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Biological Hydrolysis of Parathion in Natural Ecosystems¹

ABSTRACT

Parathion (O, O-diethyl O,p-nitrophenyl phosphorothioate) was applied to flooded soils and to water and sediment river, lake, and pond samples at 15-day intervals. While p-nitrophenol (O, O-dimethyl O,p-nitrophenyl phosphorothioate), the hydrolysis product of parathion, was not detected, even at the end of 12 days after the first addition, it was detected in all samples within 6 hours after two or three additions of the insecticide. Enrichment cultures from the samples of different ecosystems lost their ability to hydrolyze parathion following auto-claving, suggesting microbial participation in parathion hydrolysis.

Key Words: flooded soil • organophosphorus insecticides • water pollution

¹ Contribution from the Lab. of Soil Microbiol., Central Rice Res. Inst., Cuttack-753006, India. This work was supported, in part, by funds from the Dep. of Sci. and Technol., Government of India.

² Research Fellow and Soil Microbiologist, respectively.

Received for publication July 18, 1977.