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Simple measurement of deposition velocities and wall reaction probabilities in denuder tubes—II. High deposition velocities
Abstract The methodology reported in Part 1 of this series is now extended and further developed to include measurements of relatively high deposition velocities and reaction probabilities of gaseous analytes on a solid denuder wall coating. The method is based again on the reversed-flow gas chromatography technique, but employs a denuder tube coated only in part of its total length with the solid. The mathematical formulation of the problem is similar to that of Part I, and is solved as before. It describes the diffusion band of each analyte in the form of a sum for difference) of two exponential functions of time. The pre-exponential factors and the exponential coefficients of these functions are computed by a simple PC program of non-linear least-squares analysis. By means of another two PC programs, the values of the diffusion coefficient of the analyte in the carrier gas, its deposition velocity on the tube coated wall and the wall reaction probability are computed. The method has been applied to acetylene and sulphur dioxide in nitrogen, depositing on marble powder. Consistent results are obtained with the denuder tube coated alternatively on its upper or lower part, and the diffusion coefficients are in good agreement with those calculated theoretically.
Simple measurement of deposition velocities and wall reaction probabilities in denuder tubes—II. High deposition velocities
Abstract The methodology reported in Part 1 of this series is now extended and further developed to include measurements of relatively high deposition velocities and reaction probabilities of gaseous analytes on a solid denuder wall coating. The method is based again on the reversed-flow gas chromatography technique, but employs a denuder tube coated only in part of its total length with the solid. The mathematical formulation of the problem is similar to that of Part I, and is solved as before. It describes the diffusion band of each analyte in the form of a sum for difference) of two exponential functions of time. The pre-exponential factors and the exponential coefficients of these functions are computed by a simple PC program of non-linear least-squares analysis. By means of another two PC programs, the values of the diffusion coefficient of the analyte in the carrier gas, its deposition velocity on the tube coated wall and the wall reaction probability are computed. The method has been applied to acetylene and sulphur dioxide in nitrogen, depositing on marble powder. Consistent results are obtained with the denuder tube coated alternatively on its upper or lower part, and the diffusion coefficients are in good agreement with those calculated theoretically.
Simple measurement of deposition velocities and wall reaction probabilities in denuder tubes—II. High deposition velocities
Arvanitopoulou, E. (author) / Katsanos, N.A. (author) / Metaxa, H. (author) / Roubani-Kalantzopoulou, F. (author)
Atmospheric Environment ; 28 ; 2407-2412
1994-02-14
6 pages
Article (Journal)
Electronic Resource
English
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