Metabolism of Fenitrothion, Parathion and Cyanophos by Isolated Salithion-Degrading Bacteria from Soil

Itoh, Kazuhito

doi:10.1584/jpestics.16.97

Cited by 1 publication

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of the model confirm this hypothesis, since it was impossible to provide a satisfactory fitting for any other type of biodegradation. However, other authors indicate that a specific biomass degrading parathion may exist (Sethunathan and Yoshida, 1973; Barles et al, 1979; Rosenberg and Alexander, 1979; Lal, 1982; Itoh, 1991). Applying repeated treatments of parathion and paraoxon to samples is an experiment that could give more explanations to the type of biodegradation process.…”

Section: Discussionmentioning

confidence: 99%

Modeling of Sorption and Biodegradation of Parathion and Its Metabolite Paraoxon in Soil

Saffih-Hdadi

Bruckler

Barriuso³

2003

J of Env Quality

View full text Add to dashboard Cite

To investigate the distribution of parathion [O,O-diethyl O-(4-nitrophenyl) phosphorothioate] and its highly toxic metabolite paraoxon [O,O-diethyl O-(4-nitrophenyl)phosphate] between the soluble and sorbed pools in the soil, batch experiments were conducted to evaluate the rate of adsorption and desorption of 14C-labeled parathion and paraoxon in soil. The mineralization and degradation of these products were also investigated during a 56-d experiment under controlled laboratory conditions. Adsorption patterns indicated initial fast adsorption reactions occurring within 4 h for both parathion and paraoxon. We also observed the formation of nonextractable residues. The paraoxon was more intensively degraded than the parathion, and production of p-nitrophenol and other metabolites was observed. A kinetic model was developed to describe the sorption and biodegradation rates of parathion, taking into account the production, retention, and biodegradation of paraoxon, the main metabolite of parathion. After fitting the parameters of the model we made a simulation of the kinetics of the appearance and disappearance of paraoxon. From the simulation we predicted a quantity of metabolite in the liquid phase amounting to 1% of the quantity of parathion initially applied. This is in agreement with the experimental data.

show abstract