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《Earth Science Frontiers》 2008-05
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Factors affecting the geochemical behavior of heavy metal elements Pb and Cd in soil.

Yu Tao1,2,Yang Zhongfang1,Zhong Jian1,Cheng Xinbin11.School of Earth Science and Resources,China University of Geosciences(Beijing),Beijing 100083,China2.Institute of Geological Survey,China University of Geosciences(Beijing),Beijing 100083,China  
In this paper,we have studied the relationship of lead and cadmium to the organic matter,clay content and pH in the paddy soil in the Dongting lake region,Hunan Province.It shows that the content of organic matter has a distinct relationship to cadmium or lead in soil.The increase in organic matter in soil may obviously lower the content of cadmium or lead in ionic and exchangeable form.Also,the increase in clay content in soil may slightly increase the proportion of the content of cadmium and lead in ionic exchangeable form to the total content of Pb and Cd.The lead or cadmium that is adsorbed in the clay surface may enter into the frond more easily,and would endanger the ecosystem.The soil acidification may increase the content of cadmium in ionic exchangeable form,which has a distinct relationship to the pH in soil,and directly results in the increase in cadmium content in crop,thus it is a good way to avoid ecosystem damage by preventing soil acidification.The proportion of the content of lead in ionic exchangeable form to the total content of lead is distinctly related to the pH in soil;keeping soil pH in a range of less acidity to alkalescence is a better way to prevent soil acidification or basification in the heavily lead-polluted area.It is concluded that the soil organic matter and soil pH are the most important factors controlling the geochemical behavior of heavy metals.
【Fund】: 中国地质大调查项目“湖南洞庭湖区农业生态地球化学评价”(200314200021);; 中国地质大学(北京)创新团队项目“生态地球化学研究与土地质量评估”
【CateGory Index】: X53
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