Towards a GC-based microsystem for benzene and 1,3 butadiene detection: Pre-concentrator characterization

A planar micro-concentrator/injector for low power consumption microchromatographic analysis of benzene and 1,3 butadiene

“…From these graphs, we can observe that the system seems to be more sensitive to benzene than to 1,3 butadiene, which agrees with the results derived from (Lahlou 2011b). This is due, on the one hand, to the higher affinity of the adsorbent for benzene than for 1,3 butadiene and, on the other hand, to the higher sensitivity of the TGS to benzene than to butadiene.…”

“…The effect of gases on the sensor's electrical properties was recorded by monitoring the variations of the sensor's instantaneous conductance versus time, for a temperature of the sensitive element (SnO 2 ) fixed at 673 K. At this temperature, the sensor response was close to a chromatographic peak, as shown elsewhere (Lahlou 2011b). Also, the system response provided by the electrical response of the sensor can allow a quantitative study of the actual concentration of the vapour sample to be analyzed in a real application.…”

“…Activated carbon was selected as adsorbing layer after some previous tests (Lahlou 2011a) that showed its high affinity for benzene and negligible adsorption interference with butadiene (Lahlou 2011b). It is based on lignin activated with KOH and sieved in order to keep the fraction with a grain size below 40 lm.…”

Gas phase micro-preconcentrators for benzene monitoring: A review

“…[14]. based on activated carbon was then applied with a chromatographic system made of a commercial capillary column and a TGS gas sensor for the analysis of benzene in presence of butadiene [17]. The adsorbent was first characterized with a GC/FID system and showed more affinity for benzene than for butadiene, with a low adsorption interference effect between both compounds.…”

Tetra-tert-butyl copper phthalocyanine-based QCM sensor for toluene detection in air at room temperature

“…Although this measurement technique is very sensitive as well as selective toward the target gaseous molecules [5][6][7][8], some restrictions intrinsic to this analytical method make it inadequate for a wide use. Although gas chromatography is a very sensitive technique, measurements are mainly performed in closed laboratory environment due to the complex and bulky instrumentation involved.…”