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J Hazard Mater. 2016 Nov 5;317:466-475. doi: 10.1016/j.jhazmat.2016.05.084. Epub 2016 Jun 2.

Evaluating the role of re-adsorption of dissolved Hg(2+) during cinnabar dissolution using isotope tracer technique.

Author information

1
Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA.
2
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao 266100, China.
3
Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA; Southeast Environmental Research Center, Florida International University, Miami, FL 33199, USA.
4
College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
5
Applied Research Center, Florida International University, Miami, FL 33199, USA.
6
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
7
Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge TN 37831, USA.
8
Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA; Southeast Environmental Research Center, Florida International University, Miami, FL 33199, USA. Electronic address: cai@fiu.edu.

Abstract

Cinnabar dissolution is an important factor controlling mercury (Hg) cycling. Recent studies have suggested the co-occurrence of re-adsorption of the released Hg during the course of cinnabar dissolution. However, there is a lack of feasible techniques that can quantitatively assess the amount of Hg re-adsorbed on cinnabar when investigating cinnabar dissolution. In this study, a new method, based on isotope tracing and dilution techniques, was developed to study the role of Hg re-adsorption in cinnabar dissolution. The developed method includes two key components: (1) accurate measurement of both released and spiked Hg in aqueous phase and (2) estimation of re-adsorbed Hg on cinnabar surface via the reduction in spiked (202)Hg(2+). By adopting the developed method, it was found that the released Hg for trials purged with oxygen could reach several hundred μgL(-1), while no significant cinnabar dissolution was detected under anaerobic condition. Cinnabar dissolution rate when considering Hg re-adsorption was approximately 2 times the value calculated solely with the Hg detected in the aqueous phase. These results suggest that ignoring the Hg re-adsorption process can significantly underestimate the importance of cinnabar dissolution, highlighting the necessity of applying the developed method in future cinnabar dissolution studies.

KEYWORDS:

Cinnabar dissolution; Hg re-adsorption on cinnabar surface; Isotope dilution; Isotope tracer technique; Redox condition

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