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Ion-selective optode nanospheres as heterogeneous indicator reagents in complexometric titrations.
Journal article

Ion-selective optode nanospheres as heterogeneous indicator reagents in complexometric titrations.

  • Zhai J Department of Inorganic and Analytical Chemistry, University of Geneva , Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland.
  • Xie X
  • Bakker E
  • 2015-01-27
Published in:
  • Analytical chemistry. - 2015
English Traditionally, optical titrations of inorganic ions are based on a rapid and visible color change at the end point with water-soluble organic dyes as indicators. Adequate selectivity is required for both the indicator and the complexing agent, which is often limited. We present here alternative, heterogeneous ionophore-based ion-selective nanospheres as indicators and chelators for optical titrations. The indicating nanospheres rely on a weaker extraction of the analyte of interest by ion-exchange, owing to the additional incorporation of a lipophilic pH indicator in the nanosphere core. Ca(2+) titration was demonstrated as a proof-of-concept. Both the chelating and the indicating nanospheres showed good selectivity and a wide working pH range.
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  • English
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closed
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https://sonar.ch/global/documents/269267
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