Adsorption voltammetry of the vanadium-2-(5′-bromo-2′-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) system |
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Authors: | Jianmin Lu Wenrui Jin Shuyu Wang |
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Affiliation: | Department of Chemistry, Shandong Normal University, Jinan, Shandong China;Department of Chemistry, Shandong University, Jinan, Shandong China;Department of Chemistry, Shandong Normal University, Jinan, Shandong China |
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Abstract: | The behaviour of the vanadium(V) complex with 5-Br-PADAP at a mercury electrode was investigated in HOAcNaOAc. The adsorption phenomena were observed by linear-sweep voltammetry. The mechanism of the electrode reaction was found to be the irreversible reduction of the V(V) in the complex adsorbed on the surface of the electrode to the V(IV) complex with 5-Br-PADAP. In 0.02 mol l?1 HOAc-0.012 mol l?1 NaOAc (pH 4.5) and 1 × 10?6 mol l?1 5-Br-PADAP, the detection limits of linear-sweep adsorption voltammetry and 1.5th-order derivative adsorption voltammetry are 5 × 10?10 and 2.5 × 10?11 mol l?1 , respectively. The method was applied to samples of ore (Geological Deposit). |
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Keywords: | Vanadium Ores |
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