High PM2.5 concentration episodes are frequently reported in the Taiwan news in recent years. The composition of PM2.5 aerosols is complex, containing about 20-50% of organic components. These components include alkanes, alkenes, aromatics, ketones, etc. To identify and quantify these multiple organic compounds in the PM2.5 aerosol samples, a separation technique with high resolution ability is needed.Comprehensive GC^GC techniques have evolved rapidly into a powerful separation means in the last decade, with superior resolution far beyond conventional chromatography. The basic working principle of GCxGC is to use two columns in-series with stationary phases exerting different types of interactions with analytes, resulting in orthogonal separation. The most important component in GC^GC is the modulator which connects and also coordinates primary and secondary columns to perform 2D separation. Its role is to periodically enrich and focus effluents from the primary column to form sample slices which are then sent to the secondary column for further separation. We are the first group to use PLOT column as the 2D to prove solid-gas absorption for highly volatile compounds; all other works use polarity as their 2D. We will be also among the first to use TD-Deans switch GCxGC to analyze VOCs on aerosols.The first objective of this research is to connect the thermal desorption (TD) method to Deans switch-GC^GC to form the TD-Deans switch-GC^GC method for the analysis of aerosol organic components. The Deans switch method is a valve-based modulation for GC^GC instead of using the presently more common thermal/cryo-type commercial GC^GCs.Our second goal is to fine-tune the comprehensive GC^GC method aiming for the aerosol organics. Sensitivity will be further improved by increasing the sample recovery. The TD-Deans switch-GC^GC method will be further applied into the field study of in-situ aerosol measurement. With this development, the emission sources such as emissions of traffics, industrial, biomass burning, etc., can be identified with high time resolutions.
|Effective start/end date||1/08/16 → 31/07/17|
UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):
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