Title: NO measurement artifacts in the presence of soot.
Authors: Wolf, Jan-Christoph; Danner, Alexander; Niessner, Reinhard; Haisch, Christoph
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 NO in the sampling lines and instrument prefilters. The transfer of varying NO concentrations through filters and tubes coated with different kinds of soot was investigated by using a dedicated photoacoustic soot and NO analyzer ( TwinPAS). The effects of flow rate, temperature, relative humidity, tubing respectively filter material, soot reactivity, and passivation on the NO measurement artifacts have been investigated. We found significant lags (up to 2 min) of the NO transfer as well as total NO losses of up 10 %.
Subjects: NITROGEN dioxide & the environment; SOOT; DIESEL motor exhaust gas; PHOTOACOUSTIC effect; HUMIDITY
Publication: Analytical & Bioanalytical Chemistry, 2014, Vol 406, Issue 2, p447
ISSN: 1618-2642
Publication type: Academic Journal
DOI: 10.1007/s00216-013-7495-8

NO measurement artifacts in the presence of soot.

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