Abstract
The purpose of this study reports chemical immobilization of As in contaminated soil, using ferric sulfate (Fe2(SO4)3) and ferric chloride hexahydrate (FeCl3·6H2O) as stabilizing agents. The optimum treatment solutions were identified based on the immobilizing efficiency of water-soluble and NaHCO3-extractable arsenic. The results showed significant decreases of water and NaHCO3-extractable arsenic in soil. Optimization of technological parameters: dosage, treatment time and soil moisture, on arsenic remediation were studied. The immobilization efficiency of NaHCO3-extractable As attained 83.64% with using 5.5% Fe2(SO4)3, meanwhile that of As could reach 74.50% with adding the same ratio of FeCl3·6H2O. The relationship between As immobilization effects and reaction time indicated that arsenic mobility obtained stability after 7 days treatment. Simultaneously, moisture had slightly influence on chemical stabilization, while the immobilization efficiency of ferric chloride hexahydrate was relatively higher under less moisture content. However, soil pH value decreased with the amount of stabilizing agents increasing, which limited the mass ratio of fixative/soil cannot to be much high during treating process.
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