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本文描述了一种基于1,2,4,6-四苯基吡啶四氯金酸盐离子对的涂层金属丝金离子选择电极,在金浓度为10~(-2)-3×10~(-6)M范围内,电极具有良好的能斯特响应(斜率59mv/p Au)。试验了22种离子仅有铊严重干扰。用电极测定Ag-Pd-Au合金中的金,得到了满意的结果。对待测金属离子的带负电荷卤化物和假卤化物络合物为电活性物质的涂层金属丝离子选择电极已有报道,并已用于测定以卤络合物状态存在的铁、铜、汞、锌和铋,及以四硫代氰酸钴(Ⅱ)络合物状态存在的钴。将这些金属的络阴离子与Aliquat 33bs和benzalkonium形成的离子对络合物并入到PVC膜(聚氯乙烯)的涂层金属丝离子选择电极之中。四氯金酸(Ⅲ)与1,2,4,6-四苯基吡啶离子对的形成和萃取最近已有报道。这种离子对具有很高的萃取率和很好的选择性,可作为涂层电极的电活性物质,有关电极的选择性取决于离子对的萃取性能。本文报道了利用该电极选择测定金的方法。
In this paper, a coated gold wire electrode based on 1,2,4,6-tetraphenyl pyridine tetrachloroaurate ion pair is described. When the gold concentration is 10 ~ (-2) -3 × 10 ~ (-6) M, the electrode has a good Nernst response (slope 59mv / p Au). Twenty-two ions were tested for only severe thallium interference. The determination of gold in the Ag-Pd-Au alloy by the electrode gave satisfactory results. Coated wire ion-selective electrodes for negatively charged halides and pseudo-halide complexes of analyte metal ions as electroactive species have been reported and have been used to determine the presence of iron, copper, Mercury, zinc and bismuth, and cobalt present in the cobalt (II) tetrathiocyanate complex. Ion-pair complexes of these metal anions with Aliquat 33bs and benzalkonium were incorporated into the coated wire ion-selective electrode of a PVC membrane (polyvinyl chloride). The formation and extraction of tetrachloroauric acid (Ⅲ) and 1,2,4,6-tetraphenylpyridinium ion pairs have been reported recently. This ion pair has a high extraction rate and good selectivity, which can be used as the electrode active material coating, the selectivity of the electrode depends on the extraction performance of the ion pair. This paper reports the method for the determination of gold using this electrode.