The metabolism and distribution of [14c-phenyl]-ethyl parathion in a tropical soil under field conditions
Date
1998Author
Wandiga, Shem O.
Lalah, Joseph O.
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
The persistence, distribution and metabolism of [14C-phenyl]-ethyl parathion applied to soil
columns in an agricultural farm were investigated under tropical field conditions. Volatilization,
soil microbial activity, moisture levels and pH were found to influence the persistence, distribution
and metabolism of this pesticide in the soil. There was rapid distribution of the pesticide in
the soil matrix with time resulting in high levels of bound residues which reduced the overall rate
of disappearance of parathion residues from the soil. The soil was slightly acidic but the metabolites,
paraoxon, p-nitrophenol and p-aminophenol were detected in the soil extracts 7 days after
pesticide application. After 72 days, 43.7% of the applied pesticide remained in soil composed of
18.9% extractable and 24.8% bound residues. A mechanism for the metabolism of ethyl parathion
in this soil is given.
Citation
Toxicological and Environmental Chemistry, Vol. 69, pp. 459-468Publisher
Department of Chemistry, University of Nairobi