Alternating Current Tensammetry of Tetraphenylborate (TPB) and its Application for Potassium Determination

Alternating Current Tensammetry of Tetraphenylborate (TPB) and its Application for Potassium Determination

Alternating‐current polarography of tetraphenylborate ion (TPB) in acetate buffer (pH 4 to 5) or 0.1 to 0.5 M NaCl produces a characteristic tensammetric (pseudocapacitive) peak at −0.95 V (vs. SCE). Within a limited range (till about 0.2 mM), the tensammetric peak current is proportional to the TPB...

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Veröffentlicht in:Electroanalysis (New York, N.Y.) N.Y.), 2003-09, Vol.15 (17), p.1415-1418
Hauptverfasser: Ion, Ana, Costache, Madalina Beatrice, Grecu, I. V., Banica, F. G.
Format: Artikel
Sprache:eng
Schlagworte:
Alternating current polarography
Amperometric titration
Mineral water
Potassium determination
Tensammetry
Tetraphenylborate
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Zusammenfassung:Alternating‐current polarography of tetraphenylborate ion (TPB) in acetate buffer (pH 4 to 5) or 0.1 to 0.5 M NaCl produces a characteristic tensammetric (pseudocapacitive) peak at −0.95 V (vs. SCE). Within a limited range (till about 0.2 mM), the tensammetric peak current is proportional to the TPB concentration but it levels off at higher concentration. TPB concentration can also be determined within 5 to 50 μM by measuring the capacity current at −0.4 V or the differential pulse polarographic peak current at −0.85 V. The tensammetric peak current was used to determine the solubility of potassium tetraphenylborate in acetate buffer and sodium chloride solutions. Also, a method for amperometric back‐titration of potassium ion was worked out and applied to the analysis of mineral water.
ISSN:1040-0397
1521-4109
DOI:10.1002/elan.200302733