SPME and passive sampling are more suitable for prolonged atmospheric air control, rather than for operative monitoring the concentration of VOC, because of their inherent slow mass transfer. Solvent extraction suggests the use of liquid analysis methods and it is not suitable for determination of readily volatile substances such as methanol. A serious problem of cryogenic VOC preconcentration is the interfering effect of moisture that condenses in the trap. Active sampling on solid sorbents (dynamicsorption) is the most common and effective method of low molecular weight VOCs pre-concentration in the air analysis
[7,8,12,13]. This is done by passing the analyzed air sample through a tube filled with sorbent. The absorbed VOCs are then desorbed by heating into a flow of carrier gas and transported to a gas chromatograph [13,14].