Removing heavy metals from contaminated clay soils by extraction with hydrochloric acid, edta or hypochlorite solutions
作者： B.J.W. Tuin , M. Tels
DOI: 10.1080/09593339009384958
关键词: Extraction (chemistry) 、 Hydrochloric acid 、 Soil contamination 、 Human decontamination 、 Environmental engineering 、 Soil water 、 Hypochlorite 、 Metal 、 Chromium 、 Chemistry 、 Nuclear chemistry 、 Waste Management and Disposal 、 Water Science and Technology 、 Environmental chemistry 、 General Medicine
摘要: Abstract Removal efficiencies of six heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) from contaminated clay soils were measured In batchwise extractions. Between 80 9054 Cd, Zn could be extracted by hydrochloric acid (HC1) treatment (repeated extractions with 0.1 N or a single one 2 N). N1 extraction percentages varied between 45 8054. A concentration above HC1 will necessary to clean the maximum tolerable metal levels. This cause severe damage original soil structure. successful EDTA required suspension pH below 4. Only Cd removed levels comparable treatments. Chromium hardly EDTA. Treatment hot 0.46 M sodium hypochlorite solution at pH=8.5 gave greatest chromium release compared other, tested extractants: 70–8554 Cr removal.
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