改性Mg(OH)2对多种重金属污染土壤的修复效果

为了研究一种高效的多种重金属污染土壤修复剂，本文采用了一种具有OH^-缓释功能的改性Mg（OH）₂，通过重金属污染土壤稳定化修复实验，探讨了改性Mg（OH）₂对污染土壤中多种重金属（Pb、Cd、Cu、Zn）的稳定效率及对多种重金属形态分布的影响。结果表明，投加改性Mg（OH）₂对土壤中多种重金属均有稳定作用，对Pb、Cd、Cu、Zn的稳定效率分别为72.42%、34.53%、87.64%和97.65%，且改性Mg（OH）₂的投加使重金属交换态质量明显减少、残渣态质量增加，进一步提高了重金属的稳定性，降低了重金属生物有效性；另外，改性Mg（OH）₂具有OH^-缓释性，可使土壤长期保持一定的碱性，是一种经济有效的土壤修复剂。

Remediation Effect of Modified Mg(OH)2 on Soil Contaminated by Multiple Heavy Metals

In order to find a highly effective remediation agent for soils contaminated by multiple heavy metals, the modified Mg (OH)₂ with OH^- sustained release function was studied. Through the experiment of stabilization and remediation of heavy metals contaminated soil,the modified Mg(OH)₂ stabilization efficiency for multiple heavy metals (lead, cadmium, copper, zinc) in polluted soil and its influence on the form distribution of the multiple heavy metals were studied. The results show that the addition of modified Mg(OH)₂ has a stabilizing effect on various heavy metals in soil, and the stabilizing efficiencies for lead, cadmium, copper and zinc are 72.42%, 34.53%, 87.64%,and 97.65%, respectively. Moreover, the modified Mg (OH)₂ can significantly reduce the content of exchanged heavy metal states and increase the content of residue states, which can further improve the stability of heavy metals and reduce the bioavailability of heavy metals. In addition, the modified Mg(OH)₂ has the characteristics of sustained-release of OH^-, which can keep the soil alkaline for a long time,thus the modified Mg(OH)₂ is a long-term effective soil remediation agent.