Abstract
Utilize of property evaluation method for an immobilizing procedure is very important. In this paper, an immobilizing procedure was used to stabilize heavy metals in tested soils. Tessier sequence extract procedure (SEP), toxicity leaching procedure (TCLP) and simple bioaccessibility extraction test (SBET) were used to evaluate the efficiency of the stabilization procedure. The leachability, bioaccessibility and speciation of As, Cu and Pb in the tested soils were analyzed using Tessier SEP, TCLP and SBET method separately. The results indicated that the most active part of the heavy metals could be extracted out by TCLP method and it could be used to evaluate the risk of the tested soils. Tessier method divided heavy metals in soils to different fractions. Monitoring the changes of different fractions during the immobilizing procedure could help fully understand the mechanism of stabilization. The SBET method simulated the human digest system and evaluated the risk changes to human during the immobilizing procedure. And it helped to reveal the potential risk of chemical stability. In our project, these three evaluation method should be utilized properly to help accessing the risk, electing suitable immobilizing method and evaluating the efficiency of stabilization.
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