Review Paper:
An Overview of
VOC Sampling and Detection Techniques
Mohitkar Anuradha, Kokate Piyush, Wathore Roshan, Kanade Gajanan and Middey Anirban
Res. J. Chem. Environ; Vol. 27(5); 132-141;
doi: https://doi.org/10.25303/2705rjce1320141; (2023)
Abstract
Volatile Organic Compounds (VOCs) are the key air pollutants that act as precursors
to major secondary pollutants including tropospheric ozone and secondary organic
aerosols (SOA) and various health issues. Therefore, there is a need to have a simple,
portable, reliable sampling method to quantify VOCs. This study reviews VOC sampling
techniques based on feasibility, the material used, sensors and gas chromatographic
instruments. A particular highlight on VOC sensors concerning their sensitivity,
detection limit, response time and robustness has also been done.
Also, the study focuses on critical aspects of VOC characterisation in ambient air
along with the advantages and challenges of the methods. Around 65% of researchers
have used the gas chromatography-based FID technique (GC-FID) for VOC characterisation
in India. The typical sampling methods used in India are sorbent tubes or cartridges,
air sample bags (commonly Tedlar bags), glass air sampling units and canisters.
The portable real-time method is also used. The most common sampling method is passive
sampling with sorbent tubes with activated carbon. However, extensive research is
required on more sophisticated and world-class sensors, sampling and detection techniques
to reach safe and recommended targets.
