Determination of C1-C3 carboxylic acids in air with diffusion controlled sampling at elevated flow rates

Summary A sampling system for the determination of C₁-C₃ carboxylic acids in air is described. Acids are collected on coated diffusion screens at elevated flow rates (5.6 L/min), and afterwards quantified by ion-chromatography. Collection efficiency, behaviour of the absorbed comounds and the penetration of particles through coated screens are reported. Results of field measurements and their comparison with those obtained with conventional tubular denuder tubes are shown.Dedicated to Professor Dr. Wilhelm Fresenius on the occasion of his 80th birthday