With the realization of the large-capacity-on-chip preconcentrator device the detection limit of ethylene was increased strongly in comparison to earlier publications. With this new PC-device,
for the first time, a miniaturized GC-system was able to measure about 170 ppbv, which was provided by mixing the smallest concentration available at gas distributors (400 ppbv) with synthetic air. Lower concentrations could not be produced with the equipment available at this time.