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镁离子由于在电极上难还原,故只有在很负的电位处才有还原波。在四甲基铵盐支持电解质中,镁离子约在-2.2V(对SCE)处产生一个不很清淅的波。该波呈现出一个显著的极大,其后扩散电流大得不正常。可见极谱测定镁是很困难的。 Richardson[2]用极谱法测定了碳酸钙中的镁,方法基于镁的索洛铬紫R.S.(Soloch-rome Violet R.S.)络合物在pH>11的哌啶缓冲溶液中的极谱还原。Cheney等报导了在pH=10的四乙基溴化铵溶液中Mg~(2+)的一个极谱催化波。他们认为催化波的形成,与电极过程中生成Mg~+有关。该催化波只有当Mg~(2+0浓度大于2×10~(-5)M之后才出现,故灵敏
Magnesium ions due to difficult to restore the electrode, it is only in a very negative potential reduction wave. In the tetramethylammonium salt supporting electrolyte, magnesium ions produce an undissolved wave at about -2.2 V (vs. SCE). The wave showed a significant maximum, followed by the proliferation of abnormally large current. Visible polarographic determination of magnesium is very difficult. Richardson [2] determined the magnesium in calcium carbonate by polarography, and the method was based on polarographic reduction of the Soloch-rome Violet R.S. complex in piperidine buffer at pH> 11. Cheney et al. Reported a polarographic catalytic wave of Mg ~ (2+) in tetraethylammonium bromide solution at pH = 10. They believe that the formation of catalytic waves, and the formation of electrode Mg ~ + related. The catalytic wave only appears when Mg 2+ concentration is greater than 2 × 10 -5 M