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Chemical Identification
Common Name
2,3,6-TBA
中文通用名
草芽畏
IUPAC
2,3,6-trichlorobenzoic acid
CAS
2,3,6-trichlorobenzoic acid
CAS No.
50-31-7
Molecular Formula
C7H3Cl3O2
Molecular Structure
Category
Activity

Herbicide

CropUse

Used post-emergence, in combinations with other growth regulator herbicides, in cereals and grass seed crops to control broad-leaved annual and perennial weeds, including Bilderdykia convolvulus, Galium aparine, Polygonum aviculare, P. persicaria, Chamomilla and Matricaria spp.

Physical Properties
Molecular weight:225.5g/mol; Physical form:Colourless crystals; ( tech., colourless to buff, crystalline powder). Composition:Tech. grade is c. 60% 2,3,6-TBA. Melting point:125-126℃ (pure acid); c. 80-100℃ ( tech.); Vapour pressure:Very low at room temperature; 3.2 Pa (100 ℃); Solubility:In water 7.7 g/l (22℃). Readily soluble in common organic solvents, e.g. acetone 60.7, benzene 23.8, chloroform 23.7, ethanol 63.7, methanol 71.7, xylene 21.0 (all in g/100 ml). Stability:Stable to light, and to temperatures up to 60℃.
Toxicology

Oral:Acute oral LD50 for rats 1500, mice 1000, guinea pigs >1500, rabbits 600 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >1000 mg/kg.

Environmental Profile

Ecotoxicology:
Bees:Not toxic to bees.Birds:Acute oral LD50 for hens >1500 mg/kg.Fish:Threshold value for toxic activity 100-150 mg/l for perch and 300 mg/l for roach. One of several determining factors is the content of the second, more toxic, 2,4,5- isomer in the active ingredient.?
Environmental fate:
Animals:In mammals, excretion is mainly as the unchanged form in the urine.Soil:Very slow degradation in soil. A stable protein complex may possibly be formed.

Transport Information
Hazard Class:III (Slightly hazardous)

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