熱脫附技術用於一、二維氣相層析質譜法分析空氣中氣態與微粒中有機污染物(1/2)

Project Details

Description

This two-year project is aimed at developing thermal desorption (TD) technique tobe coupled with gas chromatography mass spectrometry (GC/MS) to pursuit thefollowing two issues: 1. analysis of ambient hazardous air pollutants (HAPs), 2.organic species on aerosols. Both one- and two-dimensional GC will be used toanalyze ppbv-pptv level air pollutants. With regard to HAPs we have successfullyestablished an on-line TD-GC/MS method to monitor more than 100 volatileorganic compounds (VOCs) per hour which can be operated in the field as anunattended continuous monitoring facility.In the next phase of the two-year project from 2021-2024, we intend to furthercouple the TD technique with 2-D GC technique to form an automated TDGC×GCmethod analyzing trace-level of VOCs on aerosols. The high enrichmentfactor (~10000) of TD coupled with the high separation power of GC×GC isexpected to form a powerful tool for the purpose. With the support of MOST in thepast we had developed solvent extract method to analyze semi-volatile VOCs(SVOCs) on aerosols with GC×GC-ToFMS and observed hundreds of species inurban aerosol samples, with phthalates and phosphorus flame retardants beingthe two most prominent groups of compounds. This finding suggested weatheringof plastic products into microplastics in the environment has become a new pathof air pollution. Nevertheless, solvent extraction only removes mostly SVOCs,leaving the VOC sector unanalyzed. As a result, this project intends to combineTD with GC×GC to analyze VOCs on aerosols in an on-line manner as our lastpiece of the jigsaw puzzle to fully cover gas phase (first part) and aerosol (second表CM02 計畫主持人:王家麟 申請條碼編號:111WFA0710505 共 2 頁 第 1 頁part) analysis.While coupling TD with GC/MS is quite successful in general, it was found thatthe electron-impact ion source of MS deteriorates rather rapidly and falls belowthe acceptable sensitivity level after two weeks of continuous operation due toexcessive oxidation by water vapor in air samples. Therefore, we intend to findsolutions to retard the oxidation speed to further extend the operation time andminimize the downtime due to the need of ion source maintenance in fieldoperation.
StatusFinished
Effective start/end date1/08/2231/07/23

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

  • Thermal desorption gas chromatography mass spectrometry (TD-GC/MS)
  • hazardous air pollutants (HAPs)
  • organic species on aerosols
  • comprehensive two-dimensional gas chromatography (GC×GC)

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