Paper chromatography of some chelating reagents containing sulfonic groups in liquid-liquid anion exchange systems

Summary Chromatographic behaviour of nine chelating reagents in chloride and perchlorate systems was investigated with two methods: paper extraction chromatography and moist paper technique. It was found that the affinity of the reagents to cellulose treated with liquid anion exchangers decrease in the following orders: Eriochrome cyanine R>Chromazurol S>Pyrocatechol violet, and Alizarin S>ferron>chromotropic acid nitroso-R-salt>sulfosalicylic acid>tiron. The results obtained suggest that the retention of reagents in extraction chromatography is caused not only by anion-exchange process but also by adsorption and probably also by partition phenomena. The number of alkylammonium cations forming extracted species with reagents depends on the number of sulfonic groups in the reagent molecule but in sulfosalicylic acid carboxylic group can also be partially bound.