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在含有1.2M NaCl及0.07M的NaHCO_3缓冲溶液中(pH=7左右)Ge(Ⅳ)产生波形良好的不可逆波,半波电位在26.5℃时为—1.42V(vs.S.C.E.),pH由7.25改变至8.40波高不变,E_(1/2)变动也较小,pH>9波形交斜,波高降低。NaCl浓度由1.0M改变至1.4M波高基本上不变,NaCl浓度在1.6M以上时,波高显著地升高。这个波可用作锗的极谱测定,浓度范围10γ/10ml至5000γ/10ml.Sn(Ⅳ),Sb(Ⅲ)干扰Ge(Ⅳ)的测定,如果它们存在时,要用CCl_4萃取法使Ge(Ⅳ)和它们分离,As(Ⅲ)的含量为Ge(Ⅳ)量一百倍时不干扰测定,大量砷存在时要用蒸馏法(在30％H_2O,存在下)使Ge(Ⅳ)与As(Ⅲ)分离。
Ge (IV) produces a well-shaped irreversible wave with a half-wave potential of -1.42 V (vs.SCE) at 26.5 ° C and a pH of 7.25 in a buffer solution containing 1.2 M NaCl and 0.07 M NaHCO 3 (pH = 7) Change to 8.40 wave height unchanged, E_ (1/2) change is also small, pH> 9 waveform oblique, wave height decreases. The change of NaCl concentration from 1.0M to 1.4M was basically unchanged. When the NaCl concentration was above 1.6M, the wave height increased significantly. This wave can be used as a polarographic determination of germanium in the concentration range of 10γ / 10ml to 5000γ / 10ml.Sn (Ⅳ) and Sb (Ⅲ) interfered with the determination of Ge (Ⅳ) (Ⅳ) and their separation, As (Ⅲ) content of Ge (Ⅳ) when the amount of one hundred times does not interfere with the determination of arsenic in the presence of a large amount of distillation (30% H_2O in the presence of Ge As (Ⅲ) separation.