Gas phase micro-preconcentrators for benzene monitoring: A review

Benzene is an illustrative example of cancerigenic compounds at low ppb level, which can be found as contaminant in petrochemical industry applications. The pre-concentration of this compound is an important step prior to gas detection allowing to reduce significantly the detection limit of current detection systems. Nowadays, huge advancements have been made for developing gas miniaturized pre-concentrators to be used as an injection unit in front of gas microdetection systems for benzene monitoring. Herein, a comparative review about gas microconcentrators for benzene is reported, starting from available microstructures design to the main adsorbents and their application in detection systems.