Analysis of particulate polycyclic aromatic hydrocarbons by on-line coupled supercritical fluid extraction-liquid chromatography-gas chromatography-mass spectrometry

作者：Shimmo M; Adler H; Hyotylainen T; Hartonen K; Kulmala M; Riekkola ML^*

来源：Atmospheric Environment, 2002, 36(18): 2985-2995.

DOI：10.1016/S1352-2310(02)00243-1

• supercritical fluid extraction
• liquid chromatography-gas chromatography polycyclic aromatic hydrocarbons
• filter sampling
• atmospheric particulates

An on-line supercritical fluid extraction-liquid chromatography-gas chromatography-mass spectrometry (SFE-LC-GC-MS) method was developed for the analysis of the particulate polycyclic aromatic hydrocarbons (PAHs). The limits of detection of the system for the quantification standards were in the range of 0.25-0.57 ng, while the limits of determinations for filter samples varied from 0.02 to 0.04 ng m(-3) (24 h sampling). The linearity was excellent from 5 to 300 ng (R-2 > 0.967). The analysis could be carried out in a closed system without tedious manual sample pretreatment and with no risk of errors by contamination or loss of the analytes. The results of the SFE-LC-GC-MS method were comparable with those for Soxhlet and shake-flask extractions with GC-MS. The new method was applied to the analysis of PAHs collected by high-volume filter in the Helsinki area to study the seasonal trend of the concentrations. The individual PAH concentrations varied from 0.015 to more than 1 ng m(-3), while total PAH concentrations varied from 0.81 to 5.68 ng m(-3). The concentrations were generally higher in winter than in summer. The mass percentage of the total PAHs in total suspended particulates ranged from 2.85 x 10(-3)% in July to 15.0 x 10(-3)% in December. Increased emissions in winter, meteorological conditions, and more serious artefacts during the sampling in summer season may explain the concentration profiles.

• 出版日期2002-6