Development of a Portable Device to Collect Sulfuric Acid Aerosol.

摘要

Progress is reported on research to develop a quantitative,interference-free method for collecting airborne sulfuric acid aerosol on a filter. Since previous research found that severe losses of sulfuric acid were caused by ammonia,ambient particulate material,and other interferents, a method was needed that converts sulfuric acid to a stable derivative for subsequent analysis. Methods evaluated for direct fixation of sulfuric acid aerosol were not found to be selective. Therefore, a sampling method was investigated that uses a combination of selective volatilization of the sulfuric acid, prefiltration of particulate interferents,and derivation of the vaporized acid on an alkali-impregnated filter. The initial stages of this current research on the volatilization-derivatization technique are described.