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Mercury is among the most hazardous trace elements released during fuel combustion, yet its occurrence in biomass and biomass ash remains insufficiently constrained. This paper presents an integrated assessment of published data on Hg contents, associations, and probable modes of occurrence in eight biomass types and their ashes generated during combustion, with emphasis on Hg volatilization, retention in biomass ash, and comparison with industrial coals used in Bulgaria. Published chemical, mineralogical, thermal...