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Chemical Identification
Common Name
Oxasulfuron
中文通用名
环氧嘧磺隆
IUPAC
oxetan-3-yl 2-[(4,6-dimethylpyrimidin-2-yl)carbamoylsulfamoyl]benzoate
CAS
3-oxetanyl 2-[[[[(4,6-dimethyl-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoate
CAS No.
144651-06-9
Molecular Formula
C17H18N4O6S
Molecular Structure
Category
Activity
Herbicide.Oxasulfuron is a short-residual herbicide that has to be applied post-emergence of the crops. It is taken up by the roots and shoots and translocated to the meristematic tissue. Treated weeds die 1-3 weeks after application. Optimum weed control is obtained in damp conditions. Weeds that are not killed are severely stunted and do not compete with the soybean crop. Oxasulfuron is rainfast within four hours of application. A surfactant, such as X-77, should be tank-mixed with the herbicide for optimum activity. Oxasulfuron is safe to rotational crops. Novartis recommends its use in an integrated soybean weed control programme with other pre- and post-emergence products. The product can be tank-mixed with other post-emergence soybean herbicides (including acifluorfen, lactofen and bentazone) although not post-emergence graminicides.
CropUse
CropUses:
soybeans

Soybeans

45-80 g ai/ha

Physical Properties
Molecular weight:406.4g/mol; Physical form:White, odourless powder. Density:1.41; Melting point:158℃ ( decomp.); Vapour pressure:<2 × 10-3 mPa (25 ℃); Henry constant:<3.2 × 10-5 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 0.75 ( pH 5), -0.81 ( pH 7), -2.2 ( pH 8.9); pKa:5.1; Solubility:In water 52 ppm ( pH 5.1, 25℃); in buffer, 63 ( pH 5.0), 1700 ( pH 6.8), 19 000 ( pH 7.8) mg/l (15℃). In methanol 1500, acetone 9300, toluene 320.
Toxicology
Oral:Acute oral LD50 for rats >5000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits >2000 mg/kg. No skin or eye irritation (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: LC50 for rats >5.08 mg/l air. ADI:( JMPR) 0.03 mg/ kg b.w. [1985].
Environmental Profile
WATER SOLUBILITY: 280 g/l at 25 HAZARDS: Fish: LC50 >111 mg/l (bluegill sunfish); >116 mg/l (trout). Bird: Oral LD50 >2250 mg/kg (mallard duck, quail). Bee: Nontoxic. LD50 >25 μg/bee

Bobwhite quail

LD50 >2,250 mg/kg

Mallard duck

LD50 >2,250 mg/kg

Bluegill sunfish [96 hrs]

LC50 >111 mg/litre

Rainbow trout [96 hrs]

LC50 >116 mg/litre

Bee

LD50 >25 μg/bee

Fate in soil:
The half-life of oxasulfuron in soil is less than two weeks. It is degraded microbially and chemically. The rate of degradation is independent of soil conditions.

Fate in aquatic systems:
The half-life of oxasulfuron in aquatic systems is approximately 12 days. Its solubility increases with increasing pH.

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

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