Abstract
A new denuder set-up for the measurement of nitrous acid in polluted atmospheres is described here. The set-up is composed of one tetrachloromercurate-coated denuder for the removal of SO 2 and two downstream sodium carbonate-coated denuders for the determination of nitrous acid by the differential technique [Febo et al., 19, 1517–1530 1990]. The removal of SO 2 is necessary in order to avoid the formation of artifact nitrite on the sulfite layer which results from the interaction between atmospheric SO 2 and the Na 2CO 3 coating. Because of this mechanism, the measurement of HONO by means of the previously used NaClNa 2CO 3Na 2CO 3 denuder set-up is heavily biased in all cases when SO 2 and NO 2 are present at high concentration levels (e.g. urban environments).
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