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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 A non-linear response of monomethylmercury concentrations in fish to the water column eutrophication in artificial reservoirs

2016년 2월 17일 15시 24분 20초
ENVR.P-501 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 22일 (금요일) 13:00~14:30
저자 및
노샘, 한승희1,*
광주과학기술원(GIST) 환경공학부, Korea
1광주과학기술원(GIST) 환경공학과, Korea
The aim of this study was to identify how chemical characteristics (e.g., conductivity, pH, chlorophyll-a, dissolved organic carbon, and sulfate) of reservoir water interact to affect the spatial variance in fish monomethylmercury (MMHg) concentrations. We hypothesized that MMHg concentrations of reservoir fish would be higher in eutrophic than in oligotrophic reservoirs because increased dissolved organic matter and sulfate in eutrophic water would promote in situ production of MMHg in water and sediment. We investigated concentrations of Hg and MMHg in surface waters, sediments, as well as common fish species (barbel steed, bass, mandarin fish, and bluegill) collected from 14 artificial reservoirs in Korea from 2013 to 2015. The chlorophyll-a (chl-a), pH, conductivity, and other chemical variable data were collected from the national network of Water Resources Management Information System. Multiple tools, including Pearson correlation, self-organizing map, and principal component analysis, were applied in the statistical modeling of Hg species. The MMHg concentration in sediment, ranging from 0.082 to 0.98 ng g-1, showed close correlation with fish MMHg concentration (r=0.81 for barbell steed and r=0.75 for bluegill, Pearson correlation), ranging from 0.38 to 325 ng g-1. It suggests that MMHg produced in situ in sediment is a major source of MMHg in reservoir fish. The sediment MMHg was negatively affected by chl-a in water (r= -0.54, Pearson correlation), which could be explained by decreased Hg(II) bioavailability in high organic sediments. The MMHg concentration in fish (r2=0.77) as a function of chl-a showed a lognormal distribution: MMHg in fish reached a peak level at 3.9 μg L-1 of chl-a, and when chl-a > 3.9 μg L-1, somatic growth dilution decreased fish MMHg with increasing chl-a. The reservoirs showing the maximum fish MMHg were classified as mesotrophic reservoirs, where primary production was limited by total phosphorous and light availability.