微酸性溶液中における二酸化窒素からの鉄(II)-EDTA-ニトロシル錯体生成過程

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Formation process of nitrosyl-ethylenediam-inetetraacetato-iron (n) complex from nitrogen dioxide in a weakly acidic solution. Shunichi UCHIYAMA and Giichi MUTO (Faculty of Environmental Technology, 1690, Fusaiji, Okabe-machi, Osato-gun, Saitama) Formation of nitrosyl-ethylenediaminetetraacetatoiron (II) complex, Fe(II)NO-EDTA, by absorption of nitrogen dioxide to the iron(II)-EDTA aqueous solution was studied by controlled potential electrolysis and spectrophotometry. The NO_2 introduced into the iron (II) -EDTA aqueous solution was converted to HNO_2 and HNO_3 as eqns. (1), (2), and Fe (II) NO-EDTA was formed from the reaction of HNO_2 and iron (II) EDTA but HNO_3 did not react with iron-(II) EDTA. 2NO_2 + H_2O-->HNO_2 + HNO_3 ............(1) NO_2 + Fe (II) EDTA + H + --> Fe (III) EDTA + HNO_2 ............(2) In the reaction (1) one mole of HNO_2 was formed from two moles of NO_2, in the reaction (2) on the other hand, from one mole of NO_2. The experimental result of the conversion rate of NO2 to Fe (II) NO-EDTA was increased with increasing iron (II) EDTA concentration and at high iron (II) EDTA concentration, 0.2 mol dm^<-3>, the conversion rate was increased up to about 1.0. The total determinations of NO and NO_2 should be carried out in the absorbent with high iron (II) EDTA concentration. (Received Oct. 30, 1980)
社団法人日本分析化学会の論文
1981-04-05