A chelate-forming resin prepared by the modification of anion-exchange resin amberlyst A-26 with thoron and its application

Application of chelate-forming resin and modified glassy carbon electrode for selective determination of iron(III) by liquid chromatography with electrochemical detection

“…The procedure was developed on the basis of the results reported by Brajter and Zlotorzynska (32). The thoron resin (weight of resin, 0.1 g; 0.2 mmol of thoron/g of resin) was used to pack a glass column with the diameter of 5.8 mm.…”

“…Separation was accomplished by introduction of 2 mL of the sample Fe(III)solution containing 1-2 drops of 0.01 M thoron and 0.1 M trien at pH 9.2-10.1 onto the column. Iron quantitatively retained on the resin (32) was eluted with 1 M HC1-1 M KC1 solution at the rate of about 5 mL min"1. Although a complete elution occurred within 5 min, the eluent was still transported for 2-3 min to wash the column and ensure full desorption of all sample components.…”

“…Before each sample introduction, the resin was pretreated by passing distilled water at a flow rate of 1 mL min"1. Since the resin bed could be used several times (32), it was not regenerated during the series of experiments.…”

“…A remarkable success in the early work with inorganic films, namely with mixed-valent metal cyanide complexes (21-27), is encouraging. On the other hand, the application of chelate-forming resins (28)(29)(30)(31)(32), obtained by the modification of common anion exchangers with sulfo derivatives of aromatic complexing agents, should be also beneficial for better control of the chromatographic separation. These resins exhibit the selectivity toward metal cations which depends on coordinating abilities of the complexing agents used for the resin modification.…”

“…From the reported properties, it appears that a Ni2+-Fe(CN)63"4" system may form a stable film on a glassy carbon substrate, a popular electrode material, and have the electrochemical characteristics and long-term performance required for the indicator in an amperometric detector. Finally, as far as separation and enrichment of Fe(III) are concerned, a new development by Brajter and Zlotorzynska (32) in the field of chelate-forming resins that exploits a simple modification of a macroporous anion exchanger with thoron is of particular interest.…”