How crucial is the impact of calcium on the reactivity of iron-organic matter aggregates? Insights from arsenic
作者： Anthony Beauvois , Delphine Vantelon , Jacques Jestin , Martine Bouhnik-Le Coz , Charlotte Catrouillet
DOI: 10.1016/J.JHAZMAT.2020.124127
关键词: Metal 、 Organic matter 、 Reactivity (chemistry) 、 Calcium 、 Ionic strength 、 Ferrihydrite 、 Arsenic 、 Chemical engineering 、 Sorption 、 Chemistry
摘要: Environmental iron-organic matter (Fe-OM) aggregates play a major role in the dynamic of pollutants. Nowadays, there is lack information about control exerted by their structural organization on reactivity towards metal(loid)s and particular, impact ions, such as calcium. The sorption capacity mimetic environmental Fe-OM-Ca was investigated relative to Fe/organic carbon (OC) Ca/Fe ratios using As probe. It shown that Fe speciation key factor controlling regarding high affinity Fe(III)-oligomers ferrihydrite-like nanoparticles. Moreover, when it occurs at concentration, Ca competes with for OM binding leading an increase amount nanoparticles site availability. consequence, not only impacts ionic strength but also has dramatic Fe-OM several scales organization, resulting capacity. In presence amounts Ca, could immobilize pollutants soil porous media they form micrometric network exhibiting strong
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