Abstract The sorption calorimetry method developed by Wadso and co-workers is one of the most successful methods for studying the enthalpy of vapor sorption by solids and gels. A unique feature of this method is a simultaneous measurement of the water sorption isotherm and the sorption enthalpy. The accuracy of the enthalpy measurements in sorption calorimetric experiments can be affected by diffusion of water vapour through the injection channel tube and potentially through small leaks in the sorption cell. At high water activities this leads to an apparent drift of the measured enthalpies towards endothermic values. In this work we propose an improvement of the enthalpy calculation method, that eliminates these effects and substantially improves the accuracy of the enthalpy measurements. The new method is successfully tested on previously published sorption calorimetric data and can be recommended for use in future experiments.

中文翻译：

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吸附量热实验中热力学参数的计算

摘要 Wadso 及其同事开发的吸附量热法是研究固体和凝胶蒸气吸附焓最成功的方法之一。这种方法的一个独特之处是同时测量水吸附等温线和吸附焓。吸附量热实验中焓测量的准确性可能会受到水蒸气通过注入通道管的扩散以及吸附池中小泄漏的潜在影响。在高水活度下，这会导致测得的焓向吸热值明显漂移。在这项工作中，我们提出了焓计算方法的改进，消除了这些影响并大大提高了焓测量的准确性。