• Proceedings of the Korean Environmental Health Society Conference
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• 2005.11a
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• pp.138-142
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• 2005

DGM은 상온에서 휘발성을 가지는 수은의 독특한 화학적 성질 때문에 쉽게 대기로 방출될 수 있고, 대기 중으로의 DGM 방출은 수체 내 수은의 유일한 제거 기작일 뿐만 아니라, 고정상으로 존재하던 수은이 다시 이동상의 수은으로 변화하는 중요한 과정이다. 본 연구는 2005년 8월과 10월에 주암호를 대상으로 실시간 자동분석 장치(Tekran 2537A)를 이용하여 DGM 농도변화를 관찰하였다. 전반적인 주암호(n=23)의 여름철 평균 BGM 농도는 110 ${\pm}$ 21 pg $L^{-1}$으로 기존에 발표된 국외 호수에서의 DGM 농도보다 약 3배정도 높았다. 강우에 따른(강우량 : 0.4 mm) DGM 농도 변화는 비가오기 전 89 pg $L^{-1}$ 에서 비온 뒤 89 pg $L^{-1}$ 으로 약 9%가 증가했다. 그러나 가을철 평균 DGM 농도(n=21)는 20 ${\pm}$ 0.4pg $L^{-1}$ 로 여름철보다 약 5.5배 감소했고, 비가 내리는 날씨에서의 DGM 농도는 13.7 pg $L^{-1}$ 로 맑은 날 같은 시간에 비해(32 pg $L^{-1}$) 약 58% 감소했다.

• 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.

• 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: $1.0{\pm}1.2ng/L$).