Zerovalent iron retards Cd uptake by rice through immobilization
Cadmium in rice grown in the paddy soils contaminated with heavy metals from closed metal mines in Korea generally exceeds the safety guideline of KFDA (Korea Food and Drug Administration), 0.2mg (Cd)·kg<-1> in rice grains. The objective of this research was to apply chemical agents such as zerovalent iron (ZVI), lime, humus, and compost to immobilize Cd in contaminated rice paddy soils. Sequential extraction of the rice paddy soil revealed that treatment with such chemical agents reduced the adsorbed Cd fractions from 29％ to 54％ and the exchangeable Cd fractions from 39％ to 99％, as compared to those in the untreated soil (control). Efficiency of the chemical agents to inhibit Cd accumulation in rice grains was in the order of lime> compost>ZVI>humus in the greenhouse experiment and compost> ZVI>humus>lime in the field experiment. Moreover, ZVI treatment did not influence the rice yield and inhibited Cd accumulation in rice grains by about 70％ as compared to that in the control. Overall results indicated that ZVI was a more effective amendment to stabilize phytoavailable Cd fractions in contaminated rice paddy soils.
cadmium bioavailabitity immobilization lime rice (Oriza sativa L.) zerovalent iron
Jae E. Yang Yong Sik Ok Su-Jung Kim Kyung Yoal Yoo Won-Il Kim
Division of Biological Environment, Kangwon National University, Chuncheon, 200-701, South Korea Department of Renewable Resources, University of Alberta, Edmonton, Alberta T6G 2E3, Canada National Institute of Agricultural Science and Technology, RDA, Suwon, 441-857, South Korea
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
720-721
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）