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人們很早就观察到,铟电解只能粗略地或部分地和它的共生金属分离。克萊納脫和特雷依尔証实,在标准电位次序中位于鋅之前的金属不能和铟分离,虽然In~(+3)离子和Zn离子的标准电位相差0.43伏以上。最近作者詳細地研究了铟的电化学行为,并且确定只有一价狀态的铟可以电析出来,In~(+1)离子是非常容易氧化的,其对标准氫电極的氧化还原电位約(?)0.4伏。当陰極区域和陽極区域用隔膜很好地隔开时,金属铟成很好的結晶狀态析出,并且电流效率很高。如于45°下,电解1％濃度的In_2(SO_4)_3溶液(pH=2.44),
It has long been observed that indium electrolysis can only be roughly or partially separated from its intergrowth metal. Kleinatre and Terrell confirmed that the metal that precedes zinc in the standard potential order can not be separated from indium although the standard potentials of In ~ (+3) ions and Zn ions differ by more than 0.43 volts. Recently, the author has studied in detail the electrochemical behavior of indium and has determined that indium in a monovalent state can be electrolytically precipitated. In ~ (+1) ions are very easily oxidized, and their redox potential to a standard hydrogen electrode is about (?) 0.4 volts. When the cathode region and the anode region are well separated by a separator, the metal indium is precipitated in a well-crystallized state and the current efficiency is high. For example, at 1% concentration of In 2 (SO 4) 3 solution (pH = 2.44) at 45 °,