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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
Wang, J., Y. Xing, Y. Xie, Y. Meng, J. Xia, and X. Feng.
Science of the Total Environment 646:1615-1623(2019)

Scientists evaluated the effects of calcium carbonate-enriched clay minerals (CECM), diammonium phosphate (DAP), or both in different amounts and ratios on Hg removal from solutions. 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+, higher than either DAP (<10%) or CECM (<34%) alone. Precipitation of Hg with phosphorus-associated minerals was suggested as the main Hg removal mechanism. In the field, application of CECM and DAP decreased bioavailable soil Hg contents but did not affect contents of organic matter bound Hg or residual Hg fractions. Application of CECM and DAP yielded dramatic reductions (40-53%) of Hg in the edible tissues of Brassica chinensis and Raphanus raphanistrum in comparison to the control.



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