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Ion-Selective Optode Nanospheres as Heterogeneous Indicator Reagents in Complexometric Titrations

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Published in Analytical Chemistry. 2015, vol. 87, no. 5, p. 2827-2831
Abstract 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. Ca2+ 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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Other version: http://pubs.acs.org/doi/abs/10.1021/ac504213q
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Research group Groupe Bakker
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ZHAI, Jingying, XIE, Xiaojiang, BAKKER, Eric. Ion-Selective Optode Nanospheres as Heterogeneous Indicator Reagents in Complexometric Titrations. In: Analytical Chemistry, 2015, vol. 87, n° 5, p. 2827-2831. https://archive-ouverte.unige.ch/unige:75943

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Deposited on : 2015-10-12

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