Development of a gas chromatography system coupled to a metal-oxide semiconductor (MOS) sensor, with compensation of the temperature effects on the column for the measurement of ethene

Abstract. A possible way to reduce the size and complexity of common gas chromatography (GC) systems is economization column temperature regulation system. To this end, a compensation method was developed validated on benchtop GC-PDD (pulsed discharge detector) with ethene. An in-house-developed algorithm correlates retention index test previously selected reference gas. investigate further methods cost reduction, commercial sensors were tested as cheap, sensitive, versatile detectors. Therefore, CO2 chosen naturally occurring gas, while ethene maturity marker for climacteric fruits hence demonstrator, consisting simple syringe injection system, PLOT (porous layer open tubular) boxed in polystyrene-foam housing, MOS (metal-oxide semiconductor) sensor CO2-specific IR (infrared) sensor, used set up GC system apply measurements. Sorption parameters determined via van 't Hoff plot, where entropy S −11.982 J mol−1 K−1 ΔSEthene0 1.351 ΔSCarbondioxide0, enthalpy H −20.622 kJ ΔHEthene0 −14.792 ΔHCarbondioxide0, respectively. Ethene (100 ppm) measurements revealed system-specific correction term 0.652 min. Further interfering gases mean time 3.093 min; predicted 3.099 The demonstrator able identify ethene, function CO2, first approach, without heating mixture by applying holdup term.