Abstract
The adsorption of As(V) on alumina, hematite, kaolin and quartz has been measured as a function of pH (2 to 10), and As concentrations (10−4 to 10 −8 M; in the alumina and kaolin systems only). The effects of sulfate (0 to 80 mg L−1) and fulvic acid (0 to 25 mg L−1) were studied. The charge of the solid surface and the As speciation in solution (determined by pH) were the most important chemical parameters affecting the sorption behavior. At pH below PZC of the solid, there was a qualitative correlation between the adsorption and the anion exchange capacity of the solid. For hematite at low pH (below 5) there was a reduction of the adsorption possibly related to the formation of positively charged species. The presence of sulfate or fulvic acid reduced the adsorption.
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Xu, H., Allard, B. & Grimvall, A. Influence of pH and organic substance on the adsorption of As(V) on geologic materials. Water Air Soil Pollut 40, 293–305 (1988). https://doi.org/10.1007/BF00163734
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DOI: https://doi.org/10.1007/BF00163734