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

Wave number (cm-'Figure 8. Infrared spectrum of the LC- 1 fraction from the benzene extract of fly ash W1.The infrared spectra of the LC-3 samples exhibited strong aliphaticabsorption peaks and weak aromatic peaks except for the W1 LC-3 fraction(Fig. lo), which appeared to have more aromatic compounds than theremaining three LC-3 fractions. There were also strong absorptions in thecarbonyl (1750-1 700 cm-1) regions of the W1 LC-3 spectrum. Becausethese appeared in fraction LC-3, they were likely due to long-chainaliphatic esters or aryl esters. The aryl esters were first thought to becontaminants of plasticizers introduced during sample handling. Plasticbags were used as storage containers prior to organic analysis (both ethyland diethyl phthalate were identified by GC-YS in the 450°C pyrolysate offly ash Wl). However, aryl esters have been recently indicated in a charFigure 9. HPLC chromatogram of the LC-2 fraction from the benzene extract of fly ash W1. See Figure 2for identification of the numbered peaks.