Chemically modified electrode based on poly[tetra(4-aminophenyl)porphyrin] as a pH sensor - Yuan, R.; Chai, Y.-Q.; Shen, G.-L.; Yu, R.-Q. (Elsevier)
A chemically modified platinum electrode with coated poly[tetra(4-aminophenyl)porphyrin] has been used as a potentiometric pH sensor. It gives a linear response over the pH range 1.5-13.7 with a slope of 55 mV/pH (at 20^o). The sensor has fair resistance to erosion of hydrofluoric acid and to interference of a coexisting redox couple. The sensor can be used for pH determination and end-point indication for potentiometric titration of hydrofluoric acid with sodium hydroxide. The a.c. impedance of the polymer membrane has also been studied.
http://linkinghub.elsevier.com/retrieve/pii/0039-9140(93)80195-W
Keywords: V