EFFECTS OF ADDITIVES ON THE BIOLOGICAL TOXICITIES OF COPPER AND CADMIUM IN SOIL EXTRACTS
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Abstract:
The effect of additives including milk vetch,CaCO3 and bentonite on the toxicities of copper and cadmium in soil extracts and their forms were emphatically discussed in the present paper.The ezperimental results demonstrated that of the three additives,CaCO3 howed an extraordinary ability to lower the contents of water-soluble Cu and Cd and extractable Cu and Cd with 0.1 mol/L HCl eatractant as well as their toxicities in red soil,and it could make the 6sad Cd in red soil transform obviously from water-soluble and exchangeable forms into organit,Fe and Mn oxides occluded and sulphide forms.In other words,CaCO3 could chapge the available forms of metals into slowly available and unavailable forms,resulting in the elimination of the toxicities of Cu and Cd in water and acid extraction solutions.
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