J Solution Chem https://doi.org/10.1007/s10953-018-0759-3 Application of Hygroscopic Gravimetric Analysis Method in Isopiestic Measurements. Quality Control of Initial Reagents Anatoly G. Tereshchenko Received: 3 October 2017 / Accepted: 13 February 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018 Abstract A variant of the hygroscopic gravimetric technique is developed for the esti- mation of the total content of soluble impurities in solid crystalline chemical reagents, by considering water vapor sorption from an atmosphere with a definite relative humidity. The technique makes it possible to estimate the main component content of a substance, pro- vided this substance is soluble in water. The proposed method is based on a simplified isopiestic measurement technique. An analyzed sample is divided into two portions: one is dried and weighed while the other is moistened up to 10–50% of the amount needed for the substance’s solubility. Both portions are then placed in cups in a desiccator and held for 24 h; water absorption of the initially dry sample is then determined. The feasibility of the method is demonstrated for NaCl and KCl systems (reagents and technical products) of different purities. The effect of impurities (KCl, MgCl , LiCl) on water vapor absorption by NaCl is analyzed for the impurity contents
Journal of Solution Chemistry – Springer Journals
Published: May 31, 2018
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