Evaluating the role of re-adsorption of dissolved Hg2+ during cinnabar dissolution using isotope tracer technique
- Florida Intl Univ., Miami, FL (United States)
- Ocean Univ. of China, Qingdao (China)
- Fujian Agriculture and Forestry Univ., Fuzhou (China)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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 202Hg2+. By adopting the developed method, it was found that the released Hg for trials purged with oxygen could reach several hundred g Lā1, 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. Lastly, 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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC05-00OR22725; FG01-05EW07033
- OSTI ID:
- 1327774
- Alternate ID(s):
- OSTI ID: 1325375
- Journal Information:
- Journal of Hazardous Materials, Vol. 317, Issue C; ISSN 0304-3894
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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