GC Determination of Traces of Louis′ Agent in Air with Derivitization and Thermodesorption

Air sample was collected in stainless steel sampling tube through suction by SKC sampling pump at the rate of 330 mL·min-1 for a definite time.Louis′ agent (L.A.in short) or in its chemical name 2-vinylchloride-dichloro-arsine,was adsorbed and enriched on the adsorbant.The process of derivatization (with 3,4-dimercaptotoluene) and thermodesorption was carried out in the sampling tube under the prescribed conditions.The parameters of the thermodesorption were optimized by applying the methods of Plackett-Burman designing,center composite designing and response camber.Simulated air samples containing separately 116.2 mg·L-1 and 1.162 g·L-1 of the L.A.were analyzed by the proposed method,the results obtained achieved values of recovery of 77.1% and 99.4% respectively.