Abstract
Differential titration and potentiometric titration, and C. Winkler's method have often been used for the determination of sodium hydroxide and sodium carbonate in brine. However, those water samples containing small amounts of minerals and brine, have buffering capacity against an addition of hydrochloric acid, and therefore the former methods are unsuitable for the determination of them.An investigation has been made in. this paper on the application of a fluorescence method for the analysis of sodium hydroxide and carbonate (sodium alkali) in brine. This method based on the fluorescence due to the reaction between ο-phenylphenol and the sodium alkali under ultraviolet rays. The fluorescence intensity is very stable, and by this simple and rapid method proposed here, sodium hydroxide and sodium carbonate in brine can be satisfactorily analysed. Calcium chloride and magnesium chloride give no influence, and one sample can be analysed within about 30 minutes with an accuracy enough for practical use. The limits of the determination of NaOH and Na2CO3 are 0.4 mg/l in both cases.
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