Decreased bioavailability of aminomethylphosphonic acid(AMPA) in genetically mod

本文刊于: 《Journal of Environmental Sciences》 2021年第0期

关键词:
Glyphosate AMPA Activatedcarbon Calciumm

Keywords:
Glyphosate,AMPA,Activated carbon,Calcium montmorillonite,Sorbent
摘要
     The widespread use of pesticides has resulted in detectable residues throughout the environment, sometimes at concentrations well above regulatory limits. Therefore, the development of safe, effective, field-practical, and economically feasible strategies to mitigate the effects of pesticides is warranted. Glyphosate is an organophosphorus herbicide that is degraded to aminomethylphosphonic acid(AMPA), a toxic and persistent metabolite that can accumulate in soil and sediment and translocate to plants. In this study, we investigated the binding efficacy of activated carbon(AC) and calcium montmorillonite(CM) clay to decrease AMPA bioavailability from soil and AMPA translocation to plants. Adsorption isotherms and thermodynamic studies on AC and CM were conducted and showed tight binding(enthalpy values >-20 k J/mol) for AMPA with high capacities(0.25 mol/kg and 0.38 mol/kg, respectively), based on derivations from the Langmuir model. A hydra assay was utilized to indicate toxicity of AMPA and the inclusion of 1% AC and CM both resulted in 90% protection of the hydra( * *p ≤ 0.01). Further studies in glyphosate-contaminated soil showed that AC and CM significantly reduced AMPA bioavailability by 53% and 44%, respectively. Results in genetically modified(GM) corn showed a conversion of glyphosate to AMPA in roots and sprouts over a 10-day exposure duration. Inclusion of AC and CM reduced AMPA residues in roots and sprouts by 47%–61%. These studies collectively indicate that AC and CM are effective sorbents for AMPA and could be used to reduce AMPA bioavailability from soil and AMPA residues in GM corn plants.

基金项目:
supportedbyfundingthroughNIEHSSRP(SuperfundHazardousSubstanceResearchandTrainingProgram),P42ES0277704,andUSDAHatch6215

上一篇:Dairy manure as a potential source of crop nutrients and environmental contamina
下一篇:Watering techniques and zero-valent iron biochar pH effects on As and Cd concent

分享到: 分享Decreased bioavailability of aminomethylphosphonic acid(AMPA) in genetically mod到腾讯微博           收藏
评论排行
公告 
相关期刊文献推荐
相关会议文献推荐
相关硕士文献推荐
相关博士文献推荐