Error magnitudes in extrapolated approximations of sorbent retention volumes obtained by using temperature-dependent vapor pressures |
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| Institution: | 1. Laboratoire Énergie Solaire et Économie d''Énergie (LESEE), Département Génie Électrique, Énergétique et Industriel, Institut International d''Ingénierie de l''Eau et de l''Environnement (2iE), 01 BP 594 Ouagadougou 01, Burkina Faso;2. CNR – Istituto di Tecnologie Avanzate per l''Energia “Nicola Giordano”, Via Salita S. Lucia sopra Contesse 5, 98126 Santa Lucia, Messina, Italy;3. Innovation Incubator “Competence Tandem Thermal Battery”, Leuphana University Lüneburg, Scharnhorststraße 1, 21335 Lüneburg, Germany;4. PROMES-CNRS, Université de Perpignan Via Domitia, Tecnosud, Rambla de la Thermodynamique, 66100 Perpignan, France |
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| Abstract: | The temperature dependence of the vapor pressure of a compound can be used to obtain an estimate of the effects of temperature (T, K) on the retention volume of that compound on sorbents used in gas sampling. Since the T-dependence of the vapor pressure depends on the enthalpy of vaporization ΔHv and not on the enthalpy of desorption ΔHs from the sorbent surface itself, such an estimate will be subject to error. Let T2 be the temperature at which an estimate of the retention volume is desired, and let T1 be the temperature at which the retention volume is known. The magnitude of the error will then increase as the magnitudes of (T2 − T1) and (ΔHs − ΔHv) increase. If both ΔHs and ΔHv are independent of T over the range of interest, then the error will be zero when either (T2− T1) or (ΔHs−ΔHv) is zero. |
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