Ionophore‐based Heterogeneous Calcium Optical Titration,Electroanalysis

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Ionophore‐based Heterogeneous Calcium Optical Titration
Electroanalysis ( IF 2.7 ) Pub Date : 2017-12-21 , DOI: 10.1002/elan.201700690
Jingying Zhai ₁ , Changyou Zhu ₁ , Xinlei Peng ₁ , Xiaojiang Xie ₁

Affiliation

Recently, the field of complexometric titration significantly progressed with the advent of ionophore‐based titration reagents. We present here for the first time an ionophore‐based heterogeneous optical titration method for calcium. The all‐in‐one reagent was composed of chromoionophore, ion‐exchanger and calcium ionophore in dichloromethane (DCM). The endpoint of this reverse titration scheme was determined by the color change of the DCM phase (blue to red). The ion‐exchange theory borrowed from ISE membranes was used to simulate the titration curve in a simplified manner. The phase separation speed during titration was found much faster at and beyond the endpoint. A mechanism was proposed for this phenomenon, with zeta‐potential measurements on ion‐selective nanospheres to support the hypothesis. Calcium titration in a urine sample was also successfully demonstrated and compared with EDTA titration with potentiometric ion‐selective electrodes as endpoint indicator. The proposed reagent serves as an alternative to the classical EDTA.

中文翻译：

基于离子载体的异质钙光学滴定

最近，随着基于离子载体的滴定剂的出现，络合滴定领域有了长足的发展。我们首次在此展示基于离子载体的钙的异质光学滴定方法。一体化试剂由二氯甲烷中的生色团，离子交换剂和钙离子团组成。该反滴定方案的终点由DCM相的颜色变化（蓝色到红色）确定。从ISE膜上借用的离子交换理论以简化的方式模拟了滴定曲线。发现滴定期间的终点和终点处的相分离速度要快得多。提出了一种针对这种现象的机制，并在离子选择性纳米球上进行了ζ电势测量以支持该假设。还成功地证明了尿液样品中的钙滴定，并与以电位离子选择电极作为终点指示剂的EDTA滴定进行了比较。拟议的试剂可替代传统的EDTA。

更新日期：2017-12-21

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