Acute, oral toxicity to laboratory animals of fenthion (O-O-dimethyl-O-(3-methyl-4-methyl-mercapto-phenyl)-thiophosphate) in different formulations

The acute, oral toxicity of fenthion (O,O-dimethyl-O-(3-methyl-4-methylmercapto-phenyl)thiophosphate) in different formulations emulgated in water was studied. For male, white rats the approximate values for LD50 found varied from 340 to 560 mg per kg, technical fenthion in commercial products being more toxic than the chemically pure compound. Fenthion in the commercial preparation Lebaycid was more toxic for male, white mice (LD50 approx. 125 mg per kg) than for rats.