摘要(英) |
The 1990 Clean Air Act Amendments (CAAA) of the United States defines Hazardous air pollutants (HAPs), which are those known to cause cancer and other serious health impacts.
Currently the most pouplar analytical method for ambient volatile organic HAPs is U.S. EPA TO-15 worldwide. A similar method called NIEA A715.16B was also developed by Taiwan EPA. Both methods use surface treated stainless canisters to collect air samples, followed by gas chromatography mass spectrometry (GC/MS) analysis. According to Taiwan EPA regulations for special industrial areas, canister samples are collected every six days at specific locations. However, the dataset of such a poor temperal resolution cannot truly reflect the instantaneous changes in HAPs emissions from relevant industries.
In order to capture peak values of the target HAPs in industrial zones at the right moments for source investigation, this research developed an online thermal desorption (TD) coupled GC/MS method to obtain hourly concentrations of selected 86 HAPs at sub-ppb level.
From past experience, it is known that when the TD-GC/MS instrument runs constantly, the ion source could degrade rapidly by as much as 80% in sensitivity in 3 days. In order to cope with the problem, we found that the size of the drawout plate in the ion source affects the stability of MS and thus data quality over time. The drawplate is an ion channel gate which forms a voltage gradience with the repeller, guiding ions to the back end.
The field monitoring was carried out in an industrial area from August to November 2020. By comparing with two different sized drawout plates of 3 and 9 mm, the 6 mm drawout plate can effectively prolong the monitoring time period by extending the life of the ion source to up to 14 days and; hence, significantly reduces the downtime and improves the working efficiency of field monitoring.
The continuous monitoring data was compared in parallel with both canisters and PTR-MS. The online TD-GC-MS system is very accurate and sensitive in determining air pollutants at trace levels, and is able to capture high values with hourly resolution. It has been proven to be a credible on-line method to monitor ambient volatile organic HAPs. |
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