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Chemical Identification
Common Name
Pyrazosulfuron-ethyl
中文通用名
吡嘧磺隆
IUPAC
ethyl 5-[(4,6-dimethoxypyrimidin-2-ylcarbamoyl)sulfamoyl]-1-methylpyrazole-4-carboxylate
CAS
ethyl 5-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-1-methyl-1H-pyrazole-4-carboxylate
CAS No.
93697-74-6
Molecular Formula
C14H18N6O7S
Molecular Structure
Category
CropUse
It has eminent activity against a broad spectrum of annual and perennial rice paddy weeds, especially broad leaf weeds and sedges, with pre-emergence and early post-emergence application and at extremely low use rates.
Premix
Pyrazosulfuron-ethyl+dimethametryn+esprocarb+pretilachlor
Pyrazosulfuron-ethyl+esprocarb
Pyrazosulfuron-ethyl+mefenacet
Pyrazosulfuron-ethyl+molinate
Pyrazosulfuron-ethyl+pretilachlor
Pyrazosulfuron-ethyl+propanil
Pyrazosulfuron-ethyl+quinclorac
Pyrazosulfuron-ethyl+mefenacet+alachlor
Pyrazosulfuron-ethyl+butachlor
Pyrazosulfuron-ethyl+prometryn+simetryn
Pyrazosulfuron-ethyl+Penoxsulam
Pyrazosulfuron-ethyl+Clomazone+Pretilachlor
Pyrazosulfuron-ethyl+Quinclorac+Bispyribac-sodium
Pyrazosulfuron-ethyl+Pyriminobac-methyl
Pyrazosulfuron-ethyl+Clomazone+Butachlor
Quinclorac+Carfentrazone-ethyl+Pyrazosulfuron-ethyl
Pyrazosulfuron-ethyl+Pyriminobac-methyl+Pretilachlor
Pyrazosulfuron-ethyl+Diflufenican
Pyrazosulfuron-ethyl+Oxyfluorfen+Pendimethalin
Pyrazosulfuron-ethyl+Pendimethalin+Oxadiazon
Pyribenzoxim+Pyrazosulfuron-ethyl+Cyhalofop-butyl
Quinclorac+Pyribenzoxim+Pyrazosulfuron-ethyl
Penoxsulam+Pyrazosulfuron-ethyl+Cyhalofop-butyl
Penoxsulam+Pretilachlor+Pyrazosulfuron-ethyl
Penoxsulam+Pyrazosulfuron-ethyl+Quinclorac
MCPA-sodium+Pyrazosulfuron-ethyl
Pyrazosulfuron-ethyl+MCPA-sodium+Carfentrazone-ethyl
Quinclorac+Pretilachlor+Pyrazosulfuron-ethyl
Pyrazosulfuron-ethyl+Clomazone+Pendimethalin
Quinclorac+Pyrazosulfuron-ethyl+Cyhalofop-butyl
Cyhalofop-butyl+Pyrazosulfuron-ethyl+Bispyribac-sodium
Granule, suspension concentrate, wettable powder. Premix Parters: daimuron imazosulfuron.
Physical Properties
Molecular weight:414.4. Physical form:Colourless crystals. Density:1.46 (20 °C); Melting point:177.8-179.5 °C; Vapour pressure:4.2×10-5 mPa (25 °C); Partition coefficient(n-octanol and water):logP = 1.3 (unstated pH); pKa:3.7; Solubility:In water 9.96 mg/l (20 °C). In methanol 4.32, hexane 0.0185, benzene 15.6, chloroform 200, acetone 33.7 (all in g/l, 20 °C).; Stability:Stable at 50 °C for 6 months. Relatively stable at pH 7. Unstable in acidic or alkaline media. Soluble in chloroform, and ethyl acetate.
Toxicology
Oral:Acute oral LD50 for rats and mice >5000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin and eyes (rabbits). Non-sensitising to skin (guinea pigs). Inhalation: LC50 for rats >3.9 mg/l air. ADI:( JMPR) 0.004 mg/ kg b.w. [1992].
Environmental Profile
Ecotoxicology: 
Algae:I50 for green algae (Scenedesmus acutus) 1 ppm.Bees: LD50 (contact) >100 μg/bee.Birds:Acute oral LD50 for bobwhite quail >2250 mg/.Daphnia: TLm (3 h) >40 ppm.Fish: LC50 (96 h) for rainbow trout and bluegill sunfish >180 mg/l; (48 h) for carp >30 mg/l. 
Environmental fate: 
Animals:In rats, after 48 h, 80% of applied pyrazosulfuron-ethyl is excreted in urine and faeces. The major metabolic reaction is demethylation of the methoxy group.Soil:In soil, DT50 <15 d. In water, DT50 in buffer solution ( pH 7), paddy fields or river water are c. 28 d.
WATER SOLUBILITY: 1494 ppm at 25°C (pH7).
Transport Information
Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)

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