충주지역 흑색셰일 분포지역에서의 잠재적 독성원소들의 분산과 부화

• 발행기관: 대한자원환경지질학회
• 저자명: 이진수 전효택 김경웅
• 간행물 정보: 『자원환경지질』29권 4호, 495~508쪽, 전체 14쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1996.08.30

영문 초록

This study had three purposes: (1) to investigate dispersion and enrichment level of potentially toxic elements; (2) to identify uranium-bearing minerals in black shales; and (3) to assess the chemical speciation of heavy metals in soils and sediments. Rock, surface soil and stream sediment samples were collected in the Chungjoo area covered with black shales in Korea. These samples were analyzed for multi-elements using INAA and ICP-AES. The maximum abundance of U in black shales is 56 ppm and radioactivity counts up to 240 CPM. Molybdenum, V, Ba, Cu, and Pb are enriched I black shales and most of soils show high concentrations of U, Mo, Ba, Cu, Pb and Zn. Concentrations of potentially toxic elements decrease in the order of mountain soil> farmland soil>paddy soil. Enrichment index of soils and sediments are calculated and higher than 1.0 in the black shale area with the highest value of 6.1. In order to identify U-bearing minerals, electron probe micro analysis was applied, and uraninite and brannerite in black shale were found. Uraninite grains are closely associated with monazite or pyrite with the size of 2㎛ to 10㎛ in diameter whereas brannerite occurs as 50 ㎛ euhedral grains. With the results of sequential extraction scheme, residual fractions of Cu, Pb and Zn in soils are mainly derived from weathering of black shale but Cu, Pb and Zn in sediments are present as non-residual fractions. Lead is predominantly present as oxidizable phase in soils whereas Zn is in exchangeable/water -acid soluble phase in sediments.

키워드

충주 흑색셰일 유독성 원소 방사성 원소 중금속 원소 분산 부하