【摘要】 本文提出了利用阳极溶出催化波测定微量碲的方法。 在氯化钠或溴化钠底液中,把碲电解富集在玻璃碳电极上,然后在含有氯化亚锡、盐酸、硫酸和高氯酸的催化体系中进行溶出催化,获得溶出催化波。文中考察并确定了最佳测定条件。溶出催化电流与碲的浓度在1×10^-7—4×10^-9M范围内有线性关系。最低浓度测定到8×10^-10M。用本方法对天然水和固体样品中的微量碲进行了测定,均得满意结果。更多还原

【Abstract】 A novel method for the determination of trace tellurium by anodic stripping-catalytical wave has been established.The tellurium（Ⅳ） is concentrated by electrolysis on the surface of glassy carbon electrode at -0.7V （vs. SCE） in a base-solution containing 1.2M NaCl or 1MNaBr-0.02M HClO₄. Then, the glassy carbon electrode is moved into another solution containing 0.01M SnCl₂, 0.18M HCl and 1.5M H₂SO₄. Tellurium is stripped when the potential of the working electrode is scanned backward. Since Te（Ⅱ）, which is produced by electrooxidization at about +0.4V, is reduced to elemental form by SnCl₂ in the second base-solution at once, the stripping-catalytic wave with a peak appears. The peak hight is directly proportional to the concentration of Te（Ⅳ） in the range of 1×10^-7 to 4×10^-9M. Having electrolized for 30 min., it is possible to detect 8×10^-10M Te（Ⅳ） with a classical polarograph. The relative standard deviation is ±9.4％ for solid samples containing parts per million Te.更多还原