Specification :

Chlorsulfuron

Common name: chlorsulfuron
IUPAC name: 1-( 2-chlorophenylsulfonyl) -3-( 4-methoxy-6-methyl-1, 3, 5-triazin-2-yl) urea
Che mical Abstracts name: 2-chloro-N-[ [ ( 4-methoxy-6-methyl-1, 3, 5-triazin-2-yl) amino] carbonyl] benzenesu lfonamide
CAS RN: [ 64902-72-3]

PHYSICAL CHEMISTRY
Mol. wt.: 357.8; M.f.: C12H12ClN5O4S; Form: White crystalline solid. M.p.: 174-178 ° C. V.p.: 3x10-6 mPa ( 25 º C) . KOW: logP = -0.99 ( pH 7) . Henry: 3.0x10-9 Pa m3 mol-1 S.g./ density: 1.48; Solubility: In water 587 ppm ( pH 5) , 3.18 g/ 100g ( pH 7) ( both 25 º C) . In dichloromethane 1.4, acetone 4, methanol 15, toluene 3, hexane 5000 mg/ kg. Dietary LC50 ( 8 d) for mallard ducks and bobwhite quail > 5000 mg/ kg diet.
Fish: LC50 ( 96 h) for rainbow trout > 250, bluegill sunfish > 300 mg/ l. LC50 for fathead minnow > 300, catfish > 50, sheepshead minnow > 980 mg/ l.
Daphnia: LC50 ( 48 h) 370 mg/ l.
Bees: LD50 ( contact) > 25 ug/ bee.
Worms: LC50 > 2000 mg/ kg.

ENVIRONMENTAL FATE
Soil/ Environment: In soil, deactivation is through hydrolysis followed by complete metabolism to low-molecular-weight compounds through normal soil microbial processes. Rate of hydrolysis is increased at lower pH. Average half-life under growing-season conditions is c. 4-6 weeks. Koc 40 ( pH 7) .