Study on the use of oxidant scrubbers for elimination of interferences dueto nitrogen dioxide in analysis of atmospheric dimethylsulfide

In this work, oxidant scrubbers were evaluated for their ability to prevent sampling losses of dimethylsulfide caused by reactions with nitrogen dioxi de. Various compounds and mixtures were used in the preparation of the oxid ant scrubbers. An automatic flow analysis device was used to compare scrubb ing efficiency for nitrogen dioxide. Among the scrubbers tested, the best w ere shown to be the one made with filter paper or glass wool coated with ir on (II) sulfate, sulfuric acid and pyrogallic acid, and the one made from w ith paper coated with triethanolamine. The results obtained under laborator y conditions, using dimethylsulfide standard gas, and in field experiments confirmed that these scrubbers are suitable for the prevention of oxidation during sampling.