A potentiometric flow injection determination method for cationic polyelectrolytes utilizing a flow-through-type tetraphenylborate-selective electrode detector is described. The method is based on detecting any concentration decrease of the tetraphenylborate ion by the formation of an ion associate between cationic polyelectrolyte, poly(diallyl-dimethylammonium chloride) (Cat-floc) and tetraphenylborate ion. The response of the electrode detector, as a peak-shaped signal, was obtained for injected cationic polyelectrolyte samples. A linear relationship was found to exist between the peak height and the logarithmic concentration of Cat-floc with a slope of 17 mV/decade over a concentration range of 5 × 10-5 to 1 × 10-3 mol 1-1 . The detection limit for Cat-floc was 1 × 10-5 mol 1-1. The sampling rate was ca. 12 samples/h.
- Cationic polyelectrolytes
- Flow injection analysis
- Ion associate
- Plasticized poly(vinyl chloride) membrane
- Tetraphenylborate-selective electrode
ASJC Scopus subject areas
- Analytical Chemistry