Three different approaches to the liquid chromatographic detection of nitro polynuclear aromatic hydrocarbons In air and diesel particulate extracts are presented, based on differential pulse (LCDPD) and amperometrlc (LCEC) electrochemical detection and fluorescence detection following online reduction to the amine (LCFI). The particulate extractlon/fractlonatlon procedure for each detection approach Is discussed. The operational advantages of oxygen removal with a platinum oxygen scrubber (aM three types of detection), the use of modulated pulse detection, and wavelength-programmed fluorescence detection are explored. 1-NKropyrene Is determined In Standard Reference Material (SRM) 1650 diesel particulate matter and In several other "round robin" samples by aH three methods. Results are compared to those obtained by other techniques (gas chromatography/mass spectrometry) and by other laboratories (LCFI). Additionally, 2-nltrofluorene, 9-nHroanthracene, 7-nltrobenz[a ]anthracene, and 6-nHrobenzo[a]pyrene are determined In SRM 1650 by LCFI. The detection limits for 1-nltropyrene (expressed as plcograms) are 5200 (LCDPD), 60 (LCEC), and 10 (LCFI).

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