영대 금은광산 주변 농경지에서 비소 및 중금속의 계절적 변화와 토양과 식물의 상관성 평가
Seasonal Variation and Correlation between Soil and Crop Plant of Arsenic and Heavy Metal Concentrations in Paddy Fields around the Yeongdae Au-Ag Mine, Korea
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이 연구는 영대 금은광산 주변의 논토양과 식물(벼)의 비소와 중금속 오염과 계절적 변화를 고찰하고자 하였다. 계절적인 변화를 고찰하기 위하여 2010년 6월, 8월 및 10월에 조사 대상 농경지의 토양과 식물을 채취하였다. 또한 토양과 식물의 유기적 관계를 규명하기 위하여 토양 시료를 왕수, 1M MgCl2, 0.01M CaCl2 및 0.05M EDTA 등 다양한 추출제로 전처리하여 비소 및 중금속을 분석하였다. 비소와 중금속의 상대적인 추출비(RER)는EDTA < MgCl2 < CaCl2 순서로 증가되었으며, 동일한 추출법에서는 원소의 지구화학적 이동도에 따라 Cd과 Zn의 상대적인 추출비가 As, Cu 및 Pb 보다 상대적으로 높았다. 또한 토양과 식물의 비소 및 중금속에 대한 계절적 변화에 있어서는 산화환경(10월)이 환원환경(8월)에 비해 상대적으로 높은 함량이 검출되었다. 또한, 벼줄기의 생물학적 농축계수(BAC)가 벼(쌀)보다 높았으며, 원소별로는 Cd, Cu 및 Zn이 As와 Pb에 비해 상대적으로 높은 결과를 얻었다.
Abstract
This study has focused on evaluation on environmental contamination and seasonal variation of As and heavy metals in soils and crop plant (rice) in paddy fields around the Yeongdae Au-Ag mine. Paddy soils and crop plants were sampled at June, August and October, 2010 to examine seasonal variation of As and heavy metals. Soil samples were extracted by various methods including aqua regia, 1M MgCl2, 0.01M CaCl2 and 0.05M EDTA to evaluate the soil-plant relationships. Relative extraction ratio (RER) for As and heavy metals in the samples increased in the order of EDTA < MgCl2 < CaCl2. In the same extraction methods, the RER values for Cd and Zn were relatively higher than those for As, Cu and Pb due to differences in geochemical mobilities. For seasonal variation, relatively high concentrations of the elements were found in the soils and rice stalk grown under oxidizing conditions (October) than reducing (August) conditions. In addition, biological accumulation coefficients (BACs) of the rice stalks were higher than those of the rice grain, and the coefficients for Cd, Cu and Zn were higher than those for As and Pb.
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