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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 A study on the diffusion coefficients of mercury complexes in agarose gels used for diffusive gradients in thin films

2014년 8월 28일 16시 06분 13초
ENVR.P-1278 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
노샘, 한승희1,*
광주과학기술원(GIST) 환경공학부, Korea
1광주과학기술원(GIST) 환경공학과, Korea
A diffusive gradient in thin films (DGT) technique was applied to measure pore water Hg and monomethylmercury (MMHg) concentrations in lake and coastal sediments. DGT is one of the in situ passive sampling techniques, based on diffusion and adsorption of contaminants onto resin gels, that can be installed in experimental sites. To calculate Hg and MMHg concentrations in sediment pore water from DGT resins, determination of the diffusion coefficients of Hg(II) and MMHg for an agarose gel is required. Here, Hg and MMHg diffusion coefficients were determined under different concentrations of dissolved organic matter (DOM). In case of MMHg, the diffusion coefficient was found to be 3.7 ± 0.6 × 10-6 cm2 s-1 for lake water and 3.4 ± 0.4 × 10-6cm2 s-1 for coastal water. The total percentage of MMHg-DOM species increased as DOM concentration increased, and diffusion coefficients decreased; therefore, the MMHg diffusion coefficient seemed to be affected by the complexation of MMHg by organic ligands. The MMHg concentrations measured by DGT and centrifugation were comparable for pore water MMHg depth profiles, suggesting DGT applicability at the experimental sites.