Abstract

This paper presents a study of the migration of inorganic ions on thin layers of silica gel employing acetone and nitric acid mixtures as solvents. According to the trend of their RF values with increasing acid percentage, ions are divided into five groups: ions of low or zero mobility, ions of gradually increasing mobility, ions migrating promptly with a very low percentage of acid, ions showing high but rather fairly constant mobility, and ions showing characteristic behaviour. This behaviour is mainly explained on the basis of solubility and differing tendency to anionic nitrate complex formation. The results are related to those already obtained with acetone-hydrochloric acid system. The separations of some mixtures of ions are finally presented as examples of analytical possibilities with tested eluent systems.

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