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Chemical Identification
Common Name
Tetradifon
中文通用名
三氯杀螨砜
IUPAC
4-chlorophenyl 2,4,5-trichlorophenyl sulfone
CAS
1,2,4-trichloro-5-[(4-chlorophenyl)sulfonyl]benzene
CAS No.
116-29-0
Molecular Formula
C12H6Cl4O2S
Molecular Structure
Category
Activity
Larvicide; Acaricide
Premix
Emulsifiable concentrate, wettable powder, smoke generators. Premix Parters: benzofenap cumyluron;
Physical Properties
Molecular weight:356.0; Physical form:Colourless crystals; ( tech., slightly yellow). Density:1.515 (20 °C); Composition:Tech. grade tetradifon is ×95% pure. Melting point:148-149 °C (pure); ( tech. ×144 °C); Vapour pressure:3.2 × 10-5 mPa (20 °C); Henry constant:1.46 ×10-4 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 4.61; Solubility:In water 0.078 mg/l (20 °C). In acetone 82, benzene 148, chloroform 255, cyclohexanone 200, dioxane 223, kerosene 10, methanol 10, toluene 135, xylene 115 (all in g/l, 10 °C).; Stability:Extremely stable, even in strong acids and alkalis. Stable to heat and to sunlight. Resistant to strong oxidising agents.;
Toxicology
Oral:Acute oral LD50 for male rats >14 700 mg/kg. Percutaneous:Acute percutaneous LD50 for rabbits >10 000 mg/kg. Non-irritating to skin; slight eye irritant (rabbits). Inhalation: LC50 (4 h) for rats >3 mg/l air. Phytotoxicity:Except for some species of ornamentals (dahlia, ficus, cissus, primula, kalanchoe and some rose cultivars), non-phytotoxic when used as recommended.
Environmental Profile
Ecotoxicology: 
Algae: EC50 (96 h) for Selenastrum capricornutum >100 mg/l.Bees:Not hazardous to bees when used as recommended;LD50 (contact) >1250 µg/bee.Birds:Dietary LC50 (8 d) for bobwhite quail, Japanese quail, pheasants, mallard ducks >5000 mg/kg diet.Daphnia:LC50 (48 h) >2 ppm.Fish: LC50 (96 h) for bluegill sunfish 880, channel catfish 2100, rainbow trout 1200 mg/l. Worms:LD50 >5000 mg/kg substrate.Other beneficial spp.:Harmless at normal rates to the natural enemies of spider mites. 

Environmental fate: 
EHC report concludes there is no evidence of risk to the environment when used as recommended.Animals:In rats, following oral administration of a single dose, 70% was excreted via the bile in the faeces within 48 hours.Soil:Strongly and irreversibly bound to soil/humic acid complex; virtually immobile in soil.Plant:Non-systemic; tetradifon is not metabolised on plants.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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