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Sources of Error in Sorption and Density Measurements |
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| Authors: | Robens E Keller J U Massen C H Staudt R |
| Institution: | 1.Institut für Anorganische und Analytische Chemie der Johannes Gutenberg-Universität, D-55099, Mainz ;2.Institut für Fluid- und Thermodynamic, Universität — GH — Siegen, D-57068, Siegen, Germany ;3.Faculty of Applied Physics, Eindhoven University of Technology, P.O. Box 513, NL-5600 MB, Eindhoven, The Netherlands ; |
| Abstract: | In sorption measurements, volumetric or gravimetric procedures are commonly used to determine the amount adsorbed. At low pressures, thermomolecular flow and pressure differences according to Knudsen's law disturb measurements. In volumetry, calibration of the dead space is required; in gravimetry, the influence of buoyancy has to be taken into account. In both cases, adsorption of the calibrating gas, usually helium, may disturb the measurements 1]. From the calibration measurements, the density of the sample can in principle be calculated. However, it has been observed in many experiments that its value depends on the calibrating gas. This revised version was published online in July 2006 with corrections to the Cover Date. |
| Keywords: | buoyancy density helium Knudsen effect mass determination sorption thermomolecular flow |
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