Colloidal Titration of Aqueous Zirconium Solutions with Poly(vinyl sulfate) by Potentiometric Endpoint Detection Using a Toluidine Blue Selective Electrode

Osamu SAKURADA; Yasutake KATO; Noriyoshi KITO; Keiichi KAMEYAMA; Toshiaki HATTORI; Minoru HASHIBA

doi:10.2116/analsci.20.311

Original Papers

Colloidal Titration of Aqueous Zirconium Solutions with Poly(vinyl sulfate) by Potentiometric Endpoint Detection Using a Toluidine Blue Selective Electrode

Osamu SAKURADA, Yasutake KATO, Noriyoshi KITO, Keiichi KAMEYAMA, Toshiaki HATTORI, Minoru HASHIBA

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JOURNAL FREE ACCESS

2004 Volume 20 Issue 2 Pages 311-314

DOI https://doi.org/10.2116/analsci.20.311

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Abstract

Zirconium oxy-salts were hydrolyzed to form positively charged polymer or cluster species in acidic solutions. The zirconium hydrolyzed polymer was found to react with a negatively charged polyelectrolyte, such as poly(vinyl sulfate), and to form a stoichiometric polyion complex. Thus, colloidal titration with poly(vinyl sulfate) was applied to measure the zirconium concentration in an acidic solution by using a Toluidine Blue selective plasticized poly(vinyl chloride) membrane electrode as a potentiometric end-point detecting device. The determination could be performed with 1% of the relative standard deviation. The colloidal titration stoichiometry at pH ≤ 2 was one mol of zirconium per equivalent mol of poly(vinyl sulfate).

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