Published:Journal of Chromatographic Science, ISSN 0021-9665Volume 41, Number 5, May/June 2003, pp 245-250

Rapid Analysis of PAHs in Fly Ash Using Thermal Desorption and Fast GC–TOF-MS

Daozhong Zou, Kunlei Liu, Wei-Ping Pan, and John T. Riley
Materials Characterization Center, Department of Chemistry, Western Kentucky University, Bowling Green, KY 42101
Yiqan Xu
Key Laboratory of Clean Coal Power Generation and Combustion Technology, Ministry of Education of China, Southeast University, Nanjing 210096, China

Polycyclic aromatic hydrocarbons (PAHs) are semivolatile organic compounds that may form as a result of incomplete combustion of organic materials. After they are produced in combustion systems, this class of chemicals can be emitted with flue gas or adsorbed in combustion residues such as fly ash and bed ash. The purpose of this study is to develop a thermal extraction (TE) method for the determination of the 16 U.S. Environmental Protection Agency specified priority PAH pollutants in fly ash. The commonly used method for determining PAHs in solid wastes is solvent extraction followed by gas chromatography (GC) or GC–mass spectrometry (MS) analysis. This method is work- and time-intensive and produces solvent waste. In this study, the samples are analyzed using TE and fast GC–time-of-flight (TOF)-MS. The complete process from extraction to analysis can be achieved in less than one hour. The results indicate that the TE–GC–TOF-MS method has good linear range from 1.5 to 60 µg/g for all 16 PAHs. The recoveries for the 16 target PAHs vary between 83% and 94%.

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