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Arsenic fractionations in 21 soil samples collected from abandoned mine areas were determined by two sequential extraction methods, Tessier’s methods and Ahn’s methods. Compared to the total As by aqua regia digestion, sum of As fractionated by sequential extractions showed the 70-130% of recoveries in most soils. More than 90% of As were considered as residuals by Tessier’s methods in all samples, while Ahn\'s methods showed that 50-80% of arsenic were fractionated at 1-3 steps of extractions. Phytoaccessible As fractions determined by Mehlich 3 leaching procedure were significantly correlated with the sum of step 1 and 2 by both two sequential extraction methods (p0.01). The correlation coefficients (R=0.920) of Ahn’s methods was much higher than Tessier’s (R=0.667). Though Tessier\'s method has widely used for metal fractionation in soils, it is not proper for As which exist oxyanionic forms such as arsenite and arsenate. Our results implied that Ahn’s methods were more suitable for As fractionation than Tessier’s methods.
국내 폐금속광산 주변 농경지의 비소 오염토양 21개를 채취하여 Tessier 추출법 및 Ahn 추출법 등 2 가지의 단계별추출법을 적용하였다. 단계별추출법에 의해 용출된 비소의 총함량을 왕수분해법을 통해 확인한 비소의 전함량과 비교하였으며, 그 결과 42개 중 34개가 ±30% 범위 내 오차를 보여 단계별추출의 회수율(%)이 대체적으로 100%에 근접함을 확인하였다. 토양 내 비소의 존재형태는 Tessier 추출법을 이용한 경우 잔류물 형태(4단계)가 모든 시료에서 90% 이상의 비율을 차지한 반면 Ahn 추출법에서는 상대적으로 이동성이 높은 1~3단계의 비율이 50~80%의 비율을 차지하여 대체적으로 고른 분포를 보였다. 토양 내 비소의 함량 중 식물전이가능성이 있는 형태를 추출하는 Mehlich 3 용출법과 단계별추출 2단계까지의 누적함량간의 상관분석을 수행한 결과 Tessier 추출법(R=0.667)에 비하여 Ahn 추출법(R=0.920)이 월등히 높은 상관성을 보였다. 본 연구의 결과를 종합하면, 납, 구리, 아연 등의 중금속을 대상으로 고안된 Tessier 추출법은 전 세계적으로 가장 널리 이용되는 단계별추출법이지만, 자연상에서 산화음이온형태의 화학적 거동을 보이는 비소의 존재형태 평가에는 적합하지 않을 수 있음을 확인하였다. 또한 토양 내 비소의 식물흡수도에 대한 관점으로 볼 때, 대체적으로 Tessier 추출법에 비해 Ahn 추출법이 비소의 존재형태 평가에 적합한 양상을 나타냄을 확인하였다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
- Journal Title(Ko) :한국자원공학회지
- Volume : 50
- No :1
- Pages :35-43
- DOI :https://doi.org/10.12972/ksmer.2013.50.1.035


Journal of the Korean Society of Mineral and Energy Resources Engineers







