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- Title
乙硫氮对土壤中Cr<sup>3 +</sup> 和Ni<sup>2 +</sup> 的钝化性能.
- Authors
刘文刚; 赵亮; 魏德洲; 张瑞洋
- Abstract
Immobilization property of sodium diethyl dithiocarbamate (DDTCNa) on Cr3+ and Ni2+ in polluted soil was investigated by column leaching process. Experimental results indicated that good immobilization effect of heavy metals in polluted soil was obtained when DDTCNa was used. Especially, DDTCNa showed better immobilization effect on Cr3+. Immobilization rate of heavy metal increased with the increase of DDTCNa dosage. When DDTCNa dosage was llOg-kg-1, more than 99% of Cr3+ and Ni2+ can be immobilized. Additionally, leaching pH had some effect on immobilization of Cr3+ and Ni2+. With the reducing of leaching pH, immobilization effect of Cr3+ and Ni2+ decreased. However, high immobilization rate of Cr3+ and Ni2+ , which were more than 90% , could also be obtained. And immobilization rate of Cr3+ , which was higher than 99. 68% , decreased slightly with the reduction of leaching pH. The formation of metal sulfide chelating precipitates and the immobilization mechanism were systematically studied by XRD measurements and coordination chemistry analysis. The results showed that four-membered chelating precipitates with the coordination number of 4 and 6, respectively, which were Ni(DDTC) 2 and Cr(DDTC) 3, could be obtained when DDTCNa reacted with the heavy metals. Moreover, the stability of Cr(DDTC) 3 was much better than Ni (DDTC) 2, so better immobilization property of Cr3+ was obtained.
- Subjects
SODIUM compounds; DIETHYLDITHIOCARBAMATE; SOIL pollution; SOIL composition; HEAVY metals; CHROMIUM ions
- Publication
Journal of Northeastern University (Natural Science), 2017, Vol 38, Issue 9, p1322
- ISSN
1005-3026
- Publication type
Article
- DOI
10.12068/j.issn.1005-3026.2017.09.022