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Adsorption and detoxification of glyphosate and aminomethylphosphonic acid by montmorillonite clays

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Abstract

The co-occurrence of mixtures of glyphosate (GLP) and aminomethylphosphonic acid (AMPA) in contaminated water, soil, sediment, and plants is a cause for concern due to potential threats to the ecosystem and human health. Major routes of exposure include contact with contaminated water and soil and through consumption of crops containing GLP and AMPA residues. Calcium montmorillonite (CM) and acid-processed montmorillonite (APM) clays were investigated for their ability to tightly sorb and detoxify GLP and AMPA mixtures. In vitro adsorption and desorption isotherms and thermodynamic analysis indicated saturable Langmuir binding of both chemicals with high capacities, affinities, enthalpies, and free energies of sorption and low desorption rates. In silico computational modeling indicated that both GLP and AMPA can be readily absorbed onto clay surfaces through electrostatic interactions and hydrogen bonding. The safety and efficacy of the clays were confirmed using well-established living organisms, including an aquatic cnidarian (Hydra vulgaris), a soil nematode (Caenorhabditis elegans), and a floating plant (Lemna minor). Low levels of clay inclusion (0.05% and 0.2%) in the culture medium resulted in increased growth and protection against chemical mixtures based on multiple endpoints. Results indicated that montmorillonite clays may be used to bind mixtures of GLP and AMPA in water, soil, and plants.

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The raw data that support the findings of this study are available from the corresponding author, upon request.

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Funding

This work was supported by the NIEHS SRP (Superfund Hazardous Substance Research and Training Program) P42 ES027704; and the USDA Hatch 6215.

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  1. Veterinary Integrative Biosciences Department, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4458, USA

    Meichen Wang, Kelly J. Rivenbark & Timothy D. Phillips

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Timothy Phillips: conceptualization, funding acquisition, methodology, project administration, resources, supervision, validation, visualization, writing — review and editing.

Meichen Wang: formal analysis, investigation, software, writing — original draft.

Kelly Rivenbark: formal analysis, investigation, software, writing — original draft.

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Correspondence to Timothy D. Phillips.

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Wang, M., Rivenbark, K.J. & Phillips, T.D. Adsorption and detoxification of glyphosate and aminomethylphosphonic acid by montmorillonite clays. Environ Sci Pollut Res 30, 11417–11430 (2023). https://doi.org/10.1007/s11356-022-22927-8

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