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在示波极谱上,在氯化铵底液中,pH4～7时,Sc~(3+)-铜铁试剂(Cup)-二苯胍(DPG)体系产生一个较大的催化波,在1×lO~(-7)～1×lO(-6)M Sc~(3+)浓度内与波高有线性关系,而在dc极谱上不产生催化波.此波为络合吸附波,络合物在电极上的吸附平衡不能瞬时达到.络合物组成为:Sc~(3+):Cup:DPG:CL~-=1:1:1:2,它具有八面体构型.在实验条件下,条件稳定常数β=1.22×10~7.四元络合离子吸附于电极表面,络合物中的Cup以酸形式在电极上还原,产物为苯肼;释出的Sc~(3+)可以再络合、吸附,产生催化电流.
In the oscillopolarography, a large catalytic wave was produced in the Sc ~ (3 +) - cupric-diphenylguanidine (DPG) system at pH4 ~ 7 in ammonium chloride solution, There is a linear relationship between the concentration and the wave height in the range of 1 × lO ~ (-7) ~ 1 × 10 ~ (-6) M Sc ~ (3+), while no catalytic wave is generated on the dc polarographic spectrum. The adsorption equilibrium of the complex on the electrode can not be reached instantaneously.The complex composition is: Sc ~ (3 +): Cup: DPG: CL ~ - = 1: 1: 1: 2, which has octahedral configuration. Under the experimental conditions, the stability constant β = 1.22 × 10 ~ 7. Quaternary complex ions adsorbed on the electrode surface, the Cup in the complex acid form on the electrode reduction, the product is phenylhydrazine; released Sc ~ ( 3+) can be complexed, adsorbed, to produce catalytic current.