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��r(sh��)�g��2014-07-17 16:31 ��(l��i)Դ��h(hu��n)��̌W(xu��)��(b��o) ��: ��x��2257

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��^(gu��)��ؽ��x�ӿ�ͨ�^(gu��)ʳ��机͵ر�ˮϵ�y(t��ng)Σ��Ⱥ��ͨ�^(gu��)��ģ�M��(sh��)�(y��n),��о��SiO₂-Al₂O₃-Fe₂O₃�ȏ�(f��)�ϼ{�ײ��ό�(du��)��Һ��Cu²⁺,��Cd²⁺��Pb²⁺,��Zn²⁺��Ni²⁺��c�̻��,��քe��ؽ��ٺ��4��(j��)��(bi��o)��(zh��n)��GB15618-1995��0%��4%,��6%��10%�ď�(f��)�ϼ{�ײ��,��ͬ��B�VҺ�Լ��ֲ�ﲻͬ��λ��ؽ��ٵĺ��Y(ji��)��,��A��|(zh��)��ؽ��µ��w��,��ں�4%��(f��)�ϼ{�ײ��У��ֹ̻��Һ��63%��Cu,��79%��Cd,��68%��Pb��89%��Zn��76%��Ni,��ں�6%��(f��)�ϼ{�ײ��,��ֹ̻��Һ��82%��Cu,��92%��Cd,��76%��Pb��91%��Zn��88%��Ni,��Џ�(f��)�ϼ{�ײ��ϵĺ��,��ֹ̻�Ч��@��ӡ�

Ӣ��ժҪ:

People may face healthy threats due to the excess of heavy metals ion in soil transferred by food chain and surface water system. Through soil column leaching methods, we studied the sorption and fixation effects of composite nanomaterials (SiO₂-Al₂O₃-Fe₂O₃, etc) upon Cu²⁺, Cd²⁺, Pb²⁺, Zn²⁺, Ni²⁺in soil solution. Different nano-composites (0%, 4%, 6%, 10% of soil mass) were added to the soil with the heavy metals concentrations of 4 times of Grade 2 levels in Soil Quality Standard (GB15618-1995), and then, the heavy metals concentrations in soil solution at different depths and in different organs of the plants cultivated on the soil column were analyzed. Results showed that less amount of heavy metals in alkaline loamy soil moving downward, while the soil column with 4% nano-composites absorbed 63% content of Cu, 79% of Cd, 68% of Pb, 89% of Zn and 76% of Ni in soil solution, and the soil column with 6% nano-composites absorbed 82% content of Cu, 92% of Cd, 76% of Pb, 91% of Zn and 88% of Ni in soil solution. Experimental soil column with more than 6% nano-composites in soil showed no more significant ability of absorbing heavy metals.

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