Rapid and Precise Coulometric Determination of Calcium Based on Electrolysis for Ion Transfer at the Aqueous|Organic Solution Interface

A flow system was developed for the precise determination of Ca2+ based on the electrolytic ion transfer at the aqueous|1,2‐dichloroethane, W|DCE, interface. N,N,N′,N′‐tetraoctyl‐1,3‐oxapentanediamide was added to DCE to facilitate the transfer of Ca2+. The determination of Ca2+ could be achieved wi...

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Published inElectroanalysis (New York, N.Y.) Vol. 21; no. 17-18; pp. 2022 - 2029
Main Authors Kasuno, Megumi, Kakitani, Yuri, Shibafuji, Yayoi, Okugaki, Tomohiko, Maeda, Kohji, Matsushita, Takayuki, Kihara, Sorin
Format Journal Article
LanguageEnglish
Published Weinheim WILEY-VCH Verlag 01.09.2009
WILEY‐VCH Verlag
Subjects
Calcium
Electrolysis
Flow coulometry
Immiscible electrolyte solutions
Interfaces
Ion transfer
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Summary:A flow system was developed for the precise determination of Ca2+ based on the electrolytic ion transfer at the aqueous|1,2‐dichloroethane, W|DCE, interface. N,N,N′,N′‐tetraoctyl‐1,3‐oxapentanediamide was added to DCE to facilitate the transfer of Ca2+. The determination of Ca2+ could be achieved with an efficiency of 99.9±0.1% based on the coulomb number for the transfer of Ca2+. The coexistence of Mg2+, Na+, or K+ of concentration identical with that of Ca2+ did not give any interference. The interference from a large excess of Na+ was removed at another cell with DCE containing bis[(12‐crown‐4)methyl]‐2‐dodecyl‐2‐methylmalonate placed before the cell for the determination.
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ISSN:1040-0397
1521-4109
DOI:10.1002/elan.200904616