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| Remediation effects of a new type of silicate passivator on cadmium-contaminated soil |
| Received:March 30, 2017 |
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| KeyWord:soil;heavy metal;cadmium;silicate passivating agent;montmorillonite |
| Author Name | Affiliation | E-mail | | WU Cheng-hui | State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China
University of Chinese Academy of Science, Beijing 100049, China | | | LI Liang | State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China
University of Chinese Academy of Science, Beijing 100049, China | | | YAN Bo | State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China | yanbo2007@gig.ac.cn | | LEI Chang | State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China | | | CHEN Tao | State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China | | | XIAO Xian-ming | State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China | |
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| Abstract: |
| A new type of heavy metal passivator was prepared by activatingsilicon(Si) in montmorillonite, which can passivate the heavy metals in soil and provide nutrients for the growth of crops. The effects of the silicate passivator on the pH of soil, the forms of cadmium(Cd) in soil, and the biomass, plant height, and heavy metal content of pakchoi were investigated in pot experiments. The possible immobilization mechanism of Cd was elucidated. The results showed that the biomass of pakchoi increased and the Cd content of pakchoi decreased obviously after addition of the silicate passivating agent. The biomass and Cd content of pakchoi were increased by 25% and decreased by 59.17%, respectively, after 5‰ passivator was added to a Cd content of 3 mg·kg-1 in the soil. The soil pH increased about 1.4 pH units, and the contents of weak acid-extracted Cd decreased by 19.8% and 9.40%, respectively, after 5‰ passivator was added to Cd contents of 3 and 5 mg·kg-1 in the soil. Thus, the silicate passivating agent could effectively reduce the content of migrating Cd in acidic Cd-contaminated soil and promote the growth of crops. |
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