丙酮酸在悬汞电极上的电化学行为及其与Al髥的相互作用

Pyruvic Acid: Electrochemical Behaviors at Hanging Mercury Drop Electrode and Interaction with Aluminum(Ⅲ)

研究了酸性、中性、碱性范围内丙酮酸在悬汞电极上的电化学行为,对实验条件进行了优化,在最佳条件下丙酮酸的还原峰电流和浓度有良好的线性关系。同时在不同pH值条件下研究了Al髥和丙酮酸的相互作用,结果表明,不同pH值范围内Al髥和丙酮酸的相互作用均为弱作用,弱作用强度为酸性>碱性>中性。这种作用强度的差别可能来自于不同条件下Al髥的存在形态不同。

The electrochemical behaviors of pyruvic acid at the hanging mercury drop electrode were investigated in acidic, neutral and alkaline buffer solutions. Under the optimum experimental conditions, sensitive reduction waves were obtained by differential-pulse vohammetry （DPV） and there were linear relationships between the peak currents ip and the concentration of pyruvic acid. The interaction between AI（Ⅲ） and pyruvic acid at different pH values were also studied. The results show that there are weak complexing interaction between pyruvic acid and AI（Ⅲ）. The strength of the interaction between AI（Ⅲ） and pyruvic acid at different pH values are as follows acidic buffer solution 〉 alkaline buffer solution 〉 neutral buffer solution. The effect of pH values on the type of - AI（Ⅲ） species in solution might be responsible for this result .