Abstract
Iron(II) in nitric acid solution can be titrated with dichromate (and vice versa), diphenylamine, N-phenylanthranilic acid, ferroin, or brucine being used as indicator. Fluoride is added when one of the first three is used, and urea if the last is used. Citric, oxalic and tartaric acids, arsenic(III) and mercury(I) interfere in the titration.
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