Development of an optode membrane for high pH values.
The development of an optical pH sensor for high pH values is described based on the immobilization of Aniline Blue on an optically transparent triacetylcellulose membrane. The membrane is useful for repetitive and reversible pH measurements in the pH range of 8.8-13. The relative standard deviation is about 1.6% and 2% for seven measurements of the maximum change at 579 nm from pH 9 to 10.8 and from pH 11.1 to 12.8, respectively. Other advantages of the sensor include rapid equilibration time, long term stability, reversibility, high sensitivity, freedom from interference of other cations and ease of fabrication.
Safavi
Afsaneh
A
Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 71454, Iran. safavi@chem.susc.ac.ir
Sadeghi
Marzieh
M
D000814:Aniline Compounds / Q000737:chemistry; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D008567:Membranes, Artificial; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors
D000814:Aniline Compounds; D008567:Membranes, Artificial; D012996:Solutions; C017006:aniline blue