Biologically-induced hydrolysis of parathion in soil: Kinetics and modelling

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1016/0038-0717(82)90029-3
Author	Search for: Nelson, Louise M.¹; Search for: Yaron, B.; Search for: Nye, P.H.
Affiliation	National Research Council of Canada. Prairie Regional Laboratory
Format	Text, Article
Abstract	The hydrolysis of the organophosphorus insecticide, parathion (O,O-diethyl O-p-nitrophenyl phosphorothioate) in a silty loam sierozem soil (Gilat, Israel) occurred primarily through microbial action. Parathion (labelled with ¹⁴C in the alkyl chain) was applied at levels of 10–160 μg dry soil¹⁴ to soil remoistened to 20% and incubated at 25°C for 8 days. Bacterial numbers increased to a maximum 4–5 days after application of parathion and the increase was proportional to the concentration of parathion added. The rate of hydrolysis of parathion per μg applied was independent of the concentration of parathion. A model developed to predict the relationship between parathion concentration, microbial numbers and hydrolysis kinetics was in general agreement with the data experimentally obtained. The course of decomposition of successive additions of parathion, determined experimentally and predicted by the model, was characterized by rapid hydrolysis of parathion and successive increases in bacterial numbers. A portion of the ¹⁴C applied in these experiments was strongly absorbed by the soil and was not used by the soil microorganisms during the incubation period tested.
Publication date	1982
Publisher	Elsevier
In	Soil Biology and Biochemistry 14, no. 3 (1982): 223–227.
Language	English
Peer reviewed	Yes
Identifier	0038071782900293 NRCC-19882
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Record identifier	3835a4a4-a4cc-417d-83d6-52487e7e1181
Record created	2023-11-16
Record modified	2023-11-16

Date modified:: 2024-07-19