含有吸附络合物溶液的倒数示波计时电位法的应用

Reciprocal Oscillographic Chronopotentiometery of Containing Adsorbable Complexes and Its Application

Ｐｂ（Ⅱ）在０．２％乙二胺－５×１０^（－３）ｍｏｌ·Ｌ^（－１）ＨＯｘ－０．３ｍｏｌ·Ｌ^（－１）ＫＯＨ溶液中，有良好的倒数示波图，其峰电位Ｅｐ＝－１．０５（ｖｓ．ＳＣＥ），峰高与Ｐｂ^（２＋）浓度在４．０×１０^（－７）～２．０×１０^（－５）ｍｏｌ·Ｌ^（－１）范围内成正比，检测下限可达２．０×１０^（－７）ｍｏｌ·Ｌ^（－１）。本实验采用倒数示波计时电位法对铝合金＂Ａ＂中铅进行了测定，并直接通过示波图，对络合物的吸附性进行了验证，获得了满意的结果。

In 2% ethylenediamine-5×10￣(-3)mol/L HO_x-0. 3 mol/L KOH(pH =-13.5) supporting electrolytes, a good oscillogram of pb(Ⅱ)and HO_x is obtained by reciprocaloscillographic chronopotentiometery. The peak potential is-1.05(vs. SCE ). The peak height is directly proportional to the concentration of pb(Ⅱ)in the range of 4.0×10￣(-7)～2.0×10￣(-5)mol/L. The detection limit iS 2.0×10￣(-7)mol/L. The method has been applied to determination of lead in allumniun alloy'A',The characteristics of the polarographic wave was tested and verified by oscillogram.The results are satisfactory.