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Their bioavailabilities in many cases are related to pH and Eh, which suggest a generally contrasting or antagonistic effect. In this paper, the pH and Eh of soil samples had been modified with the addition of organic fertilizer, and Tessier sequential extraction processes were utilized to draw out heavy metal speciation. With increasing pH and reducing Eh, the content associated with the exchangeable, carbonate-bound, Fe-Mn oxide-bound, and organic-bound types of the Cd decreased. The info