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苏联等提出应用硫脲测定铕,有可能使其检测限降低到1×10~(-6)M。最佳的底液组成是0.1 MKI-1×10~(-3)M 硫脲(pH 4.5),Eu~(3+)在其中形成三元络合物,其组成为 Eu[(NH_2)_2CS]_nI_m。在-0.01—-0.3伏范围内出现良好的极谱峰。Eu 在5×10~(-6)—5×10~(-4)M 浓度范围内对极谱峰
The Soviet Union proposed the use of thiourea for the determination of europium, it is possible to reduce the detection limit to 1 × 10 ~ (-6) M. The optimal composition of the bottom liquid is 0.1 MKI-1 × 10 -3 M thiourea (pH 4.5), in which Eu 3+ forms ternary complexes with Eu [(NH 2) 2CS ] _nI_m. Good polarographic peaks appear in the -0.01--0.3 volt range. Eu in the range of 5 × 10 -6 -6 -5 -5 M concentration of polarographic peaks