Triclopyr

Triclopyr

三氯吡氧乙酸

3,5,6-trichloro-2-pyridyloxyacetic acid

[(3,5,6-trichloro-2-pyridinyl)oxy]acetic acid

55335-06-3

C₇H₄Cl₃NO₃

Herbicides > Pyridine herbicides

Herbicide

Triclopyr+clopyralid
Propanil+Triclopyr
Metsulfuron-methyl+triclopyr
Glyphosate+Triclopyr
Dicamba+Glyphosate+Triclopyr
Aminopyralid+Triclopyr-butotyl
Premix Parters: captan metalaxyl thiophanate-methyl; cyproconazole; fluoxastrobin prothioconazole; propiconazole; prothioconazole; tebuconazole; triadimefon;

Molecular weight:256.5; Physical form:Fluffy, colourless solid. Density:1.85 (21 °C).; Melting point:150.5 °C; Vapour pressure:0.2 mPa (25 °C, vapour pressure balance); Partition coefficient(n-octanol and water):logP = 0.42 (pH 5), -0.45 (pH 7), -0.96 (pH 9); pKa:3.97; Solubility:In water 0.408 (purified), 7.69 ( pH 5), 8.10 ( pH 7), 8.22 ( pH 9) (all in g/l, 20 °C). In acetone 581, acetonitrile 92.1, hexane 0.09, toluene 19.2, dichloromethane 24.9, methanol 665, ethyl acetate 271 (a; Stability:Stable under normal storage conditions and to hydrolysis, but subject to photodecomposition, DT50 <12 h.;

Oral:Acute oral LD₅₀ for male rats 692, female rats 577 mg/kg. Percutaneous:Acute percutaneous LD₅₀ for rabbits >2000 mg/kg. Mild eye irritant; non-irritating to skin (rabbits). Inhalation: LC₅₀ (4 h) for rats >256 ppm. Phytotoxicity:Clovers are sensitive, as also are larch, lodgepole pine, ornamentals, and edible crops.

Ecotoxicology: 
Algae: EC₅₀ (5 d) for Selenastrum capricornutum 45 mg/l.Bees:Non-toxic to bees; contact LD₅₀ >100 µg/bee.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. Daphnia: LC₅₀ (48 h) 133 mg/l.Fish:LC₅₀ (96 h) for rainbow trout 117, bluegill sunfish 148 mg/l. 

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.Soil: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 amoPlant:In plants, DT₅₀ c. 3-10 d. The main metabolite is 3,5,6-trichloro-2-methoxypyridine.

Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)