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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3002
Title: Decay profile and metabolic pathways of quinalphos in water, soil and plants
Authors: Gupta B.
Rani M.
Kumar R.
Dureja P.
Published in: Chemosphere
Abstract: The widespread occurrence of pesticide residues in different agricultural and food commodities has raised concern among the environmentalists and food chemists. In order to keep a proper track of these materials, studies on their decay profiles in the various segments of ecosystem under varying environmental conditions are needed. In view of this, the metabolites of quinalphos in water and soil under controlled conditions and in plants, namely tomato and radish in field conditions have been analysed and possible pathways suggested. In order to follow the decay of the pesticide, an HPLC procedure has been developed. Studies conducted in water at different temperatures, pH and organic content reveal that the persistence of the pesticide decreases with the increase in all the three variables. In the three different types of soils studied, the effect of pH is more or less apparent on a similar line. On an average a faster decay is observed in the case of plants than in water and soil. The decay profiles in all these cases follow first order kinetics. The metabolites were identified by GC-MS. The investigations reflect that degradation occurs through hydrolysis, S-oxidation, dealkylation and thiono-thiol rearrangement. The pathways seem to be complex and different metabolites were observed with the change in the matrix. Quinalphos oxon, O-ethyl-O-quinoxalin-2-yl phosphoric acid, 2-hydroxy quinoxaline and quinoxaline-2-thiol were observed in all the matrices. Results further indicate that the metabolites, 2-hydroxy quinoxaline and oxon, which are more toxic than parent compound, persist for a longer time. © 2011 Elsevier Ltd.
Citation: Chemosphere (2011), 85(5): 710-716
URI: https://doi.org/10.1016/j.chemosphere.2011.05.059
http://repository.iitr.ac.in/handle/123456789/3002
Issue Date: 2011
Keywords: Chromatography
Degradation
Metabolic products
Quinalphos
ISSN: 456535
Author Scopus IDs: 7402195167
56363756800
55492126800
7003329145
Author Affiliations: Gupta, B., Analytical Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Rani, M., Analytical Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Kumar, R., Analytical Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Dureja, P., Division of Agricultural Chemicals, India Agricultural Research Institute, New Delhi, India
Funding Details: The authors would like to acknowledge Council of Scientific and Industrial Research (CSIR), India for financial assistance.
Corresponding Author: Gupta, B.; Analytical Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667 (UK), India; email: bvgcyfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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