Abstract
The chemical state of the trace element Pb, which is contained in municipal solid waste incineration residues discharged from a stoker-type incinerator were investigated by using XAFS spectroscopy at beam line BL 01 B 1 in SPring-8. The chemical states of Pb contained in grate ashes were at an oxide state of Pb2+, and it was observed that the amorphous double-oxide compound PbSiO3 was formed. Boiler ashes were mixtures of the compound oxide of the amorphous PbSiO3 and either the chloride of Pb2+ or the carbonate. As for cooling tower ash, no existence of the chloride was observed only the amorphous PbSiO3. In APC residues, if the discharged time in the same facility was different, there were both cases : either the chloride, or the amorphous PbSiO3.
