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Chemical Identification
Common Name
Chinomethionat
中文通用名
灭螨猛
IUPAC
6-methyl-1,3-dithiolo[4,5-b]quinoxalin-2-one
or
S,S-(6-methylquinoxaline-2,3-diyl) dithiocarbonate
CAS
6-methyl-1,3-dithiolo[4,5-b]quinoxalin-2-one
CAS No.
2439-01-2
Molecular Formula
C10H6N2OS2
Molecular Structure
Category
Activity
Fungicide, acaricide
Premix
Dustable powder, suspension concentrate, wettable powder. Premix Parters: pyrazophos; sulfur;
Physical Properties
Molecular weight:234.3; Physical form:Yellow crystals. Density:1.556 (20 °C); Melting point:170 °C; Vapour pressure:0.026 mPa(20 °C); Henry constant:6.09×10-3 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 3.78 (20 °C); Solubility:In water 1 mg/l (20 °C). In toluene 25, dichloromethane 40, hexane 1.8, isopropanol 0.9, cyclohexanone 18, dimethylformamide 10, petroleum oils 4 (all in g/l, 20 °C). Soluble in hot benzene and dioxane.; Stability:Relatively stable under normal conditions. Hydrolysed in alkaline media; DT50 (22 °C) 10 d (pH 4), 80 h (pH 7), 225 min(pH 9). Moderately soluble in organic solvents.
Toxicology
Oral:Acute oral LD50 for male rats 2541, female rats 1095 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >5000 mg/kg. Slightly irritating to skin; severely irritating to eyes (rabbits). Inhalation:LC50 (4 h) for male rats >4.7, female rats 2.2 mg/l (dust). Phytotoxicity:Phytotoxic to certain varieties of apple, pear, currant, rose, and ornamentals.
Environmental Profile
Ecotoxicology: Algae:ErC50 (96 h) for Scenedesmus 0.14 mg/l.Bees:Not toxic to bees; LD50>100 mg/bee.Birds:Acute oral LD50 for bobwhite quail 196 mg/kg. Dietary LC50 (5 d) for bobwhite quail 2409, mallard ducks >5000 mg/kg diet.Daphnia:LC50 (48 h) 0.12 mg/l.Fish:LC50 (96 h) for bluegill sunfish 0.0334, rainbow trout 0.131, golden orfe 0.24 mg/l.Worms:LC50 (14 d) >1000 mg/kg. Environmental fate: Animals:In rats, following oral administration, chinomethionat is rapidly metabolised, and c. 90% is eliminated within 3 days in the faeces and urine. The main metabolite is chinomethionat acid (dimethylmercaptoquinoxaline-6-carboxylic acid), which also Soil:Koc 45-90 (3 soil types from sandy loam to high organic matter). DT50 in standard soil land 2 1-3 d.Plant:After application to fruit, no penetration of the a.i. or metabolites in the fruit pulp was observed. The only metabolite detected was dihydromethylquinoxalinedithiol. WATER SOLUBILITY: 1 mg/l at 20° C
Transport Information
Hazard Class:III (Slightly hazardous)

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