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使用阳极溶出催化极谱法测定某些元素已成为可能,但在测定金的方面尚未见报导。采用溶出催化极谱法通常可使峰电流提高数十倍到数百倍,因而能大大提高测定灵敏度。在普通极谱仪上测不出的溶出电流,经催化后,可以明显地观察到溶出催化电流。金的溶出催化原理是:三价金在一定条件下经阴极极化以元素态被电解沉积在玻璃碳电极表面上,之后在含有氯化亚锡的催化体系中进行阳极溶出,被电氧化下的金离子又很快被氯化亚锡还原成为元素态金,并在电极上再被电氧化,如此反复,使有限的金能循环使用,从而提高了峰电流(见图1)。
It has been possible to determine certain elements using anodic dissolution catalytic polarography, but no reports have been reported on the determination of gold. The use of dissolution catalysis polarography usually can make the peak current increased tens to hundreds of times, which can greatly improve the measurement sensitivity. Dissolution current undetectable on a conventional polarograph, after catalysis, clearly observes the dissolution catalytic current. Gold dissolution catalytic principle is: trivalent gold under certain conditions by cathodic polarization to the elemental state is electrolytically deposited on the surface of the glassy carbon electrode, followed by anodic stripping in a catalytic system containing stannous chloride, was electro-oxidation The gold ions were quickly reduced to stannic chloride by elemental gold and electrochemically oxidized again at the electrode. This repeated cycles allowed the limited use of gold, thereby increasing the peak current (see Figure 1).