The analytes are adsorbed onto the charcoal pad of a passive sampler and then extracted with carbon disulphide–methanol.
After removal of the carbon disulphide by xanthation, the BTEXs are enriched on a Carboxen SPME fiber, thermally
3 desorbed and analysed by HRGC–FID. Detection limits for a sampling interval of 2 h are between 0.4 and 2 mg/m ,
within-series precision ranges between 6.6 and 12.8%, day-to-day precision is between 11.1 and 15.2%. The results obtained with this procedure are validated by comparison with active sampling.