Emerging Pollutants in Environment (POPs, VOCs, PAHs PFAS, Microplastics)
How to sample air for the analysis of persistent organic pollutants (POPs) using thermal desorption technology.
The Markes International's application note ( may be downloaded from their website) focuses on the analysis of VOCs in ambient air, sampled using sorbent tubes and a cryogen-free thermal desorption system. The note covers various aspects, including
sampling methods, instrumentation, and data analysis.
Sampling Methods and Instrumentation includes:
1. Sorbent Tubes:
Air samples are collected using sorbent tubes, which capture a wide range of VOCs
2. Thermal Desorption (TD):
The captured VOCs are desorbed from the sorbent tubes using a thermal desorption system.
3. Gas Chromatography (GC) and Mass Spectrometry (MS):
The desorbed VOCs are then analyzed by GC-MS, which separates and identifies the different compounds.
Application Note Highlights:
1. Quantitative Re-collection:
The note demonstrates the quantitative re-collection of split flows, allowing for repeat analysis and recovery checks.
2. Polycyclic Aromatic Hydrocarbons (PAHs) in Air:
The application note also investigates the performance of TD systems for the analysis of PAHs in air.
3. Microplastics in environment:
A separate application note addresses the challenges of microplastic characterization using TD-GC-MS, providing information-rich VOC profiles for identifying and quantifying plastics.
4. PFAS in environment:
Another application note focuses on the analysis of per- and polyfluoroalkyl substances (PFAS) in air using TD-GC-MS/MS.
Key Takeaways:
TD systems offer a versatile approach for the analysis of VOCs in air.
Sorbent tube sampling and thermal desorption preconcentration provide a robust method for capturing and analyzing a wide range of volatile and semi-volatile compounds.
The use of GC-MS allows for the accurate identification and quantification of various POPs and other pollutants in air samples.
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