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Chemical Identification
Common Name
Prometryn
中文通用名
扑草净
IUPAC
N2,N4-diisopropyl-6-methylthio-1,3,5-triazine-2,4-diamine
CAS
N,N′-bis(1-methylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine
CAS No.
7287-19-6
Molecular Formula
C10H19N5S
Molecular Structure
Category
Activity
Herbicide
Premix
Tribenuron-methyl+prometryn+isoproturon
Pyrazosulfuron-ethyl+prometryn+simetryn
Bensulfuron-methyl+butachlor+prometryn
Bensulfuron-methyl+prometryn
Bensulfuron-methyl+prometryn+acetochlor
Butachlor+Prometryn
Bensulfuron-methyl+Prometryn+Simetryn
Wettable powder, liquid. 
Premix Parters: clodinafop-propargyl;
Physical Properties
Molecular weight:241.4; Physical form:White powder. Density:1.15 (20 °C); Composition:Tech. is 97% pure. Melting point:118-120 °C; Vapour pressure:0.165 mPa (25 °C) ( OECD 104); Henry constant:1.2 × 10-3 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 3.1 (25 °C, unionised); pKa:4.1, weak base; Solubility:In water 33 3 mg/l (25 °C). In acetone 300, ethanol 140, hexane 6.3, toluene 200, n-octanol 110 (all in g/l, 25 °C).; Stability:Stable to hydrolysis at 20 °C in neutral, slightly acidic or slightly alkaline media. Hydrolysed by warm acids and alkalis. Decomposed by u.v. irradiation.
Toxicology
Oral:Acute oral LD50 for rats >2000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >3100, rabbits >2020 mg/kg. Not irritant to skin and slightly irritant to eyes of rabbits. Not a skin sensitiser (guinea pigs). Inhalation: LC50 (4 h) for rats >5170 mg/m3. Phytotoxicity:Used as a directed spray on cotton while young, to avoid foliar injury. ADI:Not established, not used in crops.
Environmental Profile
Ecotoxicology:
 Algae: EC50 (5 d) for Selenastrum capricornutum 0.023 mg/l.Bees:Not toxic to bees. 50 (oral) >99µg/bee; (contact) >130µg/bee.Birds:Dietary LC50 (8 d) for bobwhite quail >5000, mallard ducks >500 ppm.Daphnia:LC50 (48 h) 12.66 mg/l.Fish:LC50 (96 h) for rainbow trout 5.5, bluegill sunfish 7.9 mg/l.Worms:LC50 (14 d) for earthworms 153 mg/ kg soil.Other aquatic spp.: EC50 for mysid shrimp (Mysidopsis bahia) 1.7 mg/l. 

Environmental fate: 
Animals:For metabolism in rats and rabbits, see C. Boehme & F. Baer, Food Cosmet. Toxicol., 1967, 5, 23.Soil:In soil, microbial degradation takes place, with oxidation of the methylthio group to hydroxy metabolites, and dealkylation of the side-chains. Median DT50 in soil 50 d (14-158 d). Koc 400, indicatingPlant:Metabolised by tolerant plants, and, to a lesser extent, by sensitive plants, by oxidation of the methylthio group to hydroxy metabolites, and by dealkylation of the side-chains. Degradation in plants is generally slow. SOIL PARTICLE ADSORPTION: Approx. 3 months residual activity at 2 kg/ha WATER SOLUBILITY: 33 ppm at 20°C HAZARDS: Fish: LC50 10.0 mg/l (96 h) (bluegill), 2.5 mg/l (rainbow trout). Bee: Nontoxic
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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