科研之友
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摘要
The research progresses of leaching agents in the remediation of heavy metal contaminated soils were reviewed with focused on three different pollution types, including the soils mainly contaminated by cadmium (Cd) and lead (Pb) of the same category, by arsenic (As), and by the combination of the first two types of heavy metals. In general, the chelating agent for the first type of polluted soil showed higher removal efficiency, especially for GLDA (Glutamic acid, N, N-Diacetic acid), citric acid and so on, which were environment friendly either. For the second type of soil mainly contaminated by As, the removal rate of composite washing agent (CWA) was relatively high like NaOH-EDTA (NaOH-Ethylenediamine tetraacetic acid). In particular, the CWAs, just like NaOH-H3PO4, was with very high removal rates compared to the single washing agents for the third type polluted soil. It was suggested that the CWAs with higher removal efficiency for several heavy metals in soil together and less secondary pollution will be the key research points in the future.
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