运用阴极溶出伏安法,在二乙胺和氢氧化钠支持电解质中使硫获得较高的灵敏度。当富集5分钟后,其测定下限可达3.1×10~(-9)mol L。常见元素无干扰,但是铜(Ⅱ)、铅(Ⅱ)、锌、镉等将抑制峰高,硫脲与硫峰电位相同而严重干扰。文中还讨论了S~(2-)的电化学和化学反应机理。 Cathodic stripping voltammetry is used to obtain higher sensitivity to sulfur in diethylamine and sodium hydroxide supported electrolytes. When the enrichment for 5 minutes, the lower limit of determination of up to 3.1 × 10 ~ (-9) mol L. Common elements without interference, but copper (Ⅱ), lead (Ⅱ), zinc, cadmium will inhibit the peak height, thiourea and sulfur peak potential and the same serious interference. The electrochemical and chemical reaction mechanism of S ~ (2-) is also discussed.