Abstract
Some industrial sites have contaminated surface soils with arsenic (As) concentrations significantly above those that can be stabilized through natural soil mechanisms. A review of the chemistry of arsenic in the soil environment indicates that is possible to stabilized this element by reacting it with amorphous iron oxides. The addition of ferrous sulfate proved to be effective in reducing water-soluble As and its leachability in arsenic-contaminated soil from a pesticide manufacturing industrial site. Soil samples containing up to 4.2% total As, and more than 2.5 g L −1 water soluble and readily leachable As, had these As forms significantly reduced after just three 24-hour wet-dry cycles. The efficiency and potential reversibility of this treatment under extreme field conditions remains to be tested.
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