rather than lower, temperatures. The herbicide's average half-life was 138 days (Johnson, et al 1995).

In a field study to determine triclopyr persistence in soil and water, a liquid formulation was used postemergence on paddy rice, rainfed lowland rice, and bare ground. Analysis by gas chromatography of soil and water samples taken at various intervals until 49 days post application indicated 50% dissipation of the initial concentration, with DT50s in each of the testing sites being 10 days or fewer. Triclopyr remained slightly longer in soil than in water (Johnson et al, 1995).

Triclopyr and several other pesticides were tested on Crowley silt loam soil from 2, 20 and 60 cm deep. The treated soil was then buried in degradation or leaching containers for 0, 34, 104, 184, 280, 371, 736 or 1066 days. Fifty percent of the initial dose of triclopyr dissipated in 94 days or fewer. Dissipation rates of all pesticides decreased with increasing soil depth (Johnson & Lavy, 1994).

Triclopyr is subject to photolysis (Budavari, 1996).

In a study of triclopyr in Lake Seminole, Georgia, the herbicide's half-life in aquatic plants averaged 4 days (Woodburn et al, 1993a).