Colloidal titration of aqueous zirconium solutions with poly(vinyl sulfate) by potentiometric endpoint detection using a toluidine blue selective electrode.
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).
Sakurada
Osamu
O
Department of Materials Science and Technology, Faculty of Engineering, Gifu University, Gifu 501-1193, Japan. sakurada@apchem.gifu-u.ac.jp
Kato
Yasutake
Y
Kito
Noriyoshi
N
Kameyama
Keiichi
K
Hattori
Toshiaki
T
Hashiba
Minoru
M