Determination of nitric oxide by bromate oxidation of the nitrosyl ethylenediaminetetra-acetatoiron(II) complex

A new spectrophotometric method for nitric oxide is proposed, based on formation of the nitrosyl-ethylenediaminetetra-acetatoiron(II) complex Fe(II)NO-edta] by absorption of NO in Fe(II)edta solution and spectrophotometric determination of the NO(-)(2) produced by oxidation of the Fe(II)NO-edta complex by potassium bromate. The oxidation is easily performed completely and the absorption efficiency for 10.1-102.0 ppm NO (flow-rate, 100 ml/min) is nearly 100%. The detection limit is about 3 ppm for a sampling absorption time of 30 min.