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| 钝化剂种类和粒径对复合污染土壤镉铅有效态的影响 |
| The effect of type and particle size of passivator on effective state of Cd and Pb in compound polluted soil |
| 投稿时间：2018-05-31 |
| DOI：10.13254/j.jare.2018.0121 |
| 中文关键词: 重金属，钝化剂，粒度，有效态 |
| 英文关键词: heavy metal, passivator, particle size, effective state |
| 基金项目:云南省科技惠民计划（2014RA018）；国家重点研发计划（2018YFD0800603） |
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| 中文摘要: |
| 为探讨钝化剂种类和粒径对重金属污染土壤的钝化效果，采用室内培养的方法，通过添加三个粒径（60~100、100~200、>200目）下的四种不同钝化剂（自制无机型钝化剂、石灰+生物质炭、硅藻土、磷矿粉），研究钝化剂种类和粒径对重金属复合污染土壤中有效态Cd、Pb的影响。钝化60 d之后的结果表明，自制无机型钝化剂、生物质炭+熟石灰和磷矿粉均在>200目粒径下对土壤有效态Cd的钝化效果最好，较对照分别减少了9.54%、13.93%和11.08%；其中，硅藻土在100~200目的粒径下效果最佳，有效态Cd含量与对照相比降低了22.35%。自制无机型钝化剂、石灰+生物质炭、硅藻土和磷矿粉对土壤有效态Pb的钝化效果都在>200目的粒径下最好，有效态Pb含量与对照相比分别减少了17.81%、18.70%、11.54%和22.19%，其中磷矿粉的钝化效果最佳。研究表明，自制无机型钝化剂、石灰+生物质炭和磷矿粉都是粒径越小钝化土壤重金属Cd、Pb效果越好，可能是由于较小粒径更有利于Cd和Pb由活性态向非活性态转化，硅藻土对Cd、Pb的钝化效果在三个粒径处理间差异不显著。 |
| 英文摘要: |
| In order to study the effect of different types and particle size of passivators on the repair of heavy metal pollution in soils, three particle sizes(60~100, 100~200, >200 mesh) with four different passivating agents(self-made inorganic passivating agent, lime+biochar, diatomaceous earth, phosphate rock powder) were added through laboratory cultivation experiments to study the effect of the type and size of passivation agents on the effective Cd and Pb in heavy metal complex contaminated soil. The results after 60 days passivation showed that self-made inorganic passivation agent, biochar+lime and phosphate rock powder had the best passivation effect on soil available Cd at >200 mesh particle size, which reduced by 9.54%, 13.93% and 11.08%, respectively, compared with the control; Diatomite had the best effect at a particle size of 100~200 mesh, and the effective Cd content reduced by 22.35% compared with the control. The passivation effect of self-made inorganic passivation agent, lime+biochar, diatomaceous earth and phosphate rock powder on soil available Pb is best under the particle size of >200 mesh, which reduced by 17.81%, 18.7%, 11.54% and 22.19%, compared with the control, the phosphate rock powder passivation had the best passivation effect. It indicated that the self-made inorganic passivation agent, lime+biochar and phosphate rock powder had the better effect of Cd and Pb on the passivated soil heavy metals at the smaller particle size. There is not significantly different among the three particle size treatments of diatomaceous earth. |
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