NO2 measurement artifacts in the presence of soot

Jan Christoph Wolf, Alexander Danner, Reinhard Niessner, Christoph Haisch

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Nitrogen dioxide is a regulated pollutant, which is measured routinely. Since it can be formed during combustion processes, it is often measured in the presence of soot. This study investigates the possible artifact formation due to the interaction of soot and NO2 in the sampling lines and instrument prefilters. The transfer of varying NO2 concentrations through filters and tubes coated with different kinds of soot was investigated by using a dedicated photoacoustic soot and NO2 analyzer (TwinPAS ). The effects of flow rate, temperature, relative humidity, tubing respectively filter material, soot reactivity, and passivation on the NO2 measurement artifacts have been investigated. We found significant lags (up to 2 min) of the NO2 transfer as well as total NO2 losses of up 10 %.

Original languageEnglish
Pages (from-to)447-453
Number of pages7
JournalAnalytical and Bioanalytical Chemistry
Volume406
Issue number2
DOIs
StatePublished - Jan 2014

Keywords

  • Artifacts
  • Diesel Exhaust
  • Photoacoustic
  • Soot

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