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Two new preconcentrator based measurement systems for ethylene gas concentration in the ppbv range for the fruit logistic industry have been developed and examined. Two different detection principles have been applied: non dispersive infrared (NDIR)-detection and gas chromatography. A silicon based miniaturized gas chromatographic column was combined with a miniaturized silicon preconcentrator and...
We present application of a novel method for fabrication of highly sensitive spherical surface acoustic wave (ball-SAW) odor sensors, using self-assembling of lipopolymers, lipids and GC (gas chromatography) materials. The method allows good control over the thickness of the odor-sensitive layer an important feature for sensitivity enhancement of the ball-SAW sensors. The fabrication method consists...
A research was done to develop procedure of determination of volatile fatty acids (VFAs) in heavily polluted wastewaters using an automated static headspace (HS) unit combined with gas chromatograph (GC) with flame ionization detector (FID). Separation conditions were determined under which VFAs with 2-8 carbon atoms in a molecule separate well on a Stabilwax capillary column. Factors such as sample...
This paper presents a new headspace-liquid-phase microextraction (HS-LPME) strategy for extraction and preconcentration of benzene, toluene, ethyl- benzene, and o-, m- and p-xylenes (BTEXs) from aqueous samples. A typical room temperature ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6), was used as extractant, and the extract was subsequently determined by gas chromatography-hydrogen...
Design, fabrication and testing of a micro thermal conductivity detector (muTCD) with a detection limit of 260 parts per billion (hexane in helium), no excess dead-volume, low power consumption, fast response time (150 musec) and low sensitivity to flow rate is described herein. Significantly, this muTCD is shown to have a linear response and high sensitivity across a 104-fold concentration range;...
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