Shahrigh coal was extracted with HN03 for different durations of time end with acid of different concentrations. The extracts were analysed for trace elements by atomic absorption spectrophotometer. Iron was found to be present in highest quantity whereas Mn in lowest quantity in the HN03 extracts. Duration of time and concentration of acid have positive effects on the extraction of trace elements, which were however not very significant in most of the cases. Percentage extractions of trace elements within different duration of time and with acid of different concentration have also been calculated.
M I MOHAMMAD ,M A KHAN ,
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