Indirect flow injection voltammetric determination of aromatic amines by monitoring at a glassy carbon electrode the excess of nitrite remaining after their diazotisation

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Abstract
Excess of nitrite, after reaction with aniline, sulphanilic acid or sulphanil-amide in the presence of potassium bromide, is determined by flow injection voltammetry at a glassy carbon electrode by injection of the reaction mixture into 0.3 M hydrochloric acid. The reaction is stoicheiometric but the amperometric signal is not directly proportional to the amine concentration. For the determination of these amines (1 × 10–6–1 × 10–4 M) the use of a 10–90% excess of nitrite is recommended. The amines have also been determined by direct injection of amine (1 × 10–8–1 × 10–4 M) in 3.2 M hydrochloric acid into a neutral eluent 1 × 10–4, 1 × 10–5 or 1 × 10–6 M in nitrite and 20%m/V in potassium bromide. The reaction was incomplete in this direct injection but good reproducibility was obtained.

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