2种钝化剂对Cd和Pb复合污染土壤的修复效果机理研究

Study of Remediation of Two Different Passivation Agents on Cd and Pb Compound-contaminated Soil

针对农田土壤受重金属污染,农作物重金属累积风险逐渐严重的问题,以重金属轻污染农田为研究对象,种植4轮次油麦菜,以土壤中和蔬菜中Cd、Pb含量做指标开展研究,对比2种不同钝化剂对重金属轻污染农田的修复效果。试验前后土壤中pH值、有机质、总Cd、Pb含量和有效态Cd、Pb含量的比对结果分析表明,2种钝化剂都能降解Cd、Pb的含量,钝化剂的作用下有机质的增长也能促进对污染土壤的修复,2种钝化剂都能处理有效态重金属,相较下土壤改良剂的处理效果更佳。通过试验前后蔬菜中Cd、Pb含量分析发现,2种钝化剂对于修复土壤中和蔬菜中的Cd和Pb都具有较好的长效性。

In view of the problem that farmland soil is polluted by heavy metals and the accumulation risk of heavy metals in crops is becoming more and more serious,taking farmland lightly polluted by heavy metals as the research object,four rounds of leaf lettuce were planted,the contents of Cd and Pb in soil and vegetables were used as indexes to carry out the research and compare the remediation effects of two different kinds of passivators on lightly polluted farmland by heavy metals.The comparison analyses of pH,organic matter,total Cd and Pb and effective Cd and Pb in soil before and after experiment showed that,both two passivators can degrade the contents of two heavy metals in Cd,Pb effectively,the increase of organic matter under the action of passivators can also promote the remediation of contaminated soil,both two kinds of passivators can deal with effective heavy metals,and the effect of soil modifiers is better than that of iron-based biocarbon conditioner.The analysis show that the two passivators have good long-term effects on the remediation of Cd and Pb in soil and vegetables.