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- W137652872 abstract "The long-term study of trace elements in coal by the Illinois State Geological Survey has been extended to include many additional samples, wider geographic areas sampled, and determination of additional elements. The successful application of instrumental neutron activation analysis and energy-dispersive x-ray fluorescence techniques has extended the scope of analysis to include 55 elements in whole coal. Present research includes determining the vertical distribution of trace elements in several coal seams in significantly different geologic areas. Many elements, most notably germanium and uranium, in Illinois coals were concentrated at the top or bottom of a coal seam, rather than being generally dispersed within it. Specific gravity separation and acid extraction are currently being used to determine trace-element associations in coal. Both approaches yield information differentiating organically associated trace elements from trace elements associated primarily with individual mineral phases." @default.
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- W137652872 date "1976-01-01" @default.
- W137652872 modified "2023-09-28" @default.
- W137652872 title "Occurrence and distribution of trace elements in coal. [3 refs; 53 elements]" @default.
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