Abstract
Abstract In order to analyse volatile organic compounds (VOCs) in water by the dynamic headspace method, an adapted purge and trap set up was used along with on-column trapping (packing = Tenax GC) and flame ionisation detection. Optimization of the purge step working conditions is discussed with respect to extraction efficiency for 14 representative VOCs used to spike a 25 ml water sample. With that aim in mind, the effect of the following parameters were studied: purge gas volume (Vg/Vl = 20 and 40), sparger vessel temperature (25, 30, 35 and 40°C) and ionic strength (dissolution of 10 and 20% of NaCl in the studied sample). A fair increase of the purge gas volume enhances the recovery of most of the VOCs examined. However, the extraction is still unsatisfactory for the less volatile compounds. Nevertheless, a better purge efficiency for all the VOCs studied is observed when the temperature is increased, at the expenses of an increase of the RSD of the results (= 14%). Moreover, for all the less volatil...
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