title: Colloidal titration of aqueous zirconium solutions with poly(vinyl sulfate) by potentiometric endpoint detection using a toluidine blue selective electrode.
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 < or = 2 was one mol of zirconium per equivalent mol of poly(vinyl sulfate).
authors.affiliation: Department of Materials Science and Technology, Faculty of Engineering, Gifu University, Gifu 501-1193, Japan. sakurada@apchem.gifu-u.ac.jp
authors.forename: Osamu
authors.initials: O
authors.lastname: Sakurada
authors.forename: Yasutake
authors.initials: Y
authors.lastname: Kato
authors.forename: Noriyoshi
authors.initials: N
authors.lastname: Kito
authors.forename: Keiichi
authors.initials: K
authors.lastname: Kameyama
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Hattori
authors.forename: Minoru
authors.initials: M
authors.lastname: Hashiba