Abstract
A sensitive and selective single-sweep polarographic method for the determination of trace amounts of nitrite is reported, based on the formation of a ternary complex in an acidic medium (pH 2) containing cobalt(II), thiocyanate and ascorbic acid. The complex, corresponding to [CoSCNNO]+, is strongly adsorbed on a mercury electrode surface and an adsorptive polarographic wave appears at −0.59 V (vs. SCE). The single-sweep polarographic wave is used for the determination of nitrite in the concentration range 1 × 10−8−8 × 10−7 M. The polarographic wave is ascribed to the reduction of nitrogen monoxide in the complex to hydroxylamine. The procedure has been applied to the direct determination of nitrite in various samples.
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