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Amperometric detector for gas chromatography based on a silica sol-gel solid electrolyte
- Source :
- Talanta. 174
- Publication Year :
- 2017
-
Abstract
- An electrochemical cell comprising a silica sol-gel solid electrolyte, a working electrode that protrudes into a gas phase, and reference and counter electrodes that contact the solid electrolyte comprises an amperometric detector for gas chromatography. Under potentiostatic conditions, a current related to the concentration of an analyte in the gas phase is produced by its oxidation at the three-phase boundary among the sol-gel, working electrode, and the gas phase. The sol-gel is processed to contain an electrolyte that also serves as a humidistat to maintain a constant water activity even in the presence the gas chromatographic mobile phase. Response was demonstrated toward a diverse set of analytes, namely hydrogen, 1,2-ethandithiol, phenol, p-cresol, and thioanisole. Using flow injection amperometry of hydrogen with He as the carrier gas, 90% of the steady-state current was achieved in < 1s at a flow rate of 20mLmin-1. A separation of 1,2-ethandithiol, phenol, p-cresol, and thioanisole at a 2.2mLmin-1 flow rate was achieved with respective detection limits (k = 3 criterion) of 4, 1, 3, and 70 ppmv when the working electrode potential was 800mV.
- Subjects :
- Working electrode
Chemistry
020209 energy
Inorganic chemistry
Thioanisole
Analytical chemistry
02 engineering and technology
Electrolyte
021001 nanoscience & nanotechnology
Amperometry
Analytical Chemistry
Electrochemical cell
Phase (matter)
Electrode
0202 electrical engineering, electronic engineering, information engineering
Gas chromatography
0210 nano-technology
Subjects
Details
- ISSN :
- 18733573
- Volume :
- 174
- Database :
- OpenAIRE
- Journal :
- Talanta
- Accession number :
- edsair.doi.dedup.....c16914b65ed810c888f2636af578eb95