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Chemical Identification
Common Name
Triflusulfuron-methyl
中文通用名
氟胺磺隆
IUPAC
methyl 2-[4-dimethylamino-6-(2,2,2-trifluoroethoxy)-1,3,5-triazin-2-ylcarbamoylsulfamoyl]-m-toluate
CAS
methyl 2-[[[[[4-(dimethylamino)-6-(2,2,2-trifluoroethoxy)-1,3,5-triazin-2-yl]amino]carbonyl]amino]sulfonyl]-3-methylbenzoate
CAS No.
126535-15-7
Molecular Formula
C17H19F3N6O6S
Molecular Structure
Category
Activity
Herbicide

Triflusulfuron-methyl is absorbed mainly through foliage and translocated to the meristematic tissue. Some product is also taken up by the root system. The optimum timing for application is early post-emergence (from coleoptile to four leaves in weeds), although the product can be used from crop emergence to row closure. Adjuvants, such as non-ionic surfactants and mineral oils, are required for optimum activity. DuPont recommends sequential applications at one- to two-week intervals to enhance the activity of the product, with a maximum number of four treatments per crop. Complementary herbicides, such as phenmedipham and metamitron, can be tank-mixed with triflusulfuron-methyl to extend the product's use spectrum.

Triflusulfuron-methyl shows good selectivity for sugar beet and fodder beet; any phytotoxicity that occurs does not affect the yield or quality of the sugar syrup. In field trials, triflusulfuron-methyl gave equal or better control of weeds at much lower application rates than standard treatments.
CropUse
CropUses:
Sugar beet, chicory

Sugar and fodder beet

15-30 g ai/ha

Chicory

50 g ai/ha

Premix
Water dispersible granule. 

Type

AI concn

Water-dispersible granule (WG)

50% (w/w)

Physical Properties
Molecular weight:492.4; Physical form:White, crystalline solid. Density:1.45; Composition:Tech. is >96%. Melting point:160-163 °C; (tech., 155-158 °C); Vapour pressure:<1 × 10-2 mPa (25 °C); Henry constant:<5.9 × 10-5 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 0.96 ( pH 7); pKa:4.4; Solubility:In water 1 (pH 3), 3 (pH 5), 110 (pH 7), 11 000 ( pH 9) (all in mg/l, 25 °C). In methylene chloride 580, acetone 120, methanol 7, toluene 2, acetonitrile 80 (all in ; Stability:Rapidly hydrolysed in water, DT50 3.7 d ( pH 5), 32 d ( pH 7), 36 d ( pH 9) (all 25 °C).;
Toxicology
Oral:Acute oral LD50 for rats >5000 mg/kg. Percutaneous:Acute percutaneous LD50 for rabbits >2000 mg/kg. Non-irritating to skin and eyes (rabbits). Non-sensitising to skin (guinea pigs). Inhalation: LC50 (4 h) for rats >5.1 mg/l. ADI:0.024 mg/kg.
Environmental Profile
Ecotoxicology: 
Algae: EC50 (120 h) for green algae 0.62 mg/l.Bees:Oral LD50 (48 h) >1000 ppm.Birds:LD50 for mallard ducks and bobwhite quail 2250 mg/kg. Dietary LC50 for mallard ducks and bobwhite quail >5620 ppm.Daphnia:LC50 (48 h) >960 mg/l.Fish: LC50 (96 h) for bluegill sunfish 760, trout 730 mg/l.Worms: LD50 for earthworms >1000 mg/kg.Other aquatic spp.:LC50 (14 d) for Lemna gibba 9.0 µg/l. 

Environmental fate: 
The compound rapidly degrades in water, soil, plants, and animals. The primary metabolic pathways in all the systems are the cleavage of the sulfonylurea bridge, yielding methyl saccharin and triazine amine, followed by N-demethylation to N-desmethyl triaSoil:Degrades rapidly in soil by chemical and microbial mechanisms. Microbial degradation is important in alkaline conditions, but plays only a minor role in neutral and acidic conditions because chemical hydrolysis is very rapid. Half-life in soil 3 d. Bioacc

Mallard duck

LD50 >2,250 mg/kg

Bobwhite quail

LD50 >2,250 mg/kg

Bluegill sunfish [6 hrs]

LC50 7,960 mg/litre

Bee [contact]

LD50 >25 μg/bee

Earthworm [14 days]

LC50 1,000 mg/kg

Fate in soil:
Triflusulfuron-methyl is rapidly degraded by chemical and microbial pathways. The half-life ranges from 3 to 6 days.

Fate in aquatic systems:
Triflusulfuron-methyl has a half-life of 3.7 days in water at pH 5. The half-life rises with pH. Its potential for leaching to ground water is low.

Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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