丁二酮肟碳糊化学修饰电极直接电位法测定微量镍的研究

ON DETERMINING MICRO NICKEL BY POTENTIOMETRY OF DIMETHYLGLYOXIME CARBON PASTE CHEMICALLY MODIFIED ELECTRODE

研究了一种以丁二酮肟（Ｃ４Ｈ８Ｎ２Ｏ２，ＤＭＧ）为修饰剂的碳糊化学修饰电极（ＣＭＥ）。该电极在ｐＨ＝８．８的ＮＨ３－ＮＨ４Ｃｌ缓冲溶液中，对Ｎｉ２＋浓度的负对数有线性电位响应。线性范围是５．０×１０－７～１．０×１０－３ｍｏｌ／Ｌ。电极修饰简单、性能稳定，每修饰一次可稳定测试１０个标准系列。对钢铁试样中的微量Ｎｉ进行了测定。

A kind of carbon paste chemically modified electrode using dimethylglyoxime as modified chemical was studied.The electrode gives a linear response of the potential with respect to the logarithm of the Ni 2+ concentration in the range of 5 0×10 -7 ～ 1 0×10 -3 mol/L.The electrode is simple to prepare,easy to reproduce,and very stable.Determination of micro nickel in steel with this electrode gave satisfactory results.