An approach for arsenic in a contaminated soil: Speciation, fractionation, extraction and effluent decontamination |
| |
Authors: | A Giacomino O Abollino M Velayutham E Mentasti |
| |
Institution: | a Department of Analytical Chemistry, University of Torino, Via Pietro Giuria 5, 10125 Torino, Italy b Anna University, Chennai 600 025, India |
| |
Abstract: | The fractionation and speciation of As in a contaminated soil were investigated, and a remediation strategy was tested. Regarding speciation, we found that As(V) prevails over As(III) whereas more than 40% of total arsenic is in organic form. The fractionation of As was investigated with two sequential extraction methods: a low mobility was found. Then we tested the possibility of using phosphoric acid to extract As from the soil and cleaning the washing effluents by sorption onto montmorillonite. The efficiency of the extraction and of the adsorption onto the clay were also investigated for Cr, Cu, Fe, Mn, Ni, Pb and Zn, whose total concentrations and fractionation in the soil are reported here. The extraction percentages for As and metals ranged from 30 to 65%; the residual proportions in the soil are presumably in very unreactive forms. Montmorillonite showed a good uptake capacity towards the investigated pollutants. |
| |
Keywords: | Arsenic Speciation Fractionation Soil washing Montmorillonite |
本文献已被 ScienceDirect 等数据库收录! |
|