폐금속광산 주변 오염농경지의 As 및 중금속 안정성 효율 평가
Study of the Stabilization of As and Heavy Metals Contaminated Farmland Soils nearby Abandoned Metal Mines, Korea
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초록
이 연구는 금속광산 주변 농경지 토양으로부터 비소 및 중금속 안정성 효율 평가를 위해 실험을 실시하였다. 컬럼실험 결과, 5% 입상석회석을 첨가한 경우 비소는 35%, 카드뮴 80%, 구리 75%, 납 100% 및 아연 85%로 감소하였으며, 입상석회석 3%와 제강슬래그 2% 첨가시 비소를 제외한 모든 원소에서 좋은 처리효과를 나타내었다. 컬럼 전, 후 시료를 이용한 단계별(연속)추출 결과 비소와 구리는 90% 이상 안정된 형태(4～5단계)의 토양으로 존재하며, 카드뮴은 75%가 쉽게 용출되는 형태(1～3단계)의 토양으로 존재하는 것으로 나타났다. 또한 납과 아연에서도 80% 이상 안정된 형태로 존재하는 반면, 복토재의 컬럼실험 전, 후 단계별 추출 결과는 컬럼실험 후에 생물학적 이용도가 높은 단계인 1～3단계가 모두 상승하여 식물에 중금속이 흡수될 가능성이 있는 것으로 판단된다.
Abstract
This study has focused on evaluation of stabilization ability of Arsenic and heavy metals in agricultural soils contaminated by mining activities. According to column test (adding 5% of granule limestone), concentrations of As, Cd, Cu, Pb and Zn in the soils were decreased to 35%, 80%, 75%, 100 and 85% respectively. By adding 3% of granule limestone and 2% of steel making slag, more elements in soils were stabilized, except As. In comparison with sequential extraction results for before and after stabilization treatment, over 90% of As and Cu (step 4 and 5), also more than 80% of Pb and Zn in the soils existed in the strong bound, and over 75% of Cd in the soils existed in relatively weak bound (step 1, 2 and 3). consequently crop plants which grown in contaminated soils can be affected by accumulation of As and heavy metals derived from covering materials.
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