Saturday, 15 July 2006

Feasibility of Zerovalent Iron to Stabilize Cd in the Paddy Soils Adjacent to the Closed Metal Mines in Korea.

Jae E. Yang1, Kyung-Yoal Yoo1, Yong-Sik Ok1, Jai Joung Kim2, and Yi Nam3. (1) Kangwon National Univ, Division of Biological Environment, Chuncheon, South Korea, (2) Chungbuk National Univ, Department of Agricultural Chemistry, Cheongju, South Korea, (3) National Agricultural Cooperative Federation (Nonghyup), Seoul, South Korea

Objective of this research was to find an optimum amendment to stabilize Cd in the rice paddy soil adjacent to the closed metal mines. Greenhouse experiment was conducted to evaluate Cd immobilization in the paddy soils by zerovalent iron, lime, humus and composts. Sequential extraction of Cd in the rice paddy soils revealed that the treatment of such amendments reduced the adsorbed Cd fractions from 29% to 54% and the exchangeable Cd fractions from 39% to 99% as compared to those in the control. Efficiency of the amendments to inhibit Cd uptake by the rice grains (Oriza sativa L.) was in the orders of zerovalent iron > lime > compost > humus. Zerovalent iron treatment effectively inhibited the Cd uptake up to 70% by rice as compared to that in the control without showing any reduction in the rice yield. The overall result supported that zerovalent iron could be applicable to immobilize the Cd in the metal contaminated rice paddy soils which are sensitive to redox condition.

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