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03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Measurements of resupply kinetics of mercury from soil to soil solution using the diffusive gradients in thin films induced fluxes in soils (DIFS) model [우수포스터상]
2016년 2월 22일 21시 14분 30초
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4월 22일 (금요일) 13:00~14:30
광주과학기술원(GIST) 환경공학과, Korea
In the current study, the temporal and spatial changes in concentrations of mercury (Hg) and monomethylmercury (MMHg) in soil solution during the in situ diffusive gradients in thin films(DGT) deployments were simulated using the DGT induced fluxes in soils (DIFS) model. First, DGTs for Hg and MMHg measurements were prepared using 3-mercaptopropyl functionalized silica gel as a resin layer and agarose gel as a diffusive layer. The kinetic experiments were implemented using artificial soils with varying Hg and MeHg concentrations: 1, 10, and 50 mg/kg dry soil. The model determined K
was 69, 1010, and 4640 cm
/g for Hg, and 43, 96, and 4229 cm
/g for MMHg, when Hg and MMHg concentrations were 1, 10, and 50 ppm, respectively. The model determined T
was 701, 9.5, and 4.0 sec for Hg, and 94, 76, and 1.8 sec for MMHg, when Hg and MMHg concentrations were 1, 10, and 50 ppm, respectively. The R value was significantly decreased (< 0.5) when deployment time was longer than 10 hour for 1 ppm Hg, while it was not considerably changed for 10 and 50 ppm Hg during 120 hour of deployment time. For MMHg, the R was largely decreased (< 0.5) when deployment time was longer than 5 hour for 1 and 10 ppm, whereas it was larger than 0.5 for 50 ppm. These results suggest that DGT-induced Hg and MMHg supply from solid to soil solution can be sustained when Hg and MMHg concentrations are larger than 50 ppm. Overall, the DIFS model was successfully used to provide quantitative interpretation of DGT measurements in terms of fundamental kinetic and equilibrium resupply parameters.
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