| In order to find out the content level and environmental effect of trace elements in the basin and its surrounding coal in Lincang area,23 samples were collected,including 8 coal samples and 3 coal gangue samples of Mengtao,6 coal samples and 6 ash samples of Dazhai.The contents of trace elements in Dazhai and Mengtuo coal were discussed respectively.The trace elements of coal and coal gangue in Mengtao,coal and coal ash in Dazhai are comparable.The trace element contents of coal samples,coal gangue and ash were tested by ICP-MS and ICP-CCT-MS(AS-Se)respectively.The content of trace elements in Mengtao and Dazhai coal is compared with Chinese coal and world coal.The trace elements of Mengtao and Dazhai coal are enriched in different degrees,and the types of elements are slightly enriched different.The trace element content and some element correlation parameters,including rare earth elements in Mengtuo and Dazhai coal,show that the source environment and hydrothermal activity have different effects on trace elements in coal respectively.Hydrothermal activity cause rare earth elements distribution pattern difference.Large enrichment of Ge,Be,As and W in Dazhai coal is caused by the hydrothermal action carrying the trace elements of the substrate dolomite granite.The enrichment of U,Pb,Bi,Th in the basin has nothing to do with the hydrothermal fluid,which may be related to the supply of acid granite.It is concluded that the rare earth elements in coal do not change the distribution pattern,but the content is slightly different.The trace elements of Dazhai ash are the same as those of Dazhai coal and ash.The content of trace elements in Dazhai coal is slightly smaller than that of Dazhai coal.In addition to Ge and Tl,other trace elements are enriched in different degrees in ash.In the Mengtuo area,coal gangue trace elements,we should pay attention to the high content of gangue harmful elements in order to prevent the proliferation of pollution. |
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