矿物对轻度重金属污染水稻田土壤镉的钝化效果

doi:10.19741/j.issn.1673-4831.2021.0148

Abstract

Abstract: In view of the increasingly serious soil cadmium (Cd) pollution, the improper in-situ remediation technology is one of the most widely used methods based on the domestic and foreign heavy metal remediation methods. In this study, different minerals, i. e., sepiolite (BM2), montmorillonite (BM3), attapulgite (BM4), zeolite (BM5), hydroxyapatite (BM6) and quicklime (BM7), and biochar (BM1) were used as restoration materials compared with control (BM0). A two-year remediation experiment was carried out on low Cd contaminated farmland soil in Zhejiang Province. The results show that biochar, sepiolite, attapulgite, hydroxyapatite, and quicklime slightly enhanced rice yield but with no statistically significant difference. All the passivation treatments reduced soil available Cd and rice grain Cd contents. The reduction of grain Cd contents was in an order of biochar > quicklime > zeolite > montmorillonite > hydroxyapatite > attapulgite > sepiolite > control. Besides, the soil available Cd and grain Cd after quicklime addition were 0.214 and 0.169 mg·kg^-1, respectively, which were decreased by 25.17% and 41.26%, respectively compared with BM0. In addition, the proportion of exchangeable Cd to the total Cd reduced by 10 percentage point after quicklime treatment addition, but the contents of Fe-Mn oxide binding and organic Cd increased. The trends of changes of Cd forms in the other mineral treatments were the same, indicating that the minerals remediate Cd-contaminated soil mainly by the conversion of exchangeable Cd into Fe-Mn oxide binding and organic Cd. Carbonate binding and residue Cd almost did not participate in the process of transformation.

Key words: Cd, mineral remediation, paddy soil, Tessier sequential extraction

CLC Number:

Lü Jun-fei, GONG Long-da, CAI Mei, ZHANG Geng-miao, ZHANG Qi-chun. Study on the Passivation Effect of Minerals on Cd in Farmland Soil with Light Heavy Metal Pollution[J]. Journal of Ecology and Rural Environment, 2022, 38(3): 391-398.

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Study on the Passivation Effect of Minerals on Cd in Farmland Soil with Light Heavy Metal Pollution

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