生态环境学报2009，Vol.18Issue(5)：1761-1763,3.
煤矸石风化物不同粒级中重金属镉含量及其形态变化
Content and speciation changes of Cd in different particle size of coal waste
摘要
Abstract
The weathered coal wastes were sampled at the surface layer in Fushun West Opencast coal mine dump, the weatherings were divided into 3 particle size fraction of>2 ram, 2～0.25 mm and <0.25 mm. The contents of Cd and its chemical speciation were determined in mother rocks and their different particle fractions of coal waste weathering product. The results show that the contents of Cd exceed the soil environment quality standard of 2th level, the pH of shale, mudstone and their weathering products is from 7.2 to 8.6, but the pH of burned mudstone is 4.9. In the carbonaceous shale weathering product of 2～0.25 mm, Cd lose is the most, which is 73.6%; in <0.25 mm grade, Cd loses are less, which is 17.0%, that may be related to the fine-grains' surface adsorption; the Cd is not easy to lose in mudstone weathering product, and the Cd contents also changes less relatively; but in burned mudstone weather-ing product, Cd is easy to loss. In all types of coal waste weathering product samples, the Cd mainly exists in residual speciation; the Cd in reduced speciation and extractable speciation from weak acid is less; and oxidation speciation is the least. The Cd in extract-able speciation from weak acid has the high proportion in <0.25 mm weathering particles.关键词
煤矸石/粒级/镉(Cd)/化学形态Key words
coal waste/ particle size fraction/ Cd/ chemical speciation分类
资源环境引用本文复制引用
魏忠义,韩周,王秋兵..煤矸石风化物不同粒级中重金属镉含量及其形态变化[J].生态环境学报,2009,18(5):1761-1763,3.基金项目
辽工宁省教育厅创新团队项目(2006T120) （2006T120）
辽宁省自然科学基金项目(2040520) （2040520）
