Triflusulfuron-methyl

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

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

General Product Information

Category

Herbicides > Sulfonylurea Herbicides

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 & Safety Data

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)