马来酰肼的示波极谱法测定

Oscillopolarographic Determination of Maleic Hydrazide

在0.2mol/L LiCl 底液中,用示波极谱法一次导数或二次导数测定马来酰肼,产生一个清晰的阴极波。峰电位为-1.95伏(Vs SCE)。当马来酰肼浓度为1.0×10^(-4)～2.0×10^(-5)mol/L 和1.0×10^(-5)～4.0×10^(-6)mol/L 时(PH5.6～9.3),均与峰电流呈良好的线性关系。检出限量为2.0×10^(-6)mol/L。各种方法间的误差,其相对偏差小于0.3%。作者认为,本研究为测定马来酰肼的纯度提供了一种简单、快速、准确的分析方法。

In the supporting electrolyte of 0.2mol/L LiCl, a distinct cathodic wave was produced by using first or seeondary derivative oscillopolarography to measure maleic hydrazide.The peak potential was -1.95V (Vs.SCE).The peak current was linearly proportional to the concentration of maleic hydrazide in the range of 1.0×10^(-4)mol/L to 2.0×10^(-5)mol/L and 1.5×10^(-5)mol/L to 4.0×10^(-6)mol/L.(PH5.6～9.3).The detection limit was lower than 2.0 ×10^(-6)mol/L.The error of various methods(relative deviation)was less than 0.3 per cent. Therefore,a simple,rapid and accurate analytical method for determining the purity of maleic hydrazide has been afforded in this paper.