Oxidation of cobalt(II) with air oxygen in aqueous ethylenediamine solutions
Oxidation of aqueous Co(NO^sub 3^)^sub 2^-ethylenediamine (En) solutions with air oxygen was investigated at 20 °C and pH 5.2-7.0, with and without mechanical stirring, by measuring the Co^sup II^ concentration, pH and redox potential on an Au electrode. In most cases, the oxidation rate was proport...
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| Veröffentlicht in: | Transition metal chemistry (Weinheim) 2001-01, Vol.26 (4-5), p.465 |
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| container_title | Transition metal chemistry (Weinheim) |
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| creator | Norkus, Eugenijus Vaskelis, Algirdas Grigucevicien, Asta Rozovskis, Grigorijus Reklaitis, Jonas Norkus, Povilas |
| description | Oxidation of aqueous Co(NO^sub 3^)^sub 2^-ethylenediamine (En) solutions with air oxygen was investigated at 20 °C and pH 5.2-7.0, with and without mechanical stirring, by measuring the Co^sup II^ concentration, pH and redox potential on an Au electrode. In most cases, the oxidation rate was proportional to the concentration of CoEn^sup 2+^^sub n^ (n = 2, 3) complexes, and the influence of the solution pH on the rate of reaction was accounted for by the pH dependence of the Co^sup II^ complex distribution. It was found that sulphate inhibits and bromide accelerates the oxidation process. Possible oxidation routes are discussed. The oxidation process is limited to some extent by O^sub 2^ transport from the air to the bulk solution.[PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1023/A:1011051222928 |
| format | Article |
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In most cases, the oxidation rate was proportional to the concentration of CoEn^sup 2+^^sub n^ (n = 2, 3) complexes, and the influence of the solution pH on the rate of reaction was accounted for by the pH dependence of the Co^sup II^ complex distribution. It was found that sulphate inhibits and bromide accelerates the oxidation process. Possible oxidation routes are discussed. 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In most cases, the oxidation rate was proportional to the concentration of CoEn^sup 2+^^sub n^ (n = 2, 3) complexes, and the influence of the solution pH on the rate of reaction was accounted for by the pH dependence of the Co^sup II^ complex distribution. It was found that sulphate inhibits and bromide accelerates the oxidation process. Possible oxidation routes are discussed. 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| language | eng |
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| source | SpringerNature Journals |
| subjects | Oxidation |
| title | Oxidation of cobalt(II) with air oxygen in aqueous ethylenediamine solutions |
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