Potentiometry of Anionic Polyelectrolytes by Quaternary Ammonium Ion-Selective Electrode with Quaternary Ammonium Ion Added as Probe

✍ Scribed by Xiang-Yang Zheng; Daisaku Yano; Takashi Yasui; Kazutake Takada; Akio Yuchi

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 320 KB
• Volume: 21
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200904610

✦ Synopsis

Abstract

For potentiometric determination of anionic polyelectrolytes (APEs), the free concentration of water‐soluble quaternary ammonium cation (QA^+^) added as a probe was measured with a quaternary ammonium ion‐selective electrode. The optimized detection of polyacrylate as one example of APEs demonstrated that the quaternary ammonium ions with a single alkyl group >C~15~ had large potential changes (−80 mV for C~16~ and −130 mV for C~18~) within a concentration range of 10^−6^–10^−4^ mol dm^−3^. The response was rapid (several minutes) and independent of pH>8 and showed no hysteresis. APEs with other anionic functional groups, for example, heparin and poly(4‐styrenesulfonate), were also detected.