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Articolul precedent |
Articolul urmator |
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SM ISO690:2012 CARAMAN, Iuliana, RACOVEŢ, Oxana, UNTILA, Dumitru, EVTODIEV, Silvia, STAMATE, Marius D.. Quantitative determinations of carbon oxides in atmosphere by absorbtion spectra. In: Environmental Engineering and Management Journal, 2012, vol. 11, pp. 2159-2162. ISSN 1582-9596. DOI: https://doi.org/10.30638/eemj.2012.268 |
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Environmental Engineering and Management Journal | |||||||
Volumul 11 / 2012 / ISSN 1582-9596 | |||||||
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DOI:https://doi.org/10.30638/eemj.2012.268 | |||||||
Pag. 2159-2162 | |||||||
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The carbon oxides - CO and CO2 normally exist in the atmosphere or they are generated by different chemical reactions like burning or with the participation of organic compounds. The ratio of concentration of these gases determines the stage of food fermentation. To control different processes it is necessary to provide quantitative determinations of concentration of CO and CO2. Today, for determination of concentrations, chemical methods are used, but they require a lot of time and special equipment. These shortcomings are not characteristic for optical methods - the analyses of absorption spectra. As it was proved by experimental measurements, the CO2 and CO molecules don't have absorption bands in the in the visible and near ultraviolet range of spectrum. It was recorded the transmission spectrum of atmosphere (p = 1 atm, T = 298K) in the range of vibration bands of studied atoms. The vibration-rotation bands of H2O, CH, CO2 and CO molecules have been identified. Dependence between optical density and path length crossed by radiation in CO and CO2 columns was analyzed. These results allow direct measurement of the concentration of these gases in the atmosphere. |
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Cuvinte-cheie Absorption band, carbon, concentration, Vibration-rotation |
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