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Common NameDazomet
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中文通用名棉隆
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IUPAC3,5-dimethyl-1,3,5-thiadiazinane-2-thione
or
tetrahydro-3,5-dimethyl-1,3,5-thiadiazine-2-thione -
CAStetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione
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CAS No.533-74-4
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Molecular FormulaC5H10N2S2
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Molecular Structure
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CategoryNematicides > Unclassified nematicides
Herbicides > Dithiocarbamate herbicides
Fungicides > Dithiocarbamate fungicides
Fumigants > Fumigants -
ActivityFumigant, nematicide, fungicide, herbicide, insecticide
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Physical PropertiesMolecular weight:162.3; Physical form:Colourless crystals. Density:1.37 ( tech.); Composition:94% pure. Melting point:104-105 °C ( decomp.; tech. grade); Vapour pressure:0.37 at 20 °C; Henry constant:2.00×10-5 Pa m3 mol-1 ( calc.). Partition coefficient(n-octanol and water):logP = 0.15 ( pH 7); Solubility:In water 3 g/ kg (20 °C). In cyclohexane 400, chloroform 391, acetone 173, benzene 51, ethanol 15, diethyl ether 6 (all in g/ kg, 20 °C). Stability:Stable at temperatures up to 35 °C. Sensitive to temperatures >50 °C, and to moisture. Hydrolysed in acidic media to carbon disulfide, formaldehyde, and methylamine. Soluble in organic solvents.
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ToxicologyOral:Acute oral
LD50 for rats 520, male mice 455, female mice 710, rabbits 320-620 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg; DP formulation is a skin and eye irritant to rabbits. Inhalation: LC50 (4 h) for rats 8.4 mg/l air. Phytotoxicity:Highly phytotoxic to all green plants. Treated soils should not be planted until shown to be free of dazomet and its -
Environmental ProfileEcotoxicology:
Algae:EC50 (96 h) for Scenedesmus subspicatus 1.0 mg/l.Bees:Not toxic to bees when used as directed.Birds: LD50 for bobwhite quail 415 mg/kg b.w. LC50 for bobwhite quail 1850, mallard ducks >5000 mg/kg diet.Daphnia: EC50 (48 h) 0.3 mg/l.Fish: 50 (96 h) 0.16 mg/l.Other aquatic spp.:EC10 (17 h) for Pseudomonas putida 1.8 mg/l.
Environmental fate:
Soil:In soil, in the presence of moisture, undergoes degradation to methyl(methylaminomethyl)dithiocarbamic acid, which then undergoes further degradation to methyl isothiocyanate, formaldehyde, hydrogen sulfide, and methylamine. See N. Drescher & S. Otto,ppm in the fruit.
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Transport InformationSignal Word:WARNING; Hazard Class:II (Moderately hazardous)
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