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제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Application of the diffusive gradients in thin films induced fluxes in soils (DIFS) model to predict soil reservoir size and soil-solution transfer rate of uranium

등록일
2016년 2월 24일 12시 43분 47초
접수번호
1850
발표코드
ENVR.P-507 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 22일 (금요일) 13:00~14:30
발표형식
포스터
발표분야
환경에너지
저자 및
공동저자
NGUYENHUUVIET, 한승희1,*
광주과학기술원(GIST) 환경공학부, Korea
1광주과학기술원(GIST) 환경공학과, Korea
Uranium is considered as one of the most abundant radioactive contaminants in natural soils and its concentration varies from 0.1 to 10 mg/kg in soils, in general. The diffusive gradients in thin films (DGT) is a useful technique for in situ measurements of trace metals and organic contaminants, which can provide diverse information on soil behaviors of contaminants. We deployed DGTs in artificially prepared soils (70% sand, 20% kaolin, and 10% peat moss) of varying uranium concentrations (1, 10, and 50 mg/kg dry soil), and measured DGT-accumulated uranium concentration for 125 hours. Using a numerical model of DGT induced fluxes in soils (DIFS), quantitative interpretation of DGT measurements were provided, including depletion of soil solution as a function of time and distance from the diffusive layer surface, distribution coefficient (KD) for labile uranium, and the response time (TC) of uranium from soil to soil solution. Calculation of dissolved uranium concentration as a function of distance showed that depletion was initiated from 1.4 cm from the diffusive layer surface for 1 ppm uranium, while it was initiated from 0.4 cm for 50 ppm uranium for 125 hours of deployment. The KD and TC were also systematically varied on uranium concentration: KD was estimated to be 9.6, 125, and 4580 cm3/g and TC was estimated to be 47, 27, and 1 sec, when uranium concentration was 1, 10, and 50 ppm, respectively. Overall, the DIFS model is suggested to be used together with DGT for prediction of labile metal availability in soil solution as a function of time and distance.

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