Abstract
Adsorption of the herbicide glyphosate and its main metabolite AMPA (aminomethylphosphonic acid) was investigated on 17 different agricultural soils. Batch equilibration adsorption data are shown by Freundlich adsorption isotherms. Glyphosate adsorption is clearly affected by equilibration concentrations, but the nonlinear AMPA adsorption isotherms indicate saturation of the adsorption sites with increasing equilibrium concentrations. pHCaCl2 (i.e. experimental pH) is the major parameter governing glyphosate and AMPA adsorption in soils. However, considering pHCaCl2 values, available phosphate amount, and amorphous iron and aluminium oxide contents by using a nonlinear multiple regression equation, obtains the most accurate and powerful pedotransfer rule for predicting the adsorption constants for these two molecules. As amorphous iron and aluminium oxide contents in soil are not systematically determined, we also propose a pedotransfer rule with two variables—pHCaCl2 values and available phosphate amount—that remains acceptable for both molecules. Moreover, the use of the commonly measured pHwater or pHKCl values gives less accurate results compared to pHCaCl2 measurements. To our knowledge, this study is the first AMPA adsorption characterization for a significant number of temperate climate soils.
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Acknowledgments
The research was funded by the Rhône-Méditerranée, the Corsica Water Board (Agence de l’Eau RMC) and BRGM within the framework of the PENATH research project. Dr H.M. Kluijver revised and edited the English text.
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Highlights
• Our study provides the first AMPA adsorption data for temperate climate soils.
• We used nonlinear multiple regression to correlate K f values and soil properties
• Only four variables allow explaining more than 92 % of glyphosate and AMPA adsorption.
• Of these four, pHCaCl2 is the most reliable explanatory variable for both molecules.
• Neither pHwater nor pHKCl are relevant variables for pedotransfer determination.
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Sidoli, P., Baran, N. & Angulo-Jaramillo, R. Glyphosate and AMPA adsorption in soils: laboratory experiments and pedotransfer rules. Environ Sci Pollut Res 23, 5733–5742 (2016). https://doi.org/10.1007/s11356-015-5796-5
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DOI: https://doi.org/10.1007/s11356-015-5796-5