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Carbendazim
Common name: Carbendazim
IUPAC name: methyl benzimidazol-2-ylcarbamate
Chemical Abstracts name:methyl 1H-benzimidazol-2-ylcarbamate
CAS RN:[10605-21-7]
 
PHYSICAL CHEMISTRY
Mol. wt.: 191.2
Form:    Crystalline powder.                           
M.p.: 302-307 ºC (decomp.)  
V.p.: 0.09 mPa (20 ºC); 0.15 mPa (25 ºC); 1.3 mPa (50 ºC); separate study gives <0.0001 mPa (20 ºC)  
Kow logP = 1.38 (pH 5), 1.51 (pH 7), 1.49 (pH 9)
Henry: 3.6×10-3 Pa m3 mol-1 (calc.)
S.g./density: 1.45 (20 ºC)
Solubility  In water 29 mg/l (pH 4), 8 mg/l (pH 7), 7 mg/l (pH 8) (24 ºC). In dimethylformamide 5, acetone 0.3, ethanol 0.3, chloroform 0.1, ethyl acetate 0.135, dichloromethane 0.068, benzene 0.036, cyclohexane <0.01, diethyl ether <0.01, hexane 0.0005 (all in g/l, 24 ºC).
Stability  Decomposes at m.p.; stable for at least 2 y below 50 ºC. Stable after 7 d at 20 000 lux. Slowly decomposed in alkaline solution (22 ºC); DT50 >350 d (pH 5 and pH 7), 124 d (pH 9). Stable in acids, forming water-soluble salts.
 
TOXICOLOGY
Oral Acute oral  LD50 for rats >15 000, dogs >2500 mg/kg.
Skin and eye Acute percutaneous  LD50 for rabbits >10 000, rats >2000 mg/kg. Non-irritating to skin and eyes (rabbits). Not a skin sensitiser (guinea pigs).
Inhalation LC50 (4 h) for rats, rabbits, guinea pigs or cats, no effect with suspension (10 g/l water).
NOEL (2 y) for dogs 300 mg/kg diet, corresponding to 6-7 mg/kg b.w.
ADI (JMPR) 0.03 mg/kg b.w. Other Acute i.p. LD50 for male rats 7320, female rats 15 000 mg/kg.
Toxicity class WHO (a.i.) III
EC hazard R40
 
ECOTOXICOLOGY
Birds Acute oral   LD50 for quail 5826-15 595 mg/kg.
Fish  LC50 (96 h) for carp 0.61, rainbow trout 0.83, bluegill sunfish >17.25, guppy >8 mg/l.
Daphnia  LC50 (48 h) 0.13-0.22 mg/l.
Algae  EC50 (72 h) for Scenedesmus subspicatus 419, Selenastrum capricornutum 1.3 mg/l.
Bees  LD50 (contact) >50 mg/bee.
Worms  LC50 (4 w) for Eisenia foetida 6 mg/kg soil. 
 

 
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