痕量铜在8-羟基喹啉碳糊化学修饰电极上催化溶出伏安法的研究

Studies on Catalytic Stripping Voltammetry of Trace Amount of Copper (Ⅱ) at an Electrode Chemically Modified with Oxine-Containing Carbon Paste

我们研究铜在8-羟基喹啉(HOX)碳糊化学修饰电极上的阴极溶出伏安特性时,发现铜与HOX生成的配合物在电极上可还原为低价铜的HOX配合物,后者可催化氢在该电极上的放电,产生一灵敏的催化氢波,由于该波是在化学修饰电极基础上得到的,因而具有良好的选择性与灵敏度,用于人发及血中铜的测定,效果较好,初步探讨了催化氢波的反应机理。

The oxine modified electrode was prepared on the basis of carbon paste and the process is rapid and simple. The catalytic stripping voltammetric characteristic of Cu(Ⅱ) on the modified electrode is studied and the method has been appiled to the determination of trace Cu ( Ⅱ) , and there is a good linear relationship between the concentration of Cu(Ⅱ ) and peak height in the range of 1. 5 xxxxxxxxxxxx×r and blood with satisfactory results. Moreover, the reaction mechanism of the modified electrode is discussed and it is considered that the improvement of sensitivity and selection of the modified electrode is dependent on the complexing-absorbing property of electrode surface and a sensitive catalytic hydrogen wave produced.