Abstract:2224HELVETICA CHIMICA ACTA.Rechts und links von der Laufbahn der Alkali-Ionen bleiben die Ca"-Ionen im Papier, weil sie nicht verdrangt werden, bei einer solchen Chromatographie an ihrem Platz, was zeigt, dass das Losungsmittel allein die Ablijsung der Ca**-Ionen nicht verursacht.2 us a m me nf a s s ung. Es wurden mit NH,-haltigen Cadmiumacetatlosungen im Papierchromatogramm Aufspaltungen bis zu 3 Flecken (Multipots) erhalten.Universitat Rasel, Anstalt fur anorganische Chemie.
“…The heat of adsorption at intermediate loading levels is somewhat below the heat of condensation, which is 4.01 kcal/mol, but rises as adsorption proceeds. The values found in this study are lower than those of Gubeli and Stori (1954), who found values between 6.86 and 7.82 kcal/mol for radon adsorption on carbon in the presence of N2. However, it should be noted that the surface characteristics of the two charcoals probably are not the same.…”
Section: Resultscontrasting
confidence: 91%
“…A few studies are available in the literature that have dealt with the measurement of equilibrium radon adsorption data. Gubeli and Stammbach (1951) obtained adsorption isotherms of radon in air on activated carbon in the temperature range 273-393 K. Later, Gubeli and Stori (1954) also obtained adsorption isotherm data for radon on elm-wood carbon using hydrogen, nitrogen, and carbon dioxide as carrier gases at atmospheric pressure. The isotherms of radon on both types of carbon were linear.…”
“…The heat of adsorption at intermediate loading levels is somewhat below the heat of condensation, which is 4.01 kcal/mol, but rises as adsorption proceeds. The values found in this study are lower than those of Gubeli and Stori (1954), who found values between 6.86 and 7.82 kcal/mol for radon adsorption on carbon in the presence of N2. However, it should be noted that the surface characteristics of the two charcoals probably are not the same.…”
Section: Resultscontrasting
confidence: 91%
“…A few studies are available in the literature that have dealt with the measurement of equilibrium radon adsorption data. Gubeli and Stammbach (1951) obtained adsorption isotherms of radon in air on activated carbon in the temperature range 273-393 K. Later, Gubeli and Stori (1954) also obtained adsorption isotherm data for radon on elm-wood carbon using hydrogen, nitrogen, and carbon dioxide as carrier gases at atmospheric pressure. The isotherms of radon on both types of carbon were linear.…”
“… a The adsorption enthalpies were determined by isothermal gas chromatography (refs −28, 35), from adsorption isotherm or isostere (dynamic: refs , , , ; static: refs , ), by calorimetry (ref ), and from a literature survey (refs , −24, 30−32). …”
The differential molar adsorption enthalpy of radon at zero coverage on the surface of laboratory made ice was determined by the method of low-temperature thermochromatography. Spherical ice particles were prepared as the stationary phase. For the investigation, the short-lived radon isotope 220 Rn was used, generated with a 232 U-emanation source. Helium served as carrier gas. At a temperature of about 100 K, sharp adsorption peaks of the 220 Rn atoms (∼10 8 ) were measured. From the measured deposition temperatures the adsorption enthalpy on the surface of the ice spheres was determined as ∆H ads ) -19.2 ( 1.6 kJ/mol. This value is compared with data from the literature for adsorption enthalpies of radon on different solid surfaces. From the estimated solution enthalpy of radon in water and the formation enthalpy of a hypothetical "Rn chlathrate hydrate", it follows that Rn is adsorbed on the ice surface as a free atom. The measured adsorption enthalpy indicates that Rn and ice are not isomorphous and that Rn shows no solubility in the solid phase.
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