Flow injection voltammetric determination of nitrite by reduction at a glassy carbon electrode in acidic bromide or chloride media

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Abstract
Nitrite can be determined by reduction at a glassy carbon electrode held at +0.3 V versus a saturated calomel electrode by flow injection voltammetry at concentrations of greater than 1 × 10–6 M by direct injection of sample solution (25 µl) into an eluent 3.2 M in hydrochloric acid and 20%m/V in potassium bromide. Alternatively, the nitrite may be pre-reacted with acidic bromide before injection and determined at concentrations above 1 × 10–7 M. The use of an acidic chloride medium is less satisfactory.

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