Dissipation of fipronil granule formulation in sugarcane field soil

The dissipation and persistence of fipronil in soil was studied following application of fipronil (Regent 0.3G) @ 75 and 300g a.i.ha−1. The limit of quantification for the analysis of fipronil and its metabolites by gas liquid chromatography was 0.001mgkg−1 for soil. The total residues of fipronil a...

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Bibliographic Details
Published in:Ecotoxicology and environmental safety 2013-02, Vol.88, p.142-147
Main Authors: Mandal, Kousik, Singh, Balwinder
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Chromatography, Gas
Ecotoxicology, biological effects of pollution
Fipronil
Fundamental and applied biological sciences. Psychology
gas chromatography
GC–MS
General aspects
GLC
Half-Life
Insecticides - analysis
Insecticides - chemistry
Metabolism
metabolites
oxidation
Oxidation-Reduction
Pyrazoles - analysis
Pyrazoles - chemistry
Residues
Saccharum
Soil
Soil - chemistry
Soil Pollutants - analysis
Soil Pollutants - chemistry
sugarcane
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Summary:The dissipation and persistence of fipronil in soil was studied following application of fipronil (Regent 0.3G) @ 75 and 300g a.i.ha−1. The limit of quantification for the analysis of fipronil and its metabolites by gas liquid chromatography was 0.001mgkg−1 for soil. The total residues of fipronil and its metabolites in soil after 7 days of its application @ 75 and 300g a.i.ha−1 were found to be 0.025 and 0.098mgkg−1, respectively. These residues could not be detected after 210 and 240 days following the application of fipronil at lower and higher dosages, respectively. In soil, fipronil was found to be the main constituent, followed by its metabolites sulfone, sulfide, amide and desulfinyl. The presence of sulfone in significant higher amount as compared to other metabolites in the soil clearly demonstrates that oxidation process plays a major role in the metabolism of fipronil. The half-life values (T1/2) of fipronil were calculated to be 50.2 and 43.0 days, respectively when applied @ 75 and 300g a.i.ha−1. ► Total fipronil residue in soil was found to be 0.025mgkg−1 at lower dose. ► Sulfone was the dominant metabolite followed by sulfide, amide and desulfinyl. ► Residues could not be detected after 240 days when applied @ 300g a.i.ha−1. ► Oxidation process plays a major role in the metabolism of fipronil.
ISSN:0147-6513
1090-2414
DOI:10.1016/j.ecoenv.2012.11.006