Abstract
Color reactions of lanthanum with reagents of the arsenazo III group on the solid phase of fibrous materials filled with an ion exchanger are studied. Substrates and reagents of various types, sorption and complexation conditions, and effects of some concomitant components are investigated. The most pronounced analytical effect is observed upon lanthanum sorption on disks with an anion exchanger containing iminodiacetate ANKB-50 groups followed by complexation on the solid phase with arsenazo III or arsenazo M in 0.05 M HCl. The reaction with arsenazo III is characterized by the lowest detection limit (5 ng/mL), and the reaction with arsenazo M is most selective.
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