Influence of glyphosate and AMPA on the extractability of trace elements in uncontaminated and contaminated soils
(2022) Young Soil Scientists Day 2022 — Location: Brussels (31.March.2022)
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- Authors
Bemelmans, Nathan 
Arbalestrie, Bryan
- Abstract
- Glyphosate is among the most broadly used herbicides around the world and has become controversial due to human health risks. In addition to its well-known herbicidal function, glyphosate has the capacity to chelate trace elements. Yet, agricultural soils may be contaminated by trace elements to various degrees raising the question of a possible enhancement of their mobility because of glyphosate and his major degradation product aminomethylphosphonic acid (AMPA). The potentially enhanced extractability of trace elements with glyphosate and AMPA has been studied by batch experiments where the trace elements are extracted from the soil (transferred from soil to solution) using an extracting solution containing an active substance. In our study, four agricultural soils have been selected: one soil is uncontaminated, two soils are anthropogenically contaminated, and the last one is naturally contaminated. While glyphosate enhanced the extractability of many elements (Cu, As, Zn, Cd…), AMPA mainly enhanced the extractability of As and decreased the mobility of other elements (Ba, Zn, Sn). Results depend on the considered soil and active substance concentration. Results also show that the commercial glyphosate-based pesticide is leading to a higher extractability of the trace elements than glyphosate alone in all soils except the uncontaminated one. Thus, glyphosate can be considered as a possible cause of the increase of trace element mobility, especially in the top layers where pesticide concentrations can be relatively high.
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Citations
Bemelmans, N., Arbalestrie, B., & Agnan, Y. (2022). Influence of glyphosate and AMPA on the extractability of trace elements in uncontaminated and contaminated soils. Young Soil Scientists Day 2022, Brussels. https://hdl.handle.net/2078.5/108667