CHEMICALLY-MODIFIED ELECTRODE BASED ON POLY[TETRA(4-AMINOPHENYL)PORPHYRIN] AS A PH SENSOR

Authors
YUAN R CHAI YQ SHEN GL YU RQ
Citation
R. Yuan et al., CHEMICALLY-MODIFIED ELECTRODE BASED ON POLY[TETRA(4-AMINOPHENYL)PORPHYRIN] AS A PH SENSOR, Talanta, 40(8), 1993, pp. 1255-1259
Citations number
16
Journal title
Talanta
ISSN journal
00399140 → ACNP
Volume
40
Issue
8
Year of publication
1993
Pages
1255 - 1259
Database
ISI
SICI code
0039-9140(1993)40:8<1255:CEBOP>2.0.ZU;2-E
Abstract
A chemically modified platinum electrode with coated poly[tetra(4-amin ophenyl)porphyrin] has been used as a potentiometric pH sensor. It giv es a linear response over the pH range 1.5-13.7 with a slope of 55 mV/ pH (at 20-degrees). The sensor has fair resistance to erosion of hydro fluoric acid and to interference of a coexisting redox couple. The sen sor can be used for pH determination and end-point indication for pote ntiometric titration of hydrofluoric acid with sodium hydroxide. The a .c. impedance of the polymer membrane has also been studied.