An optosensor based on the fluorescence of metal complexes adsorbed on Chelex 100

A flow optosensor for A13+, Ga3+, In3+, Zr4+ and Hf4+ based on their ternary complexes with quinolin-8-ol-5-sulfonate and the chelating resin of Chelex 100 is proposed. It was shown that the optosensor can greatly improve the selectivity and sensitivity for determination of these metal ions. Most of the common metal ions did not interfere, except FeIII which caused serious interference and should be masked with 1,10-phenanthroline. The characteristics of the fluorescence and the response mechanism has also been studied.