Colorimetric determination of nitrites with p-diaminodiphenylsulphone-diphen-ylamine as reagent.
Diaminodiphenylsulphone-diphenylamine is used in a new colorimetric method for the determination of nitrite over a range of 0.1-2.5 mg/l . at pH 1.8 and 0.22-0.4 mg/l . at pH about 0.1. The coloured solutions are stable, follow Beer's law and are suitable for determination of traces by visual comparison. The method is selective and neither chlorine nor nitrogen trichloride gives similar colour reactions.
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Negev Institute for Arid Zone Research, Beersheva, Israel.