COUPLING OF THERMAL-DESORPTION IN MODIFIED CLOSEABLE SAMPLING COLUMNSWITH WIDE-BORE CAPILLARY GAS-CHROMATOGRAPHY AND MASS-SPECTROMETRIC DETECTION

In contrast to usability of Curie-point pyrolysis at 700 degrees C dir ectly attached to gas chromatography-mass spectrometry (CC-MS) for det ermination of organic wood preservatives in waste wood samples the inv estigation method reported here consists of thermal desorption at temp eratures about 260 degrees C in connection with CC-MS for peak identif ication or GC with flame ionization detection for quantitative analyse s. So-called ''modified closeable sampling columns'' are used as batch -reactor in thermal desorption experiments. Desorbed vapours can be in troduced on capillary columns without sample discrimination and withou t a disturbing lost of resolution. In this manner a lot of individual polycyclic aromatic hydrocarbons were determinated in waste wood sampl es, especially in railway sleepers.