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용액의 이온강도와 종류에 따른 토양 중금속 추출성 및 작물 흡수와의 상관성
류지혁 ( Ji Hyock Yoo ),김원일 ( Won Il Kim ),노현명 ( Hyun Myung Noh ),김린환 ( Lin Hwan Kim ),( Anitha Kunhikrishnan ),김지영 ( Ji Young Kim ),김두호 ( Doo Ho Kim ) 한국환경농학회 2013 한국환경농학회 학술대회집 Vol.2013 No.-
This study was conducted to investigated the extractability of trace metals (Cd, Pb, Cu, Zn and Ba) in polluted soils depending on ionic strength of dilute salt solutions, the kinds of dilute acid solutions and relationship between metal content in soils and the content in crop. We used 5 different upland soils polluted mainly with Pb and the ranges of Cd, Pb, Cu, Zn and Ba content were 0.1-0.5, 41.5-271, 10.8-82.5, 26-110 and 15.7-89.3 mg/kg, respectively. To determine directly available metal content to plant, 0.01 M and 0.002 M Ca(NO3)2 solutions were used. The Cd, Pb, Zn and Ba content extractred with 0.01 M Ca(NO3)2 solution were 1-5.5 times higher than that of 0.002 M Ca(NO3)2 extraction, however, Cu content from 0.01 M Ca(NO3)2 extraction was only 70-80% of 0.002 M Ca(NO3)2 extraction, showing no effect of different ionic strength on Cu extractability. To extract active metal pool in soils, two kinds of dilute acid solutions were used. The solutions were 0.43N HNO3 used in European country including the Netherlands and 0.1 N HCl mainly used in Asian county including Korea and Japan. For Pb and Cu, the extracted content using 0.43N HNO3 were 1.7-3.4 times higher than that of 0.1 N HCl, however, the content of Cd, Zn and Ba from the two solutions showed little differences for each element. The study soils were filled in the pots and radish was grown to see correlations between extractable metal content in soils and the content in radish at harvest. The relationships between Ca(NO3)2 extractable Cd, Zn and Ba in soils and the content in radish were significant (Pearson r=0.84-0.91) irrespective of ionic strength but the relation for Cu was not significant (r=0.27). For Pb, r=0.55 in case of 0.002 M Ca(NO3)2 extraction but there was no relation for 0.01 M Ca(NO3)2 extraction. The correlation between two dilute acid extractable Ba and Ba in radish was significant (r=0.7), however, for other elements the relations were low (r≤0.45). The relationships between soil and radish were well linked with plant uptake factors (PUF) of Cd, Pb and Zn, however, a significant relation of Ba was not matched with low PUF (0.0024) suggesting that another factor might interact with Ba uptake by plant within soil-soil solution-plant system.