Multiphase Chemistry of Ozone on Fulvic Acids Solutions
| Autor: | Pierre Conchon, Christian George, Marcello Brigante, Barbara D'Anna |
|---|---|
| Přispěvatelé: | Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Time Factors
Ozone Absorption spectroscopy Kinetics Analytical chemistry Mineralogy 010501 environmental sciences 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Environmental Chemistry Molecule Benzopyrans Organic matter 030304 developmental biology 0105 earth and related environmental sciences chemistry.chemical_classification 0303 health sciences Aqueous solution General Chemistry [CHIM.CATA]Chemical Sciences/Catalysis Hydrogen-Ion Concentration 6. Clean water Aerosol Solutions chemistry 13. Climate action Surface water |
| Zdroj: | Environmental Science and Technology Environmental Science and Technology, American Chemical Society, 2008, 42 (24), pp.9165-9170. ⟨10.1021/es801539y⟩ |
| ISSN: | 0013-936X 1520-5851 |
| DOI: | 10.1021/es801539y⟩ |
| Popis: | Brigante, Marcello D'Anna, Barbara Conchon, Pierre George, Christian; By means of a wetted-wall flow tube, we studied the multiphase chemistry of ozone on aqueous solutions containing fulvic acids (FA), taken as proxies for atmospheric "humic like substances", so-called HULIS. In these experiments, the loss of gaseous 03 was monitored by UV-visible absorption spectroscopy at the reactor outlet (i.e., after contact between the gaseous and liquid phases). Measurements are reported in terms of dimensionless uptake coefficients (gamma) in the range from 1.6 x 10(-7) to 1.3 x 10(-5) depending on ozone gas phase concentration (in the range from 6.6 to 34.4 x 10(11) molecules cm(-3)) and fulvic acid aqueous concentration (in the range from 0.25 to 2.5 mg L-1) and pH (in the range from 2.5 to 9.2). The measured kinetics were observed to follow a Langmuir-Hinshelwood type mechanism, in which O-3 first adsorbs on the liquid surface and then reacts with the Fulvic Acid molecules. The reported uptake coefficients are greatly increased over those measured on pure water, demonstrating that the presence in solution of fulvic acids does greatly enhance the uptake kinetics. Accordingly, the chemical interactions of fulvic acids (or HULIS) may be a driving force for the uptake of ozone on liquid organic aerosols and can also represent an important mechanism for the O-3 deposition to the rivers and lakes. |
| Databáze: | OpenAIRE |
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