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Chemical Identification
Common Name
Metam-sodium
中文通用名
威百亩
IUPAC
sodium methyldithiocarbamate
CAS
sodium methylcarbamodithioate
CAS No.
[137-42-8]
Molecular Formula
C2H4NNaS2
Molecular Structure
Physical Properties
Molecular weight:129.2; Physical form:Colourless crystals (dihydrate). Melting point:Decomposes without melting; Vapour pressure:Non-volatile; Partition coefficient(n-octanol and water):logP <1 (25 °C); Solubility:In water 722 g/l (20 °C). In acetone, ethanol, kerosene, xylene <5 g/l. Practically insoluble in most other organic solvents.; Stability:Stable in concentrated aqueous solution, but unstable when diluted. Decomposition is promoted by acids and heavy-metal salts. Solutions exposed to sunlight, 50 1.6 h ( 7, 25 °C); on hydrolysis (25 °C),
Toxicology
Oral:Acute oral 50 for male rats 1800, female rats 1700, mice 285 /kg. Acute oral 50 for rats of the methyl isothiocyanate formed in soil is 97 /50 for rabbits 1300 /; mild irritant to eyes, corrosive to skin. Any contact with skin or organs should be treated as a burn. Inhal
Environmental Profile
Ecotoxicology: 
Bees:Non-toxic to bees when used as directed.Birds:Acute oral 50 for bobwhite quail 500 /kg. Dietary 50 (5 d) for mallard ducks and Japanese quail >5000 / diet.Daphnia:50 (48 h) 2.3 /l.Fish:50 (96 h) for guppy 4.2, bluegill sunfish 0.39, rainbow trout 35.2 /l. WATER SOLUBILITY:722 g/l at 20°C
Transport Information
Signal Word:DANGER; Hazard Class:Ib(Highly hazardous)

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