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Sorption and Desorption of Fipronil in Midwestern Soils

  • Neil A. Spomer
  • Shripat T. Kamble
Article

Abstract

Fipronil, {5-amino-1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-4-[(trifluoromethyl)sulfinyl]-1H-pyrazole-3-carbonitrile} is commonly applied to soil to protect structures against termite infestations. The fate and bioavailability of fipronil in soil is dependent upon the variability of sorption processes and will differ from soil to soil. Adsorption of fipronil to three Nebraska soils with varying organic matter (OM) content was determined. At the concentrations tested (0.025, 0.1, 0.25, 0.5, 1.0, 1.5, and 2.0 mg L−1), adsorption curves showed constant partitioning of fipronil to the soil matrices (r 2 = 0.998 − 0.999). Calculated organic carbon partitioning coefficients (K oc) ranged from 244 to 628 with an average K oc of 396. Reported K d and K f values increased with increasing organic matter content. Desorption hysteresis was observed as fipronil has a propensity to stay in the adsorbed state. After five soil washes with 0.003 M CaCl2, ~30% of adsorbed fipronil residues were desorbed. Reported K oc values for fipronil suggests that it has intermediate mobility in the field collected soils utilized in this study.

Keywords

Adsorption Desorption Fipronil Soil Isotherm 

Notes

Acknowledgments

The authors thank BASF Corp. for providing the 14C-fipronil used in this study. We are grateful to Dr. Steven D. Comfort for his assistance in conducting this research. This article is published as contribution no. 1300, Department of Entomology-Institute of Agriculture and Natural Resources, University of Nebraska, Lincoln.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Department of EntomologyUniversity of NebraskaLincolnUSA

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