C3.4 - Towards Low-Cost Portable GC Systems for VOC Analysis
- Event
- SMSI 2025
2025-05-06 - 2025-05-08
Nürnberg - Band
- Lectures
- Chapter
- C3 - Gas Sensing I
- Author(s)
- O. T. Penagos Carrascal, M. Köhne, G. Zeh, T. Sauerwald - Fraunhofer IVV, Freising (Germany)
- Pages
- 149 - 150
- DOI
- 10.5162/SMSI2025/C3.4
- ISBN
- 978-3-910600-06-5
- Price
- free
Abstract
A gas chromatography system with a metal oxide semiconductor gas sensor as detector was designed, built, and tested for the detection of hexanal, octanal, and acetic acid. The system consisted of a manual sample injection using a gas-tight syringe (100 μL) and with helium as carrier gas. A free fatty acid phase column (L: 15 m ID: 0.25 mm, coating: 0.25 μm), kept in an oven at 80°C, promoted the selectivity of the sensor via gas separation. The sensor used for detection was a Sensirion SGP40, whose four sen- sing layers were operated isothermally at 300°C. The system was able to measure the presence of individual compounds based on their retention times, specifically hexanal (RT ~70 s), octanal (RT: ~160 s) and acetic acid (RT: ~470 s). Sharp detector peaks were achieved from the first derivative of the sensor signal.