抄録
Ash content in coal and/or waste products sometimes includes considerable heavy metals such as Pb, Cd, As, Se and Hg. In their combustion processes, these heavy metals are vaporized to flue gas due to their high volatilities, and a part of them concentrates in sub-micron particulates, those are difficult to be removed by conventional dust collecting equipments. Therefore, for the control of the emission of toxic heavy metals from various combustion plants to the air, it is important to grasp not only the total emissions of heavy metals, but also heavy metal enrichments especially in small particulates in flue gas. In this study, a simple and rapid analytical method to estimate heavy metal enrichments in particulates depending on their sizes was proposed, in which LIBS is applied to the direct analysis of dust classified by particle sizes using Electrical Low Pressure Impactor.
