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BACKGROUND: Oyster shell(OS) is alkaline with pH 9.8, porous, and has high concentration of CaCO 3 . It could be used as an alternative of lime fertilizer to immobilize cadmium(Cd) in heavy metal contaminated arable soil. Therefore, this study has been conducted to compare effects of calcium(Ca) materials [OS and Ca(OH) 2 ] on Cd extractability in contaminated soil and determined mechanisms of Cd immobilization with OS.METHODS AND RESULTS: Both Ca materials were added at the rates of 0, 0.1, 0.2, 0.4, and 0.8% (wt Ca wt-1) in Cd contaminated soil and the mixtures were incubated at 25℃ for 4 weeks. Both Ca materials increased pH and negative charge of soil with increasing Ca addition and decreased 1N NH 4 OAc extractable Cd concentration. 0.1 N HCl extractable Cd concentration markedly decreased with addition of OS. 1 N NH 4 OAc extractable Cd concentration was related with pH and net negative charge of soil, but not with 0.1 N HCl extractable Cd concentration. We assumed that Cd immobilization with Ca(OH)

Determining Effect of Oyster Shell on Cadmium Extractability and Mechanism of Immobilization in Arable Soil