Ottosen L M, Hansen H K, Ribeiro A B, Villumsen A
Department of Geology and Geotechnical Engineeing, Building 204, Technical University of Denmark, 2800, Lyngby, Denmark.
J Hazard Mater. 2001 Aug 17;85(3):291-9. doi: 10.1016/s0304-3894(01)00231-x.
The pH dependency of the removal of Cu, Zn and Pb by electrodialytic soil remediation from different industrially polluted soils was examined. From 18 experiments performed with five different soils, it was found that the order of mobilization due to a pH decrease was Zn>Cu>Pb. It was found, too, that each of the elements was removed at higher soil pH in calcareous soils (about 12% carbonates) than in soils with a carbonate content of less than 3.7%. In soils rich in carbonates, precipitation of heavy metal carbonates is an important retention mechanism and the heavy metal carbonates are dissolved at higher pH values than the pH at which heavy metals are desorbed in non-calcareous soils. Thus, the relation between the soil pH and the mobility of the heavy metal in the electric field is not only dependent on the heavy metal in focus, but also on the fraction of the heavy metal precipitated as carbonates.
研究了电渗析土壤修复法对不同工业污染土壤中铜、锌和铅的去除效果与pH值的关系。通过对五种不同土壤进行的18次实验发现，由于pH值降低而导致的迁移顺序为锌>铜>铅。还发现，在石灰性土壤（约含12%碳酸盐）中，每种元素在较高土壤pH值下的去除量都高于碳酸盐含量低于3.7%的土壤。在富含碳酸盐的土壤中，重金属碳酸盐的沉淀是一种重要的保留机制，并且重金属碳酸盐在高于非石灰性土壤中重金属解吸时的pH值下溶解。因此，土壤pH值与电场中重金属迁移率之间的关系不仅取决于所关注的重金属，还取决于以碳酸盐形式沉淀的重金属比例。
