Use of marker ion and cationic surfactant plastic membrane electrode for potentiometric titration of cationic polyelectrolytes |
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| Authors: | Masadome Takashi Imato Toshihiko |
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| Institution: | a Department of Chemical Science and Engineering, Ariake National College of Technology, Omuta, Fukuoka 836-8585, Japan
b Department of Chemical Systems Engineering, Graduate School of Engineering, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan |
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| Abstract: | A plasticized poly (vinyl chloride) (PVC) membrane electrode sensitive to stearyltrimethylammonium (STA) ion is applied to the determination of cationic polyelectrolytes such as poly (diallyldimethylammonium chloride) (Cat-floc) by potentiometric titration, using a potassium poly (vinyl sulfate) (PVSK) solution as a titrant. The end-point of the titration is detected as the potential change of the plasticized PVC membrane electrode caused by decrease in the concentration of STA ion added to the sample solution as a marker ion due to the ion association reaction between the STA ion and PVSK. The effects of the concentration of STA ion, coexisting electrolytes in the sample solution and pH of the sample on the degree of the potential change at the end-point were examined. A linear relationship between the concentration of cationic polyelectrolyte and the end-point volume of the titrant exists in the concentration range from 2×10−5 to 4×10−4 N for Cat-floc, glycol chitosan, and methylglycol chitosan. |
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| Keywords: | Potentiometric titration Cationic polyelectrolyte Colloidal titration Surfactant-ISE Glycol chitosan Methylglycol chitosan Poly (diallyldimethylammonium chloride) |
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