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http://dx.doi.org/10.7857/JSGE.2015.20.4.090

Partitioning of Heavy Metals between Rice Plant and Limestone-stabilized Paddy Soil Contaminated with Heavy Metals  

Koh, Il-Ha (Department of Environmental Engineering, Kwangwoon University)
Kim, Eui-Young (National Environment Lab. (NeLab))
Kwon, Yo Seb (Department of Energy and Mineral Resources Engineering, Sejong University)
Ji, Won Hyun (Korea Mine Reclamation Corporation (MIRECO))
Joo, Wanho (Department of Environmental Engineering, Kwangwoon University)
Kim, Jinhong (Department of Environmental Engineering, Kwangwoon University)
Shin, Bok Su (Department of Environmental Engineering, Kwangwoon University)
Chang, Yoon-Young (Department of Environmental Engineering, Kwangwoon University)
Publication Information
Journal of Soil and Groundwater Environment / v.20, no.4, 2015 , pp. 90-103 More about this Journal
Abstract
The agricultural soil, meets soil environmental standards whereas agricultural product from the same soil does not meet permissible level of contaminants, is identified in the vicinity of the abandoned mine in Korea. This study estimated the stabilization efficiency of Cd and Pb using limestone through the flood pot test for this kind of agricultural paddy soil. We had the concentration of the monitored contaminants in soil solution for 4 months and analyzed fractionations in soil and concentrations in rice plant. In soil solution of plow layer, the reductive Mn had been detected constantly unlike Fe. The concentrations of Mn in limestone amended soil was relatively lower than that in control soil. This reveals that the reductive heavy metals which become soluble under flooded condition can be stabilized by alkali amendment. This also means that Cd and Pb associated with Mn oxides can be precipitated through soil stabilization. Pb concentrations in soil solution of amended conditions were lower than that of control whereas Cd was not detected among all conditions including control. In contaminants fractionation of soil analysis, the decreasing exchangeable fraction and the increasing carbonates fraction were identified in amended soil when compared to control soil at the end of test. These results represent the reduction of contaminants mobility induced by alkali amendment. The Cd and Pb contents of rice grain from amended soil also lower than that of control. These result seems to be influenced by reduction of contaminants mobility represented in the results of soil solution and soil fractionation. Therefore contaminants mobility (phytoavailability) rather than total concentration in soil can be important factor for contaminants transition from soil to agricultural products. Because reduction of heavy metal transition to plant depends on reduction of bioavailability such as soluble fraction in soil.
Keywords
Cd; Pb; Stabilization; Paddy; Rice;
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Times Cited By KSCI : 10  (Citation Analysis)
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