The construction and behaviour of the μGC and its chromatographic abilities were described in [3]. The μPC device (see fig 1a) is based on previous works [4].It has an edge size of 18.5 mm x 9.3 mm x 1.26 mm and was fabricated using a silicon/Pyrex stack. In the silicon 8 parallel adsorption channels were integrated. At the back sideof the preconcentrator a 50 :platinum heater was placed for application of the desorption temperature. The preconcentrator was filled with Carbosieve S-II as adsorption material and was integrated into aluminium housing with valves for bypassing and electrical connections for the heater (see fig 1b). Its housing was connected pneumatically to the μGC (see fig 1c)