Vamidothion [0,0-Dimethyl S-(N-methylcarbamoylethyl thioethy1) 
phosphorothioate ] 
In the urine of mice fed labeled vamidothion, an unknown and the 
hydrolysis products of vamidothion were observed: mono- and di- methyl 
phosphate and inorganic phosphate. These materials were also found in 
the American cockroach and the green rice leafhopper after treatment 
with vamidothion. Rice and apple leaf contained desmethylvamidothion, 
dimethyl phosphate and inorganic phosphate (1039). 
When vamidothion was incubated with a rat liver homogenate, mono- 
and di-methyl phosphate were found. A compound believed to be dimethyl 
phosphorothiolate was also observed. With house fly homogenates, only the 
mono- and di-methyl phosphates were identified (1039). 
VC-13 [0-(2,4-Dichlorophenyl)0,0-diethyl phosphorothioate ] 
Studies have shown that non-hydrolyzed VC-13 residues were greatest 
in fat and fatty tissues of the body and that free 2,4-dichlorophenol, a 
hydrolysis product of VC-13, occurred primarily in the kidney and liver. 
Residues were at a maximum at 7 days after exposure; declined gradually; and 
were eliminated in 6 weeks by cattle and in 8 weeks by sheep and goats. 
Cattle were sprayed with, and sheep and goats were dipped in, solutions 
with the desired concentrations (1532). 
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