Abstract
The present work consists of characterizing geochemically the trace elements present in Leao coal, in order to evaluate the emissions from the power station Jacui I (350 MW), Rio Grande do Sul, Brazil. This includes determination of a concentration of these elements and their geochemical association by a theoretical model of the distribution of trace elements in coal. Among the studied elements, As, Cd, Cr, Cu, Mo, Pd and Zn showed high concentrations in the mineral sulphide compounds and secondary associations in the organic and non-sulphide fractions. The elements Co, Ni, Mn and V showed preferential association with the inorganic fraction and lower concentrations in the organic fraction. From the studied associations of trace elements in Leao coal we suggest that those elements associated with the sulphide and organic fractions (Pb, Mo, As, Cd, Cu, Cr and Zn) probably present a higher tendency towards voltilization and enrichment in the fly ashes produced by the combustion of this coal.
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