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The use of calcium carbonate-enriched clay minerals and diammonium phosphate as novel immobilization agents for mercury remediation: Spectral investigations and field applications
Jianxu Wang;  Ying Xing;  Yuanyan Xie;  Yong Meng;  Jicheng Xia;  Xinbin Feng
2019
Source PublicationScience of the Total Environment
Volume646Pages:1615–1623
Abstract

We used calcium carbonate-enriched clay minerals (CECM) and diammonium phosphate (DAP) as immobilization agents for mercury (Hg) immobilization. The effects of CECM, DAP, or both in different amounts and ratios, as well as pH and initial Hg concentrations, on Hg removal from solutions were investigated. The removal mechanism was revealed using transmission electron microscope with energy-dispersive X-ray (TEM-EDX) spectroscopy, and extended X-ray absorption fine structure spectroscopy (EXAFS). The performance of CECM and DAP under field conditions was also studied. The results showed that application of CECM and DAP at a ratio of 50:1 (w/w) removed over 90% of Hg from solutions containing 1.8 μM Hg2+, which was 9- or 2.6-fold higher than solely DAP (b10%) or CECM (34%b), respectively. Mercury removal by CECM and DAP was weakly affected by pH values between 4 and 10, and their maximum Hg removal capacity was 37 mg g−1 . Both TEM-EDX and EXAFS results showed that the precipitate of Hg with phosphorus-associated minerals might be the primary mechanism of Hg removal by CECM and DAP. Results from the field trial showed that application of CECM and DAP decreased soil bioavailable Hg contents, but did not affect contents of organic matter bound Hg or residual Hg fractions, as compared with control and initial soils. Application of CECM and DAP resulted in dramatic reductions (40%–53%) of Hg in the edible tissues of Brassica chinensis and Raphanus raphanistrum in comparison to the non-treated control. We conclude that CECM and DAP offer a promising method for in situ remediation of Hg-contaminated farmlands in southwest of China.

KeywordIn-situ Immobilization clay Minerals spectral Investigations mercury Risk Management
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8879
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China
3.BCEG Environmental Remediation Co., Ltd, Beijing 100015, China
4.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, Guizhou, China
5.University of Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation
GB/T 7714
Jianxu Wang;Ying Xing;Yuanyan Xie;Yong Meng;Jicheng Xia;Xinbin Feng. The use of calcium carbonate-enriched clay minerals and diammonium phosphate as novel immobilization agents for mercury remediation: Spectral investigations and field applications[J]. Science of the Total Environment,2019,646:1615–1623.
APA Jianxu Wang;Ying Xing;Yuanyan Xie;Yong Meng;Jicheng Xia;Xinbin Feng.(2019).The use of calcium carbonate-enriched clay minerals and diammonium phosphate as novel immobilization agents for mercury remediation: Spectral investigations and field applications.Science of the Total Environment,646,1615–1623.
MLA Jianxu Wang;Ying Xing;Yuanyan Xie;Yong Meng;Jicheng Xia;Xinbin Feng."The use of calcium carbonate-enriched clay minerals and diammonium phosphate as novel immobilization agents for mercury remediation: Spectral investigations and field applications".Science of the Total Environment 646(2019):1615–1623.
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