Abstract
The behavior of nitrogen dioxide were studied in ethylenediaminetetraacetato iron(II) {Fe(II)-edta} aqueous solutions at pH 4.2 and pH 8.5. Nitrogen gas including 3.0% of NO2 and the 0.019 mol dm-3 Fe (II)-edta solution of pH 4.2 or pH 8.5 were mixed in a gas cylinder, and the formed nitrosyl complex, Fe(II)NO-edta, was determined by polarography. The conversion rates of Fe(II)NO-edta from NO2 were 0.7 at pH 4.2, and 0.12 at pH 8.5. In the acidic solution, about 30% of absorbed NO2 is changed into some species (probably nitrate ion) which does not form the nitrosyl complex. On the other hand, in the alkaline solution the main product is estimated nitrite ion which does not react with the Fe(II)-edta at this pH value. The conversion rates of Fe(II)NO-edta from NO2 was raised to 0.82 when potassium iodide (0.96 mol dm-3) was added to the acidic solution. For the analysis of nitrogen oxides, the concentration of NO and NO2 can be given respectively by solving simultaneous equations shown as follows.Ca=CNO+0.82 CNO2Cb=CNO+0.12 CNO2where Ca and Cb are concentrations of Fe(II)NO-edta determined in the acidic solution containing potassium iodide and the alkaline solution respectively, and CNO and CNO2 are concentrations of NO and NO2 to be determined.
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