A laser-photolysis fragment-fluorescence (LPFF) method for the detection of gaseous nitric acid in ambient air |
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| Authors: | Th Papenbrock F Stuhl |
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| Institution: | (1) Physikalische Chemie I, Ruhr-Universität, D-4360 Bochum, Federal Republic of Germany |
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| Abstract: | The development and first tests of a novel method for the direct, sensitive, selective, and fast detection of gaseous nitric acid in air are described. The detection method is based on the laser-photolysis fragment-fluorescence (LPFF) method using 193 nm (ArF) laser light. The photolysis process yielding OH fluorescence has been thoroughly investigated. Up to now, the method has been found to be practically free of interferences. The mixing ratio for nitric acid is measured on-line with a detection limit of about 0.1 ppbv for an accumulation time of the signal of 10–15 min. A number of tests and field measurements were performed to demonstrate the feasibility and limits of the described detection method. |
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| Keywords: | Nitric acid laser detection method field measurement |
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