• Title, Summary, Keyword: Dissolved gaseous mercury

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Effects of organic carbon and UV wavelength on the formation of dissolved gaseous mercury in water under a controlled environment

  • Lee, Jae-In;Yang, Ji-Hye;Kim, Pyung-Rae;Han, Young-Ji
    • Environmental Engineering Research
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    • v.24 no.1
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    • pp.54-62
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    • 2019
  • 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 $1.4{\times}10^{-6}s^{-1}$ to $3.5{\times}10^{-5}s^{-1}$, 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.

Characteristics of Gaseous Dissolved Mercury and Total Mercury in Yangsuri Marsh of Korea (양수리 용늪의 용존 수은 및 총수은 농도 특성에 대한 연구)

  • Yang, Ji-Hye;Han, Young-Ji;Kim, Pyung-Rae;Park, Sang-Young;Seo, Yong-Seok;Lee, Jong-Hwan;Kim, Moon-Kyung;Yi, Seung-Muk;Cho, Kyung-Deok
    • Journal of Korean Society of Environmental Engineers
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    • v.34 no.12
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    • pp.801-809
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    • 2012
  • Long-term measurement of total mercury (TM) and dissolved gaseous mercury (DGM) were performed in Yangsuri marsh. Average TM and DGM concentrations were $2.0{\pm}2.0$ ng/L and $15.0{\pm}2.8$ pg/L, respectively, indicating that only 2.6% of TM existed as the form of DGM in Yangsuri marsh. While TM did not show the seasonal variation a statistically high DGM concentration was observed in warm season, indicating that DGM was effectively produced by strong solar radiation and high water temperature. There was no relationship between TM and DGM concentrations in Yangsuri marsh, as observed in other studies. DGM in Yangsuri marsh was supersaturated for most of sampling period; therefore, one can conclude that $Hg^0$ in water surface can readily volatilize to the atmosphere.

Variations on the Concentration of Dissolved Gaseous Mercury(DGM) at the Juam Reservoir, Korea (주암호의 용존가스상 수은의 농도변화 특성에 관한 연구)

  • Park, Jong-Sung;Oh, Se-Hee;Shin, Mi-Yeon;Yi, Seung-Muk;Zoh, Kyung-Duk
    • Journal of Korean Society of Environmental Engineers
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    • v.28 no.6
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    • pp.667-676
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    • 2006
  • The reduction of $Hg^{2+}$ in the aqueous phase results in the production of dissolved gaseous mercury(DGM), and the volatilization of DGM has been identified as an important mechanism for the loss of Hg from waterbodies to the atmosphere. Although mercury emission in the world is known to be mostly from Asia, there have been few studies of measuring DGM concentrations in lakes in Asia. In this study, DGM concentrations were measured at Juam reservoir($35^{\cir}00'N,\;127^{\circ}14'E$), Korea. The results showed that the average concentrations of DGM at the upper and down stream of the lake during summer time were $95{\pm}8\;and\;130{\pm}15$ pg/L, respectively and the concentration of total mercury(TM) at the upper and down stream was $2.1{\pm}0.7,\;1.7{\pm}0.3$ ng/L respectively. Average DGM concentration during summer time($101{\pm}14pg/L$) was approximately 5.5 times higher than that during fall($18{\pm}0.1pg/L$). The DGM concentrations ai the midstream decreased from 32 to 13.7 pg/L during rain event, while the TM concentrations increased from 2.2 ng/L to 2.7 ng/L indicating the deposition of mercury from the atmosphere. Also, the diurnal patterns between DGM concentrations and UV intensities were observed. Water temperatures and DOC concentrations were significantly related to DGM concentrations, while TM concentrations were negatively related to DGM concentrations(p<0.0001). Comparing with the study of Dill et al.,(2006) the average concentrations of DGM $(109{\pm}15pg/L)\;and\;TM(2.2{\pm} 0.4ng/L)$ at Juam reservoir were approximately 3 and 2.2 times higher than those measured in other lakes(DGM: $38{\pm}16pg/L$, TM: $1.0{\pm}1.2ng/L$).