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보령 석탄 화력발전소 인근 토양 내 중금속 분포 특성

Investigation on Heavy Metal Distribution in Soils around Boryeong Coal-Fired Power Plant

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주제분류자원공학

초록

충청남도 보령에 소재하는 석탄 화력발전소 인근 농경지 토양을 대상으로 중금속 함량을 측정하였다. 총 44 개의 표토 및 심토 토양을 대상으로 분석한 결과, Cu, Hg, Ni, Pb, Zn는 모두 토양오염 우려기준 미만으로 나타났으나Cd는 16개 시료에서 우려기준을 초과하였다. 지질부하지수(geoaccumulation index)를 구한 결과 다른 중금속들은 오염도가 낮으나 Cd는 매우 높은 오염도를 보였다. 인위적 오염 여부를 판단하기 위해 농축계수(enrichment factor)를 구한 결과 Cd는 인위적 오염원에 의한 토양 내 농축인 것으로 나타났다. 그러나 중금속의 존재형태 규명을 위하여 연속추출을 수행한 결과 Cd를 포함한 토양 내 중금속들은 대부분 용출 가능성이 매우 적은 형태로 존재하여 생물이용도가낮았다. 이러한 결과는 보령 석탄 화력발전소 인근 토양이 인위적인 요인으로 인해 Cd로 오염되었으나 인근 생태계에해로운 영향을 끼칠 가능성은 낮음을 의미한다.

Abstract

The quantity of heavy metals in 44 surface and subsurface agricultural soils was determined for the area around a coal-fired power plant located in Boryeong, Chungnam Province. Although the concentrations of Cu, Hg, Ni, Pb, and Zn were below the warning criteria regulated by the Korean Soil Conservation Act, Cd in 16 samples exceeded the criterion. Geoaccumulation index showed that contamination intensity of Cd was significantly high while those of the other heavy metals were low. Enrichment factor indicated that Cd was loaded to the soil from anthropogenic source(s). However, sequential extraction of the soil samples revealed that most heavy metals including Cd existed as barely extractable phases, which represented low bioavailability of the heavy metals. Our results indicated that Cd contamination which was clearly due to artificial factors in the vicinity of the coal-fired power plant is unlikely to cause the deterioration of nearby ecosystem.

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