Development of a new LOPAP instrument for the detection of O3 in the atmosphere
| Autor: | S. Peters, J. Kleffmann, S. Liedtke, Guillermo Villena, Ralf Kurtenbach, Iustinian Bejan, Peter Wiesen |
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| Rok vydání: | 2013 |
| Předmět: |
Detection limit
Atmospheric Science Ozone 010504 meteorology & atmospheric sciences Stripping (chemistry) Analytical chemistry Indigo dye Photometer 010501 environmental sciences 01 natural sciences law.invention Atmosphere chemistry.chemical_compound chemistry law Fourier transform infrared spectroscopy Absorption (electromagnetic radiation) 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Atmospheric Environment. 67:112-119 |
| ISSN: | 1352-2310 |
| Popis: | A simple O 3 -LOPAP (Long Path Absorption Photometer) instrument for the selective detection of O 3 in the atmosphere is presented, which is mainly intended to be used as an extension of a recently developed NO 2 -LOPAP. O 3 is sampled in a stripping coil by a selective chemical reaction with the highly absorbing Indigo dye. The reduction of the optical absorption of the dye is detected in a liquid core waveguide. The instrument has a detection limit of 0.4 ppbv, an accuracy of 10%, a precision of 2% for 6 min time resolution and allows the absolute quantification of O 3 according to Lambert–Beer's law. Interferences towards nitrogen oxides (NO and NO 2 ), N 2 O 5 , H 2 O 2 and several VOCs were quantified in the laboratory and found to be negligible for atmospheric conditions. The new instrument was successfully validated against a commercial UV-absorption instrument during an urban field campaign and against the FTIR technique in a smog chamber under complex photosmog conditions. For the UV-absorption instrument significant positive interferences towards aromatic species were observed in the smog chamber. |
| Databáze: | OpenAIRE |
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