Abstract
Soot particles and NO 2 are among the most hazardous emissions from diesel combustion engines. Currently, no analytical system exists which allows for the simultaneous, time-resolved online analysis of these two components. Furthermore, state-of-the-art NO 2 analyzers for exhaust gas require particle filtration prior to the analysis, which may induce artifacts and measurement errors. We present a photoacoustic instrument which overcomes these drawbacks. The sensitivity of the instrument (LOD NO2 = 0.3 ppm, LOD soot = 0.54 μg m -3, limit of detection/quantification) as well as the temporal resolutions are dictated by the needs of typical automotive applications. Also required for this specific application, we developed PA cells which can be heated to 80 ° C, while the microphones maintain a temperature of 45 ° C. Setup and specific parameters of the instrument are discussed, and the results of typical engine tests are compared to reference analytical instrumentation.
Original language | English |
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Pages (from-to) | 7292-7296 |
Number of pages | 5 |
Journal | Analytical Chemistry |
Volume | 84 |
Issue number | 17 |
DOIs | |
State | Published - 4 Sep 2012 |