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Chemical Identification
Common Name
Flumetsulam
中文通用名
唑嘧磺草胺
IUPAC
2′,6′-difluoro-5-methyl[1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonanilide
CAS
N-(2,6-difluorophenyl)-5-methyl[1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonamide
CAS No.
98967-40-9
Molecular Formula
C12H9F2N5O2S
Molecular Structure
Category
Activity
Herbicide
Flumetsulam is active following applications to soil and to foliage. It can be applied prior to planting and pre-emergence in soybeans and pre-emergence to early post-emergence (from 2-4 true leaves in weeds) in maize. Flumetsulam is safe to maize, soybeans and small-grain cereals, but phytotoxic to oilseed rape, cotton and sugar beet.
CropUse
CropUses:
Small-grain cereals, maize, soybeans, peas, clover, medic and turf

Maize

79 g ai/ha

Premix
Thifensulfuron-methyl+bentazone+flumetsulam
Florasulam+flumetsulam
Nicosulfuron+Atrazine+Flumetsulam
Acetochlor+Atrazine+Flumetsulam
Atrazine+Flumetsulam

Water-dispersible granule (WG) 
Premix Parters: prothioconazole; prothioconazole trifloxystrobin;

Physical Properties
Molecular weight:325.3; Physical form:Off-white, odourless solid. Density:1.77 (21 °C); Melting point:251-253 °C; Flash point:>93 °C; Vapour pressure:3.7 ×10-7 mPa (25 °C); Partition coefficient(n-octanol and water):logP = -0.68 (25 °C, unstated pH); pKa:4.6; Solubility:In water 49 mg/l ( pH 2.5); solubility increases with pH. Very slightly soluble in acetone and methanol. Insoluble in hexane and xylene.; Stability:Aqueous photolysis DT50 6-12 mo. Soil photolysis DT50 3 mo.
Toxicology
Oral:Acute oral LD50 for rats >5000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits >2000 mg/kg. Slightly irritating to eyes (rabbits). Non-sensitising to skin (guinea pigs). Inhalation: LC50 (4 h) >1.2 mg/l. Phytotoxicity:Crops damaged by soil application of flumetsulam include sugar beet, cotton, oilseed rape, grain sorghum, tomatoes, and sunflowers. ADI:0.17 mg/ kg.
Environmental Profile

Ecotoxicology: 
Bees: LC50 >100 μg/bee. NOEL 36 μg/bee. Birds:Acute oral LD50 for bobwhite quail >2250 mg/l. Dietary LC50 (8 d) for bobwhite quail and mallard ducks >5620 mg/l.Daphnia:Non-toxic.Fish: LC50 (96 h) for silverside minnow >379 mg/l. Non-toxic to fathead minnow and bluegill sunfish.Other aquatic spp.: LC50 for shrimp >349. 

Environmental fate: 
Animals:Rapidly cleared via urine and faeces with no metabolites. 5-Hydroxy metabolite found in the hen.Soil:Availability of flumetsulam in soil is principally dependent upon soil pH and organic matter. Herbicidal activity increases as pH increases and organic matter decreases. DT50 in soil (25 °C, Plant: DT50 in maize 2 h, soya beans 18 h, Chenopodium 131 h. Metabolites depend on the species; 5-hydroxy or 5-methoxy derivatives are common.

Transport Information
Hazard Class:III(Slightly hazardous)

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