Kinetics of glyphosate and aminomethylphosphonic acid sorption onto montmorillonite clays in soil and their translocation to genetically modified corn  

作　　者：Meichen Wang Kelly J Rivenbark Timothy D Phillips 

机构地区：[1]Veterinary Physiology and Pharmacology,College of Veterinary Medicine and Biomedical Sciences,Texas A&M University,TX 77845,USA

出　　处：《Journal of Environmental Sciences》2024年第1期669-680,共12页环境科学学报（英文版）

基　　金：supported by funding through NIEHS P42ES027704,R43 ES035325,and K99ES034090,and USDA Hatch6215。

摘　　要：The co-occurrence 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.A major route of exposure is through contact with contaminated soil and consumption of crops containing GLP and AMPA residues.However,clay-based sorption strategies for mixtures of GLP and AMPA in soil,plants and garden produce have been very limited.In this study,in vitro soil and in vivo genetically modified corn models were used to establish the proof of concept that the inclusion of clay sorbents in contaminated soils will reduce the bioavailability of GLP and AMPA in soils and their adverse effects on plant growth.Effects of chemical concentration(1–10 mg/kg),sorbent dose(0.5%-3%in soil and 0.5%-1%in plants)and duration(up to 28 days)on sorption kinetics were studied.The time course results showed a continuous GLP degradation to AMPA.The inclusion of calcium montmorillonite(CM)and acid processed montmorillonite(APM)clays at all doses significantly and consistently reduced the bioavailability of both chemicals from soils to plant roots and leaves in a dose-and time-dependent manner without detectable dissociation.Plants treated with 0.5%and 1%APM inclusion showed the highest growth rate(p≤0.05)and lowest chemical bioavailability with up to 76%reduction in roots and57%reduction in leaves.Results indicated that montmorillonite clays could be added as soil supplements to reduce hazardous mixtures of GLP and AMPA in soils and plants.

关 键 词：GLYPHOSATE AMPA Adsorption Soil remediation Plant Hydroponic system 

分 类 号：X505[环境科学与工程—环境工程]