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DOI: https://doi.org/10.4491/eer.2018.045
Effects of organic carbon and UV wavelength on the formation of dissolved gaseous mercury in water under a controlled environment
Jae-In Lee1, Ji-Hye Yang2, Pyung-Rae Kim1, and Young-Ji Han1
1Department of Environmental Science, Kangwon National University, Chuncheon 24341, Republic of Korea
2Policy Planning Team, AKA Inc., 212 Gasan digital 1-ro, Geumcheon-gu, Seoul 08052, Republic of Korea
Corresponding Author: Young-Ji Han ,Tel: +82-33-250-8579 , Fax: +82-33-259-5563, Email: youngji@kangwon.ac.kr
Received: January 23, 2018;  Accepted: May 22, 2018.
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ABSTRACT
The effects of UV wavelength and dissolved organic carbon (DOC) on the formation of dissolved gaseous mercury (DGM) were investigated in a controlled environment. To remove any other influences than UV wavelength and DOC, purified water was used as the working solution. DGM was instantly produced with irradiation of all UV lights even without DOC; whereas, there was no noticeable increase of DGM during irradiation of visible light. The amount of formed DGM increased as the DOC concentration increased even in dark conditions; however, UV-B irradiation significantly promoted DGM production with DOC present. The rate constants of reduction ranged from 1.4 × 10-6 s-1 to 3.5 × 10-5 s-1, with the lower values occurring under the dark condition without DOC and the higher values resulting under UV-B irradiation and high DOC concentration. However, DGM production was not linearly correlated with the DOC concentration at higher range of DOC in this study. Future studies should investigate the effects of DOC concentration on mercury (Hg) reduction over the broad range of DOC concentrations with different DOC structures and with other influencing parameters.
Keywords: Dissolved gaseous mercury | Dissolved organic carbon | Mercury reduction | UV wavelength
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