Enrichment of heavy metal elements and their adsorption on iron oxides during carbonate rock weathering process  

作　　者：Shanqin Ni Yiwen Ju Quanlin Hou Shijie Wang Qing Liu Yudong Wu Lingling Xiao 

机构地区：[1]College of Earth Science, Graduate University of Chinese Academy of Sciences, Beijing 100049, China [2]State Key Laboratory of Environment Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

出　　处：《Progress in Natural Science:Materials International》2009年第9期1133-1139,共7页自然科学进展·国际材料（英文版）

基　　金：supported by the National Basic Research Program of China (Grant No. 2006CB202201);the Beijing Municipal Natural Science Foundation(Grant No. 8063032)

摘　　要：Analysis of trace elements in the Lower Palaeozoic carbonate rock strata of the Beijing area shows that the Cr, Zn, Cd and Pb contents increase from primary carbonate rocks to weathered carbonate rocks and from primary carbonate rocks to the soil coexisting with carbonate rock. Distributions of Cr, Zn, Cd and Pb have the same trends as that of Fe2O3. Iron oxides play different roles at different stages of weathering of carbonate rock. The adsorption of Cr, Zn, Cd and Pb on Fe2O3 is greater than on FeO in soil. However, FeO, as a main component of clay mineral, is a better adsorbent of Cr, Zn, Cd and Pb than Fe2O3 in weathered and primary carbonate rocks. According to R-type clustering analysis, the main components of carbonate rock are divided into marine and continental sediments. Correlation analysis shows that heavy metal elements mainly exist in continental substances.Analysis of trace elements in the Lower Palaeozoic carbonate rock strata of the Beijing area shows that the Cr, Zn, Cd and Pb con- tents increase from primary carbonate rocks to weathered carbonate rocks and from primary carbonate rocks to the soil coexisting with carbonate rock. Distributions of Cr, Zn, Cd and Pb have the same trends as that of Fe2O3. Iron oxides play different roles at different stages of weathering of carbonate rock. The adsorption of Cr, Zn, Cd and Pb on Fe2O3 is greater than on FeO in soil. However, FeO, as a main component of clay mineral, is a better adsorbent of Cr, Zn, Cd and Pb than Fe2O3 in weathered and primary carbonate rocks. According to R-type clustering analysis, the main components of carbonate rock are divided into marine and continental sediments. Correlation analysis shows that heavy metal elements mainly exist in continental substances.

关 键 词：Carbonate rock Heavy metal elements ADSORBENT ENRICHMENT 

分 类 号：P618.130.2[天文地球—矿床学] X53[天文地球—地质学]