Potentiometry of effective concentration of polyacrylate as scale inhibitor.
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.
Yuchi
Akio
A
Nagoya Institute of Technology, Graduate School of Engineering, Gokiso, Showa, Nagoya 466-8555, Japan. yuchi.akio@nitech.ac.jp
Gotoh
Yasumasa
Y
Itoh
Shinsuke
S