Water vapor inhibits hydrogen sulfide detection in pulsed fluorescence sulfur monitors
| Autor: | Matthew S. Johnson, Anders Brostrøm Bluhme, Carl Meusinger, Jonas L. Ingemar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Hydrogen lcsh:TA715-787 Chemistry Hydrogen sulfide lcsh:Earthwork. Foundations Analytical chemistry chemistry.chemical_element 010501 environmental sciences Mole fraction 01 natural sciences Sulfur lcsh:Environmental engineering Catalysis chemistry.chemical_compound Relative humidity lcsh:TA170-171 Water vapor Sulfur dioxide 0105 earth and related environmental sciences |
| Zdroj: | Bluhme, A B, Ingemar, J L, Meusinger, C & Johnson, M S 2016, ' Water vapor inhibits hydrogen sulfide detection in pulsed fluorescence sulfur monitors ', Atmospheric Measurement Techniques, vol. 9, pp. 2669-2673 . https://doi.org/10.5194/amt-9-2669-2016 Atmospheric Measurement Techniques, Vol 9, Iss 6, Pp 2669-2673 (2016) |
| ISSN: | 1867-8548 |
| DOI: | 10.5194/amt-9-2669-2016 |
| Popis: | The Thermo Scientific 450 Hydrogen Sulfide–Sulfur Dioxide Analyzer measures both hydrogen sulfide (H2S) and sulfur dioxide (SO2). Sulfur dioxide is measured by pulsed fluorescence, while H2S is converted to SO2 with a molybdenum catalyst prior to detection. The 450 is widely used to measure ambient concentrations, e.g., for emissions monitoring and pollution control. An air stream with a constant H2S concentration was generated and the output of the analyzer recorded as a function of relative humidity (RH). The analyzer underreported H2S as soon as the relative humidity was increased. The fraction of undetected H2S increased from 8.3 at 5.3 % RH (294 K) to over 34 % at RH > 80 %. Hydrogen sulfide mole fractions of 573, 1142, and 5145 ppb were tested. The findings indicate that previous results obtained with instruments using similar catalysts should be re-evaluated to correct for interference from water vapor. It is suspected that water decreases the efficiency of the converter unit and thereby reduces the measured H2S concentration. |
| Databáze: | OpenAIRE |
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