In this paper, a probe into the stabilization effects of ferrous sulfate (FeSO4) came from two aspects-stabilization efficiency and leachate content. Fe/As molar ratio, arsenic pollution intensity, soil pH, reacted time interval, competitive ions, such as sulfate(SO42-), phosphate(PO43-) and zinc ion(Zn2+), were studied in order to discuss their effects on the stabilization of arsenic. Results show that ,to all different levels of arsenic contaminated soils ,when Fe/As molar ratio reaches 6, arsenic stabilization efficiency exceeds 90%,and arsenic concentration in leachate could also reduce to less than 5 mg/L; in the soil pH range from 8.10 to 8.57,ferrous sulfate has obtained the preferable results, and pH=8.23 is the optimum value; because of existing of competitive actions ,the exogenous adding of SO42-、PO43- and Zn2+ could lead to much poorer performance for FeSO4.
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