Polycyclic aromatic hydrocarbons of coal fly ash: Analysis by gas‐liquid chromatography using nematic liquid crystals

Abstract
The seasonal variations over a period of 12 mo. in the amounts of polycyclic aromatic hydrocarbons (PAH) in fly-ash samples collected from the electrostatic precipitator of a thermal power plant have been studied. PAH generally did not show much seasonal variation. GLC analysis of benzene extract of fly ash showed the presence of 28 polyaromatic hydrocarbons, of which only phenanthrene, anthracene, pyrene, benz[a]anthracene, chrysene, and benzo[a]pyrene could be identified.