Abstract
In this paper, a novel ceramic preconcentrator is manufactured using aluminum nitride (ALN) ceramics. The preconcentrator consists of a heater, a preconcentrator body, a gas inlet and a gas outlet. The adsorption material, Carbosieve SII, is loaded into the preconcentrator. The preconcentrator is integrated with a previously developed micro gas chromatographic system filled with ethylene. When operated, adequate ethylene gas is adsorbed into the preconcentrator. The application of heat pulse also successfully desorbs the ethylene gas. Tests are conducted with ethylene gas at concentrations of 10 ppm, 5 ppm and 2.5 ppm and 400 ppb, respectively. The system is also tested with ethylene gas from ripening bananas over a period of three days. No interference signal is observed in the chromatogram because of other ripening gases (e.g., carbon dioxide, oxygen, alcohol) and humidity. A detection limit of 25 ppb is realized with this system. The developed preconcentrator has several applications, e.g., in food industry and environmental monitoring.
Highlights
It is estimated that one-third of food, which is approximately 1.3 billion tons, is wasted annually in the world
Postharvest losses are caused by several factors, such as temperature, humidity, carbon dioxide, oxygen and excessive production of ethylene gas
A micro gas chromatographic system for the detection of ethylene gas presented by Janssen et al suffered from baseline drift, which results in an inaccurate peak measurement of ethylene gas chromatogram at ppb concentration levels [5]
Summary
It is estimated that one-third of food, which is approximately 1.3 billion tons, is wasted annually in the world. A micro gas chromatographic system for the detection of ethylene gas presented by Janssen et al suffered from baseline drift, which results in an inaccurate peak measurement of ethylene gas chromatogram at ppb concentration levels [5]. In 2014, a large-capacity on-chip preconcentrator to concentrate ethylene gas was presented by Janssen et al.; see [5] for details of the preconcentrator design. The use of the silicon fabricated preconcentrator shows results with drifts for the detection of ethylene gas; see [5] for previous work on the preconcentrator.
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