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Chemical Identification
Common Name
Pyrazophos
中文通用名
吡菌磷
IUPAC
ethyl 2-diethoxyphosphinothioyloxy-5-methylpyrazolo[1,5-a]pyrimidine-6-carboxylate
or
O-6-ethoxycarbonyl-5-methylpyrazolo[1,5-a]pyrimidin-2-yl O,O-diethyl phosphorothioate
CAS
ethyl 2-[(diethoxyphosphinothioyl)oxy]-5-methylpyrazolo[1,5-a]pyrimidine-6-carboxylate
CAS No.
13457-18-6
Molecular Formula
C14H20N3O5PS
Molecular Structure
Category
Activity
Fungicide
Premix
Emulsifiable concentrate. 
Premix Parters: chlorpropham piperonyl butoxide; lindane; permethrin; pheromone; piperonyl butoxide; rotenone;
Physical Properties
Molecular weight:373.4; Physical form:Colourless crystals. Density:1.348 at 25 °C; Composition:Tech. grade is >94% pure. Melting point:51-52 °C; Flash point:34 °C (Abel-Pensky closed method); Vapour pressure:0.22 mPa (50 °C) (Antoine); Henry constant:2.578 × 10-4 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 3.8; Solubility:In water 4.2 mg/l (25 °C). Readily soluble in most organic solvents, e.g. xylene, benzene, carbon tetrachloride, dichloromethane, trichloroethylene. In acetone, toluene, ethyl acetate >400, hexane 16.6 (all in g/l, 20 °C).; Stability:Hydrolysed by acids and alkalis. Unstable in undiluted form.
Toxicology
Oral:Acute oral LD50 for rats 151-778 mg/ kg (depending on sex and carrier). Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin; slightly irritating to eyes (rabbits). Inhalation: LC50 (4 h) for rats 1220 mg/m3 air. Phytotoxicity:Non-phytotoxic when used as recommended (except to some varieties of grape). ADI:(Japan) 0.006 mg/ kg.
Environmental Profile
Ecotoxicology: 
Algae: LC50 (72 h) for Scenedesmus subspicatus 65.5 mg/l.Bees: LD50 (24 h, contact) 0.25µg/bee.Birds:Acute oral LD50 for quail (depending on carrier and sex) 118-480 mg tech./kg. Dietary LC50 (14 d) for mallard ducks c. 340, bobwhite quail c. 300 50 (48 h) 0.36µg/l (soft water), 0.63µg/l (hard water). 50 (96 h) for carp 2.8-6.1, rainbow trout 0.48-1.14, bluegill sunfish 0.28 mg/l.Worms: LC50 (14 d) for Eisena foetida >1000 mg/ kg soil.Other beneficial spp.:'Afugan 30 EC' rated harmful to Poecilus cupreus, Syrphus corollae, Chrysoperla carnea and Aleochara bilineata; harmless to Pardosa amentata (IOBC scheme). 

Environmental fate: 
Animals:Extensively metabolised and rapidly eliminated in rats, DT50 4-5 h. Excretion mainly in urine; the most important metabolite is ethyl 2-hydroxy-5-methyl-6-pyrazolo[1,5-a]pyrimidine-carboxylate, partly excreted as a sulfSoil:Soil degradation occurs by cleavage of the phosphoric acid group, saponification of the carboxylate fraction and further degradation of the heterocyclic ring system, ultimately to CO2. Degradation rates vary with soil type and properties, with Plant:Half-life in wheat leaves c. 19 d. Following hydrolysis of the phosphate bond, a b-glucoside of the pyrazolopyrimidine is formed. WATER SOLUBILITY: 4.2 mg/l at 25°C
Transport Information
Signal Word:WARNING; Hazard Class:II(Moderately hazardous)

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