Answers are grounded in this paper and cite their sources.
A diffusion denuder with a thin anion exchanger membrane tube as the collecting element and with a scrubber solution flowing in a narrow annular gap outside the membrane is described. The use of this device with a dilute sulfate-sulfamic acid solution as scrubber has been exploited for collecting nitric acid. The method is essentially free from interference due to NO2, and response characteristics are described for a continuous flow application. Direct UV detection, used to demonstrate response characteristics in the continuous monitoring mode, is not sufficiently sensitive for the measurement of low levels of ambient gaseous HNO3.
No takes yet. Share an insight, caveat, or question.
Philips et al. (1987) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: