Chemical and toxicological properties of coal fly ash - University of ...

Figure 12. HPLC chromatogram of the LC-3 fraction from the benzene extract of fly ash W1. See Figure 2for identification of the numbered peaks.The infrared spectra of the LC-4 fractions showed the beginning of majordifferences in the compositions of the organics derived from the variousfly ashes. The LC-4 fraction of W1 (like the LC-3 fraction) contained morearomatic compounds and was more complex in composition than were theorganics in the other fly ashes. The peaks due to carbonyl absorption wereresolved into at least two distinct peaks (Fig. 13), indicating thepresence of both aliphatic and aryl esters or long-chain aldehydes andketones. Phenanthrene and pyrene were again identified by HPLC (Fig. 14).Other smaller peaks eluted earlier than pyrene; this was interpreted toindicate that polar compounds were beginning to be eluted. There were nomajor peaks later than that of pyrene.Wave number (cm-I ) lSGS 1983Figure 13. Infrared spectrum of the LC-4 fraction from the benzene extract of fly ash W1.