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

Autor:	Sorin Kihara, Tomohiko Okugaki, Kohji Maeda, Yayoi Shibafuji, Megumi Kasuno, Yuri Kakitani, Takayuki Matsushita
Rok vydání:	2009
Předmět:	Electrolysis Aqueous solution Inorganic chemistry Analytical chemistry chemistry.chemical_element Electrolyte Calcium Analytical Chemistry law.invention Coulometry Flow system chemistry law Electrochemistry Ion transfer skin and connective tissue diseases
Zdroj:	Electroanalysis. 21:2022-2029
ISSN:	1521-4109 1040-0397
DOI:	10.1002/elan.200904616
Popis:	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.
Databáze:	OpenAIRE
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