全面二維氣相層析質譜法分析大氣PM2.5微粒有機物成份(2/2)

Project Details

Description

The composition of PM2.5 aerosols is extremely complex, containing about 20-50% of organic components, including alkanes, alkenes, aromatics, aldehydes,ketones, acids, PAHs, etc. To identify and quantify organic constituents on PM2.5aerosols, a highly efficient separation technique with superb resolution isrequired.Comprehensive GC×GC techniques have evolved rapidly into a powerfulseparation means in the last decade, with superior resolution far beyondconventional chromatography. The basic working principle of GC×GC is to usetwo columns in-series with different chemical forces to interact with analytes,resulting in orthogonal separation and thus high peak capacity. The mostimportant component in GC×GC is the modulator which connects and alsocoordinates primary and secondary columns to perform 2D separation. Its role isto periodically enrich and focus effluents from the primary column to form pulsedsample slices which are then sent to the secondary column for further separation.Due to the rather narrow peak width of each sample slice, ToF-MS with muchfaster data sampling rates than q-MS is utilized to form the system of GC×GCToFMS.In 2018, using solvent extraction to combine with GC×GC-ToFMS, we were ableto identify 7 phthalates and 3 phosphorous fire retardants (PFRs) from urban(Banqiao district) PM2.5 urban samples. As a result, in addition to the well-knownintake channels of oral and skin contact, inhalation of fine particles in polluted airis another channel to pose a health risk. Other than solvent extraction of PM2.5filter samples, a new technique of thermal desorption aerosol gaschromatography (TAG) is also undergone development in my research groupaiming at on-line measurement of PM2.5 in the field to shed light to the formationof secondary organic aerosols (SOA) and source identification. Source markersor profiles of traffic, industrial, biomass burning, and the differentiation ofdomestic and transboundary PM2.5 events can then be realized.Our second goal is to enhance resolution and sensitivity of GC×GC-ToFMS. Bychoosing proper column combination and fine-tuning the modulation variables,the improved resolution and sensitivity can facilitate detection of trace level ofcomplex composition of SOA, such as highly oxygenated organic compoundsdue to prolonged photochemistry. The sensitivity and identification of selectivepolar compounds can be further elevated through the means of derivatizationprior to GC×GC analysis.
StatusFinished
Effective start/end date1/08/2131/07/22

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):

  • SDG 11 - Sustainable Cities and Communities

Keywords

  • Comprehensive Two Dimensional Gas Chromatography - Mass Spectrometry (GC×GC-MS)
  • PM2.5
  • Thermal Desorption Aerosol Gas Chromatography(TAG)
  • Secondary Organic Aerosols(SOA)
  • Phthalates
  • Phosphorous Fire Retardants(PFRs)

Fingerprint

Explore the research topics touched on by this project. These labels are generated based on the underlying awards/grants. Together they form a unique fingerprint.