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Supercritical fluid extraction of nitrated polycyclic aromatic hydrocarbons and polycyclic aromatic hydrocarbons from diesel exhaust particulate matter


Supercritical fluid extraction of nitrated polycyclic aromatic hydrocarbons and polycyclic aromatic hydrocarbons from diesel exhaust particulate matter



Journal of Chromatography 609(1-2): 333-340



ISSN/ISBN: 0021-9673

DOI: 10.1016/0021-9673(92)80177-v

Polycyclic aromatic hydrocarbons (PAHs) and nitrated PAHs (nitro-PAHs) were extracted from diesel exhaust particulates and diesel soot using supercritical CHCIF2 (freon-22), CO2, and CO2 with added modifiers. Pure CO2 was able to extract 1-nitropyrene spiked on air sampling filters, but did not yield quantitative extractions from diesel exhaust particulates [standard reference material (SRM) 1650 of the National Institute of Standards and Technology (Gaithersburg, MD USA)]. N-nitropyrene could be quantitatively extracted in 45 min using either pure CHCIF2 or 10% toluene in CO2 as a modifier, whereas 10% mixtures of CHCIF2 or methanol in CO2 yielded only moderate recoveries. Supercritical CHCIF2 also yielded quantitative extraction of PAHs from SRM 1650. Various nitro-PAHs could be determined in soot collected from the exhaust pipe of a bus after extraction with CO2 modified with CHCIF2 or toluene.

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Accession: 007845786

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