Application of a Solid Electrolyte CO2 Sensor for the Analysis of Standard Volatile Organic Compound Gases

摘要

Preparation and analysis of standard VOC (volatile organicncompound) gases are needed when developing and evalu-nating the performance of analytical methods or instru-nments to detect VOCs. In this study, we designed andndeveloped a simple system for the analysis of VOCs basednon their decomposition into CO2 by a combustionncatalyst and their subsequent detection using a solidnelectrolyte CO2 sensor. In this sensor, NASICONn(Na3Si2Zr2PO4;Na conductor) and binary carbonaten(Li2CO3 BaCO3) were used as the solid electrolyte andnthe sensing layer, respectively. This developed systemnproved to be effective in determining the concentra-ntions of standard gases, including VOCs (ethanol,nformaldehyde, and toluene), CO, and hydrocarbons innparts per million concentrations (10 500 ppm). Thensystem also could continuously monitor the variationsnin ethanol vapors prepared by a diffusion methodnwhere liquid ethanol was heated at 25 and 50 °C. Thenadvantages and limitations of our developed analyticalnsystem are also discussed.