Volume 28, Number 10, December 2000Structure elucidation by LC-MS
|Page(s)||953 - 959|
Determination of volatile organic compounds in coal, fly ash and slag samples by direct thermal desorption/GC/msG. Fernández-Martínez, P. López-Mahía, S. Muniategui-Lorenzo and D. Prada-Rodríguez
Department of Analytical Chemistry, University of A Coruña, Zapateira s/n, E-15071 A Coruña, Spain
(Received July 20, 2000; revised December 12, 2000; accepted December 18, 2000.)
This work proposes a method for quantifying volatile organic compounds (VOCs) in coal, fly ash and slag, coming from coal-fired power stations, using direct thermal desorption coupled with gas chromatography (GC) and mass spectrometry (MS) detection. The described method requires practically no sample handling and is precise and sensitive. Aromatic and aliphatic hydrocarbons (benzene, toluene, alkylbenzes, heptane and octane) are the most abundant compounds in these solid samples, coal samples presenting higher levels than fly ash and slag. Other compounds (acids, ketones, aldehydes, limonene, etc.) were identified by mass spectrometry.
Key words: Thermal desorption -- volatile organic compounds -- coal -- fly ash -- slag -- GC-MS.
© EDP Sciences, Wiley-VCH 2000