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Aminomethylphosphonic acid (AMPA) in natural waters and water treatment processes: Sources, behavior and fate

Abstract : The widely occurring degradation product aminomethylphosphonic acid (AMPA) is a result of glyphosate and aminopolyphosphonates (phosphonates) degradation. Massive use of the parent compounds leads to the ubiquity of AMPA in the environment, and particularly in water. The purpose of this review is to summarize and discuss current insights into AMPA formation, transport, persistence and toxicity. In agricultural soils, AMPA is concentrated in the topsoil, and degrades slowly in most soils. It can reach shallow groundwater, but rarely managed to enter deep groundwater. AMPA is strongly adsorbed to soil particles and moves with the particles towards the stream in rainfall runoff. In urban areas, AMPA comes from phosphonates and glyphosate in wastewater and/or storm sewers according to the configuration of the network (combined or separative). It is commonly found at the outlets of Wastewater Treatment Plants (WWTP). Soils and Sediments tend to accumulate AMPA, where it may be biodegraded while limited photodegradation in waters exists. Airborne AMPA is not negligible, but does wash-out with heavy rainfall. AMPA is reported to be persistent and can be biologically degraded in soils and sediments. Thus AMPA mainly has its sources in agricultural leachates and urban wastewater effluents. The domestic contribution of AMPA via glyphosate is negligible while the contribution via phosphonates remains unclear. There is a critical lack of epidemiological data - especially on water exposure - to understand the toxicological effects, if any, of AMPA on humans. Fortunately, well operated water treatment plants remove a significant proportion of the AMPA from water, even though there are not sufficient regulatory limits for metabolites.
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Submitted on : Monday, June 28, 2021 - 5:03:10 PM
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S. Piel, A. Grandcoin, Estelle Baurès. Aminomethylphosphonic acid (AMPA) in natural waters and water treatment processes: Sources, behavior and fate. Techniques Sciences Méthodes , ASTEE/EDP Sciences, 2019, 114 (4), pp.45-58. ⟨10.1051/tsm/201904045⟩. ⟨hal-03272929⟩



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