引用本文:
金文睿, 姜玮. 镍(Ⅱ)-丁二肟体系的吸附伏安法研究[J]. 应用化学,
1985, 2(2): 1-6.
Citation: Jin Wenrui, Jiang Wei. ON THE ADSORPTION VOLTAMMETRY OF NICKEL-DIMETHYLGLYOXIME SYSTEM[J]. Chinese Journal of Applied Chemistry, 1985, 2(2): 1-6.
Citation: Jin Wenrui, Jiang Wei. ON THE ADSORPTION VOLTAMMETRY OF NICKEL-DIMETHYLGLYOXIME SYSTEM[J]. Chinese Journal of Applied Chemistry, 1985, 2(2): 1-6.
镍(Ⅱ)-丁二肟体系的吸附伏安法研究
摘要:
本文研究了镍(Ⅱ)-丁二肟体系在悬汞电极上的吸附伏安法。当电极向阴极方向扫描时,吸附在电极上的Ni(Ⅱ)A2分二步不可逆地还原到Ni(O)(Hg)。对非紧密吸附作了理论分析。计算出的线性扫描吸附伏安法的灵敏度为10-9-10-10M与文献报导的实验值一致。
English
ON THE ADSORPTION VOLTAMMETRY OF NICKEL-DIMETHYLGLYOXIME SYSTEM
Abstract:
The adsorption characteristics of the nickel complex with dimethylglyoxime (DMG) Ni (Ⅱ)A2 at the HMDE has been investigated It was found that between-0.20 and -0.90V (vs. SCE) Ni (Ⅱ)A2 can be adsorbed fairly well at the HMDE and the relationship observed by voltammetry with linearly changing tension between the logarithm of the peak current and the logarithm of the sweep velocity is linear and has a slope of 0.98. Experimental peak currents show a Langmuir isotherm with the preconcentration time. The overall reaction of the adsorption voltammetry of nickel-DMG system, which can be divided into three parts, has been discussed. That is 1) Homogeneous reaction between different nickel species in solution, 2) Adsorption preconcentration process of Ni(Ⅱ)A2, 3) Reduction of adsorbed Ni(Ⅱ)A2, by irreversible charge transfer. The sensitivity of the method appears between 10-9M and 10-10M depending on the preconcentration time.
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