二次微分简易示波伏安法测定痕量镍

Determination of Trace Nickel by Second-order Differential Simple Oscillographic Voltammetry

用二次微分简易示波伏安法测定了金刚石酸洗废液中的痕量镍 .结果表明 :在 0 .2 0mol/ L NH4 Ac- 0 .0 0 5mol/ L KNO3- 0 .0 2 %丁二酮肟中 ,Ni2 +浓度在 3× 10 -7～ 3.5× 10 -6mol/ L范围内与峰高呈线性关系 ,回归方程为 Y=0 .3583+1.365× 10 5c( Ni2 +) ( mol/ L) ,相关系数 r=0 .9970 ,检测下限为 6× 10 -8mol/ L.该法简单、快速。

Trace nickel in waste solution from process of diamond cleaning by acid is determined by second order differential simple oscillographic voltammetry. The results show that in 0 20 mol/L NH 4Ac 0 005 mol/L KNO 3 0 02% diacetyldioxime solution the peak height of the oscillogram depends linearly on the concentration of Ni 2+ ranged from 3×10 -7 to 3 5×10 -6 mol/L. The regressive equation is Y =0 3583+1 365×10 5 c (Ni 2+ ) (mol/L) . r = 0 9970. The detection limit is 6×10 -8 mol/L. The method is simple, rapid and sensitive.