DBC-偶氮氯膦与锶的极谱配合吸附波的研究与应用

A Study on and Application of the Polarographic Complex Adsorption Wave of DBC-Chlorophosphonazo with Strontium

在0.1mol/L NaOH-0.2mol/L H_3BO_3介质中,DBC-偶氮氯膦在-1.22V和-1.30V(vs.SCE)处有两个导数波。加入锶后,-1.22V处的波高不变,-1.30V处的波明显增高。在最佳条件下,锶的最低检测限为2.30×10^(-9)mol/L。本文讨论了极谱波的电化学反应机理,确定了Sr-DBC-偶氮氯膦配合物的组成为1∶2。拟定了锶的测定方法,并用于矿石中锶的分析。

In a solution of 0.1mol/L NaOH and 0.2mol/L H_3BO_3, DBC-Chlorophosphonazo gives two reduction peaks at-1.22V(vs.SCE) and-1.30V on a singlesweep polarograph. The addition of Sr to the solution does not affect the peak height at-1.22V, but raises the peak height at-1.30V, and the increase in peak height at -1.30V is proportional to the concentration of Sr added. The detection limit of strontium is 2.30×10^(-9)mol/L. The method has been used to determine trace strontium in rocks. The mechanism of the complex adsorption wave has also been discussed. The ratio of strontium to DBC-chlorophosphonazo in the complex has been determined to be 1:2.