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Bensulfuron-methyl |
| chemical name: |
methyl 2-[[[[[(4,6-dimethoxypyrimidin-2-yl)-amino] carbony]=
amino]sulfonyl]methyl]benzoic acid |
| Molecular weight: |
140.4
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| Molecular formular: |
C16H18N407S |
Mode of action: |
Selective systemic herbicide, absorbed by the foliage and roots,
With rapid translocation to the meristematic tissues. |
Uses: |
Selective pre-and post-emergence control of annual and perennial weeds
And sedges in continuously flooded ric at 30-100 g/ha. |
Physical chemistry: |
Form: White to pale yellow , odourless solid. Melting point:185-188℃. Vapour pressure:2.8x10-9 mPa(25℃) . Kow logP=2.45(pH 1.5),0.62(pH 7),(both and 30℃). Henry 1.4×10-11 Pa m3 mol-1. S.g./density:1.41. Solubility: In water 2.9(pH 5), 12(pH 6) 120 (pH 7), 1200 (pH 8)( all in mg/l 25℃ In acetone 1.38,acetonitrile 5.38, dichloromethane 11.7, ethyl acetate 1.66, hexane> 0.01, xylene 0.280( all in g/l 20℃)..Stability Aqueous salutation are most stable under
Slight alkaline conditions (pH 8) and slowly degrade under acidic conditations. pKa 5.2. |
Mammalian toxicology: |
Oral Acute oral LD50 for rats>5000,mice >10985 mg/kg,. Skin and eye Acute percutaneous LD50 for rabbits >2000mg/kg. Non-irritant to skin and
Eyes.Inhalation LC50(4h) for rats >7.5 mg/l air. NOEL (2 y) for rats 750 mg/kg diet;
Teratogenicity NOEL in rats 500, rabbits 300mg/kg Not a mutagen ADI 0.2 mg/kg . Toxicity class WHO (a.i.) III (Table 5), EPA (formulation)IV EC hazard ;R43|R51,R53 |
Ecotoxicology: |
Birds Acute oral LD50 for mallard ducks > 2510mg/kg. Eight day dietary LC50 For bobwhite quail and mallard ducks> 5620 mg/l..Fish LC50 (96 h) for rainbow trout > 150mg/l LC5048 h) > 1000ppm Daphnia LC50(48 h) >100 mg/l. . Bees LD50>12.5 µg/bee. |
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