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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Long-term and spatial variation of elemental concentrations in local streams impacted by abandoned mine drainage treated with limestone

2014년 8월 28일 16시 02분 34초
ENVR.P-1277 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
황윤호, 이기현1, 권만재2,*
고려대학교 고려대학교, Korea
1연세대학교 지구시스템과학과, Korea
2한국과학기술연구원(KIST) 천연물융합연구센터, Korea
Spatial and temporal distribution of the elements in streams impacted by acid mine drainage (AMD) was investigated to determine controlling factors affecting local aqueous chemistry and changes in the concentration and distribution of metals before and after long-term limestone treatment. Water samples were collected in 2011 in Young Dong (YD) stream, Imgok Creek (IC), and adjacent streams, S. Korea. Young Dong AMD contributed to high concentrations of major and trace elements including Ca, Mg, Fe, Mn, Co, Li, Ni, Pb, Sr, and Zn in the YD stream. The spatial distribution of these elements was mainly controlled by redox processes, dilution on mixing with streams entering YD stream and IC, and co-precipitation/adsorption with Fe (hydr)oxides. Addition of limestone in 1999 lead to an increase in pH, and with the exception of Ca, the concentrations of the elements monitored in YD stream and IC generally decreased compared to data collected before limestone addition. However, the pH did not increase from 2008 to 2011 in the YD stream, suggesting the reactivity of the added limestone was reduced and that an alternative approach is needed to maintain effective long-term treatment. In contrast, K and Na levels temporally increased likely due to increases in agricultural activities along IC. This study suggests that physicochemical processes including dilution by mixing, redox reactions, co-precipitation/adsorption, and increases in pH were major factors controlling the spatial distribution of major and trace elements. However, even though the impacts of AMD can be countervailed by inputs from IC, the impact of other land use issues (e.g., agricultural activity) needs to be considered to assess regional water quality.