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

Abstract

Preparation and analysis of standard VOC (volatile organic compound) gases are needed when developing and evaluating the performance of analytical methods or instruments to detect VOCs. In this study, we designed and developed a simple system for the analysis of VOCs based on their decomposition into CO(2) by a combustion catalyst and their subsequent detection using a solid electrolyte CO(2) sensor. In this sensor, NASICON (Na(3)Si(2)Zr(2)PO(4); Na(+) conductor) and binary carbonate (Li(2)CO(3)-BaCO(3)) were used as the solid electrolyte and the sensing layer, respectively. This developed system proved to be effective in determining the concentrations of standard gases, including VOCs (ethanol, formaldehyde, and toluene), CO, and hydrocarbons in parts per million concentrations (10-500 ppm). The system also could continuously monitor the variations in ethanol vapors prepared by a diffusion method where liquid ethanol was heated at 25 and 50 degrees C. The advantages and limitations of our developed analytical system are also discussed.

Detection of Dissolved CO2 Based on the Aggregation of Gold Nanoparticles

“…The CO 2 pressure of a sample gas or liquid equilibrates through the membrane, and the glass electrode measures the resulting pH of the bicarbonate solution. The solid-state electrolyte detection typically relies on charged ion conductance generated at the expense of high power consumption (300–800 °C), which limits their application in potentially flammable and explosive environments. − Optical detection for dCO 2 is based on the dCO 2 -induced changes in absorbance, ,− fluorescence intensity or fluorescence lifetime, ,− electrochemiluminescence, and surface plasmon resonance (SPR)-based optical sensor . Table summarizes representative optical methods for the CO 2 detection.…”

Miniaturized Dielectric Barrier Discharge Carbon Atomic Emission Spectrometry with Online Microwave-Assisted Oxidation for Determination of Total Organic Carbon

“…In general, analytical procedures for TOC include the oxidation of organic compounds to CO 2 and its subsequent quantification . For the oxidation, either chemical oxidation, , photooxidation, , or high-temperature combustion (HTC) − can be used. HTC operated at temperatures ranging from 680 to 900 °C in the presence of platinum-based catalyst offers higher sample throughput and oxidation efficiency than other methods and is thus widely used in TOC determination.…”

Selective Detection of CO Using Proton-Conducting Graphene Oxide Membranes with Pt-Doped SnO2 Electrocatalysts: Mechanistic Study by Operando DRIFTS

“…Several chemical sensing techniques based on electrochemical, – chemiresistive, – and catalytic combustion – mechanisms have been employed to detect CO at ppm concentrations in air. Among these, solid-state electrochemical gas sensors using ion conductors are promising in terms of their high sensitivity to combustible gases, simple structure, and lower temperature operation. , Potentiometric detection of gaseous species has been extensively studied using proton-, – oxide-, – and sodium-ion – conducting solids. The gas detection relies on the sensor response via the generation of potential differences and mixed potentials upon electrochemical gas reactions.…”