Chlorthiamid

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Chlorthiamid

中文通用名

氯硫酰草胺

IUPAC

2,6-dichlorothiobenzamide

CAS

2,6-dichlorobenzenecarbothioamide

CAS No.

1918-13-4

Molecular Formula

C₇H₅Cl₂NS

Molecular Structure

General Product Information

Category

Herbicides > Amide herbicides

Activity

Herbicide
An obsolete pre-emergence herbicide once used for total weed control in non-crop and aquatic situations

Physical & Safety Data

Physical Properties

Molecular weight:206.1; Physical form:Off-white solid. Melting point:151-152 °C; Vapour pressure:0.13 mPa (20 °C); Henry constant:2.82×10-5 Pa m3 mol-1 (calc.); Solubility:In water 950 mg/l (21 °C). In aromatic and chlorinated hydrocarbons 50-100 g/kg. Stability:Thermally stable up to 90 °C. Stable in acidic solutions, but is converted to dichlobenil in alkaline solutions.

Toxicology

Oral:Acute oral LD₅₀ for rats 757 mg/kg, mice 500 mg/kg. Percutaneous:Acute percutaneous LD₅₀ for rats >1000 mg/kg.

Environmental Profile

Ecotoxicology:
Bees:Not toxic to bees.Birds:Acute oral LD₅₀ for chickens 500 mg/kg. Fish:LC₅₀ (24 h) for harlequin fish 41 mg/l.
Environmental fate:
Animals:In rats, following oral administration, there is rapid metabolism and 70% elimination in the urine within 24 hours.Soil:In soil, chlorthiamid is converted to dichlobenil, which then gradually undergoes microbial degradation to 2,6-dichlorobenzamide and 2,6-dichlorobenzoic acid. Converted to dichlobenil in soil, DT₅₀ for loss from soil.

Transport Information

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