The As release from coprecipitation products naturally formed in Bangladesh groundwaters was compared with that from synthetic Fe-As precipitates. Iron oxy(hydr)oxides were the main component of all materials, but the natural coprecpitates also contained carbonates, phosphates and microbial organic matter. Synthetic coprecipitation products released more As than the natural ones with several diluted extractants. Kinetics of As release from synthetic Fe-As coprecipitates, evidenced an hindrance in As mobilization when a coverage of Ca-polygalacturonate was introduced. Hence, the organic interface could be a key-factor in affecting the stability of such systems.
Arsenic mobility in natural and synthetic coprecipitation products
Martin M.;Balint R.;Gorra R.;Celi L.;Barberis E.;
2016-01-01
Abstract
The As release from coprecipitation products naturally formed in Bangladesh groundwaters was compared with that from synthetic Fe-As precipitates. Iron oxy(hydr)oxides were the main component of all materials, but the natural coprecpitates also contained carbonates, phosphates and microbial organic matter. Synthetic coprecipitation products released more As than the natural ones with several diluted extractants. Kinetics of As release from synthetic Fe-As coprecipitates, evidenced an hindrance in As mobilization when a coverage of Ca-polygalacturonate was introduced. Hence, the organic interface could be a key-factor in affecting the stability of such systems.
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