Abstract
It is generally assumed that the sorption of a nonionic pesticide on soil depends mainly on the content of soil organic matter (SOM); however, there are other factors that can contribute to this process. The possible causes of variation in the carbon-normalized partition coefficient (K OC) for chlorpyrifos (CPF) for a diverse set of ten soils have been investigated. On the one hand, the analysis of the chemical composition of the SOM was analyzed, and on the other hand, the likely interactions between the organic matter and the mineral phase were assessed. Sorption experiments of CPF were performed on whole soil, on soils treated with 2% hydrofluoric acid (HF), and onto calcined soil at 550 °C. Organic matter chemistry of soil was determined by 13C CP/MAS NMR spectroscopy; K OC values were positively correlated with aryl C relative proportion and negatively correlated with alkyl C and O-aryl C proportions and prediction equation of K OC was found (R 2 = 0.82, p < 0.001). To evaluate possible organo-mineral interactions, a mathematical model was proposed which calculates the concentration of CPF at equilibrium (C cal) considering adsorption coefficients for the organic (K DHF) and inorganic (K D550 °C) soil constituents, separately. The comparison between C cal and the equilibrium concentration obtained from experimental data (C exp) onto whole soil allowed us to confirm that interactions between the OM and clay affect the adsorption of CPF in whole soil. Such findings should be taken into account in the development of predictive models for the evaluation of the fate and transport of this pesticide in soil.
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Acknowledgments
The authors are grateful to the Secretaría de Ciencia y Técnica, Universidad Nacional del Comahue, Argentina, for the financial support. We also thank to Dra. Heike Knicker (Departament of Geoecología, Biogeoquímica y Microbiología Ambiental Instituto de Recursos Naturales y Agrobiología, Sevilla (IRNAS-CSIC) for her help in obtention and interpretation of 13C-NMR spectra.
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Savini, M.C., Loewy, R.M., Nicotra, V.E. et al. Contribution of Soil Components on the Sorption of Chlorpyrifos. Water Air Soil Pollut 228, 36 (2017). https://doi.org/10.1007/s11270-016-3153-z
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DOI: https://doi.org/10.1007/s11270-016-3153-z