DETERMINATION OF P-XYLENE TRACE IMPURITIES IN THE AIR

The properties of carbonaceous adsorbents (graphitized carbon black an d Karbokhrom B) in concentrating p-xylene from the air are investigate d. The better results are obtained with Karbokhrom B. A simple chromat ographic method is proposed for the determination of p-xylene traces i n the air. The method is based on preconcentration of p-xylene directl y in a short analytical column with Karbokhrom B at ambient temperatur e with subsequent thermal desorption and separation from the concomita nt compounds in the same column with temperature programming.