Journal article
Ion-selective optode nanospheres as heterogeneous indicator reagents in complexometric titrations.
- 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.
- Language
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- English
- Open access status
- closed
- Identifiers
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- DOI 10.1021/ac504213q
- PMID 25622089
- Persistent URL
- https://sonar.ch/global/documents/269267
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