title: Potentiometry of effective concentration of polyacrylate as scale inhibitor.
abstract: The concentration of polyacrylate (PA) used as a scale inhibitor was potentiometrically determined with a solid state copper ion-selective electrode after addition of Cu2+ as a probe. While the conventional methods monitor only the total concentration of PA, the proposed method measures the free, "effective" concentration of PA in equilibrium with species like Ca2+ and CaCO3. The slope of a potential response to PA was -40 mV decade(-1) and the limit of detection was 10(-6.3) M (= mol dm(-3)) at a probe concentration of 10(-6) M. The system could be used to control the PA concentration just enough to prevent the scale formation in various circulating water systems.
authors.affiliation: Nagoya Institute of Technology, Graduate School of Engineering, Gokiso, Showa, Nagoya 466-8555, Japan. yuchi.akio@nitech.ac.jp
authors.forename: Akio
authors.initials: A
authors.lastname: Yuchi
authors.forename: Yasumasa
authors.initials: Y
authors.lastname: Gotoh
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Itoh