Specifications

triclopyr 95%TC and 48%EC(480g/L EC)
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NOMENCLATURE
Common name: triclopyr

 

Classification:agricultural herbicide

  

Chemical name: [(3,5,6-trichloro-2-pyridyl)oxy]acetic acid

 

CAS RN [55335-06-3]

 

Development codes: Dowco 233 (Dow)

 

PHYSICAL CHEMISTRY
Mol. wt. 256.5 M.f. C7H4Cl3NO3 Form Fluffy, colourless solid. M.p. 150.5 ºC B.p. Decomposes at 208 ºC V.p. 0.2 mPa (25 ºC, vapour pressure balance) KOW logP = 0.42 (pH 5), -0.45 (pH 7), -0.96 (pH 9) S.g./density 1.85 (21 ºC). Solubility In water 0.408 (purified), 7.69 (pH 5), 8.10 (pH 7), 8.22 (pH 9) (all in g/l, 20 ºC). In acetone 581, acetonitrile 92.1, hexane 0.09, toluene 19.2, dichloromethane 24.9, methanol 665, ethyl acetate 271 (all in g/l). Stability Stable under normal storage conditions and to hydrolysis, but subject to photodecomposition, DT50 <12 h. pKa 3.97

 

APPLICATIONS
Biochemistry Synthetic auxin (acting like indolylacetic acid). Mode of action Selective systemic herbicide, rapidly absorbed by the foliage and roots, with translocation throughout the plant, accumulating in meristematic tissue. Induces auxin-type responses in susceptible species (mainly broad-leaved weeds, grass weeds being unaffected at normal application rates).

Uses Control of woody plants and many broad-leaved weeds (e.g. nettles, docks, brambles, gorse, broom) in grassland, uncultivated land, industrial areas, coniferous forests, plantation crops, and rice fields. In plantation crops (oil palm, rubber) at 125-250 g a.e./ha for covercrop maintenance, and at 0.72-1.0 kg a.e./ha to control Eupatorium odoratum and other problem plants; in pastures at 1-2 kg/ha to control annual and perennial herbaceous weeds, and at 2-4 kg/ha against Rubus spp. and other woody plants; in forestry at 4-8 kg/ha for site preparation, and at 1.5-2.0 kg/ha for conifer release; for industrial sites at 2-8 kg/ha; in rangeland at 0.24-1.0 kg/ha. Phytotoxicity Clovers are sensitive, as also are larch, lodgepole pine, ornamentals, and edible crops.

 

MAMMALIAN TOXICOLOGY
Oral Acute oral LD50 for male rats 692, female rats 577 mg/kg. Skin and eye Acute percutaneous LD50 for rabbits >2000 mg/kg. Mild eye irritant; non-irritating to skin (rabbits). Inhalation LC50 (4 h) for rats >256 ppm. NOEL (2 y) for rats 3.0 mg/kg b.w. daily, for mice 35.7 mg/kg b.w. daily. ADI 0.005 mg/kg b.w. Toxicity class WHO (a.i.) III; EPA (formulation) III

 

ECOTOXICOLOGY
Birds Acute oral LD50 for mallard ducks 1698 mg/kg. Dietary LC50 (8 d) for mallard ducks >5000, Japanese quail 3278, bobwhite quail 2935 mg/kg. Fish LC50 (96 h) for rainbow trout 117, bluegill sunfish 148 mg/l. Daphnia LC50 (48 h) 133 mg/l. Algae EC50 (5 d) for Selenastrum capricornutum 45 mg/l. Bees Non-toxic to bees; contact LD50 >100 mg/bee.

 

ENVIRONMENTAL FATE
Animals In mammals, following oral administration, excretion is primarily via the urine as the unchanged compound. For details of minor urinary metabolites, see C. Timchalk et al., Toxicology, 1990, 62, 71. Plants In plants, DT50 c. 3-10 d. The main metabolite is 3,5,6-trichloro-2-methoxypyridine. Soil/Environment In soil, fairly rapid degradation by microbial activity, with an average half-life of 46 d, depending on soil and climatic conditions. The major degradation product is 3,5,6-trichloro-2-pyridinol (which has a soil half-life of 30-90 d), with a smaller amount of 3,5,6-trichloro-2-methoxypyridine. Koc c. 59 ml/g; Kd c. 87 (unaged samples), c. 225 (aged) ml/g.