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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Salinity intrusion decreases monomethylmercury accumulation in the Mekong Delta food web via resuspension of fine-sediment particles

2014년 8월 28일 15시 57분 57초
ENVR.P-1274 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
최효정, 노샘, 한승희1,*
광주과학기술원(GIST) 환경공학부, Korea
1광주과학기술원(GIST) 환경공학과, Korea
The Mekong River Delta plays an important role in the sustainability of Southeast Asian fisheries and aquacultures. Annually, approximately 2,000,000 tons of fish are harvested from the Mekong River Delta, which provides 75% of the animal protein consumed by the rural Vietnamese population. Despite this importance, geochemical investigation of monomethylmercury (MMHg) bioaccumulation has been largely understudied. In the current study, we identified important biogeochemical factors affecting MMHg accumulation in Mekong Delta invertebrates and fish, focusing on the influence of salinity intrusion on the MMHg accumulation. Dietary carbon source as well as trophic position of the organism was identified as an important feature in determining MMHg bioaccumulation. In particular, freshwater carbon-feeding fauna, indicated by δ13C depletion, showed a greater MMHg accumulation than coastal carbon-feeding fauna, which seems to be caused by enhanced trophic position (δ15N = 5.9±1.0%) and MMHg concentration (5.9±3.0 pM) of freshwater microseston than those of estuarine microseston (δ15N = 4.8±0.3%; MMHg = 1.9±2.4 pM). We suggest that resuspension of surface sediment, depleted in organic carbon and MMHg, in the estuarine mixing zone, decreases bioaccumulation of MMHg in the Mekong River Delta.