THIS DOCUMENT DESCRIBES WORK PERFORMED N THE ENVIRONMENTAL RESEARCH DIVISION AT ARGONNE NATIONAL LABORATORY IN SUPPORT OF THE ARMS CONTROL TECHNOLOGY PROGRAM AT THE DEFENSE NUCLEAR AGENCY. THROUGH THIS WORK, IT WAS DEMONSTRATED THE FEASIBILITY OF USING A PROTOTYPE INSTRUMENT TO MONITOR AMBIENT AIR FOR LEWISITE. THIS INSTRUMENT, THE FLOW INJECTION TRACE GAS ANALYZER (FITGA), IS BASED ON THE SELECTIVE PRECONCENTRATION OF TRACE LEVELS OF LEWISITE AS ARSENITE ION USING ...