Analytical Sciences

Rapid Extraction of Water Soluble Organic Compounds from Airborne Particulate Matter

Sathrugnan KARTHIKEYAN* and Rajasekhar BALASUBRAMANIAN*^,**

*Department of Chemical & Biomolecular Engineering, Block E5, 4 Engineering Drive 4, National University of Singapore, 117576 Singapore
**Division of Environmental Science & Engineering, National University of Singapore, 117576 Singapore

Water soluble organic compounds (WSOC) in airborne particulate matter (PM) have received considerable attention in recent years due to their abundance and their importance in atmospheric processes. The analysis of WSOC is necessary for quantifying the relative contribution of individual organic compounds to the total WSOC mass. In the present work, we evaluated the performance of a microwave-assisted extraction (MAE) method for the determination of WSOC in PM and compared the data with those of a conventional ultrasonic extraction (USE). The experimental results showed that the MAE method requires a shorter extraction time (5 min) compared to USE. The isolated water-soluble organic fraction of PM was subsequently analyzed using ion chromatography (IC) for low molecular weight organic acids. The rapid MAE method was used in conjunction with IC for the analysis of organic acids in PM samples, collected from different sources.

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