This paper describes the development of a fibre optic sensor incorporating an LED source and solid-state photodiode detection for the determination of the pH of solutions containing the indicator phenol red. The sensor can be used in, for example, liquid titration studies. This inexpensive and rapid response device is shown to have a reproducible characteristic output, with a low response change at elevated temperatures.
N. Benaim, K. T. V. Grattan and A. W. Palmer, Analyst, 1986, 111, 1095 DOI: 10.1039/AN9861101095
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