Kumpiene Jurate, Ore Solvita, Renella Giancarlo, Mench Michel, Lagerkvist Anders, Maurice Christian
Division of Waste Science and Technology, Luleå University of Technology, Luleå SE-97187, Sweden.
Environ Pollut. 2006 Nov;144(1):62-9. doi: 10.1016/j.envpol.2006.01.010. Epub 2006 Mar 6.
Stabilization of soil contaminated with trace elements is a remediation practice that does not reduce the total content of contaminants, but lowers the amounts of mobile and bioavailable fractions. This study evaluated the efficiency of Fe(0) to reduce the mobility and bioavailability of Cr, Cu, As and Zn in a chromated copper arsenate (CCA)-contaminated soil using chemical, biochemical and biotoxicity tests. Contaminated soil was stabilized with 1% iron grit. This treatment decreased As and Cr concentrations in leachates (by 98% and 45%, respectively), in soil pore water (by 99% and 94%, respectively) and in plant shoots (by 84% and 95%, respectively). The stabilization technique also restored most of analyzed soil enzyme activities and reduced microbial toxicity, as evaluated by the BioTox test. After stabilization, exchangeable and bioaccessible fractions of Cu remained high, causing some residual toxicity in the treated soil.
稳定受微量元素污染的土壤是一种修复措施，它不会降低污染物的总量，但会减少可移动和生物可利用部分的含量。本研究使用化学、生化和生物毒性测试评估了零价铁降低铬化砷酸铜（CCA）污染土壤中铬、铜、砷和锌的迁移性和生物有效性的效率。用1%的铁砂对污染土壤进行稳定化处理。该处理降低了渗滤液中砷和铬的浓度（分别降低了98%和45%）、土壤孔隙水中砷和铬的浓度（分别降低了99%和94%）以及植物地上部分中砷和铬的浓度（分别降低了84%和95%）。如通过生物毒性测试所评估的，这种稳定化技术还恢复了大部分分析的土壤酶活性，并降低了微生物毒性。稳定化处理后，铜的可交换和生物可及部分仍然很高，导致处理后的土壤存在一些残留毒性。
