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Flow-through calcium-selective electrode: application in flow-injection analysis and ion chromatography

✍ Scribed by N. Kolycheva; H. Müller

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
565 KB
Volume
242
Category
Article
ISSN
0003-2670

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✦ Synopsis

The use of solid contact flow-through calcium-selective electrodes as potentiometric detectors in flow-injection analysis and non-suppressed ion chromatography is discussed. Owing to the high selectivity of the membrane electrode based on tetratolyl-m-xylylenediphosphine dioxide, it can be used to monitor trace amounts of calcium ions in the presence of a lOO-fold excess of alkali metal, ammonium and magnesium ions. The detection limit is about 1 x 10m6 M. The composition and thickness of the calcium selective membrane influence both the detection limit and selectivity of the electrode. The sensitivity of this potentiometric detector in ion chromatography relative to alkaline earth and heavy metals is significantly higher than that of a commercial conductivity detector.

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