阳极溶出方波伏安法测定水体中的铜离子

摘要

建立了阳极溶出方波伏安法测定水体中的铜离子的方法。在浓度为0.15 mol／L， pH＝5.0的NH4 Cl溶液中，于－0.11 V（ vs.SCE）产生Cu2＋的灵敏峰，其峰高与离子浓度在0.02～2.0 mg／L范围内，呈良好的线性关系，相关系数R2＝0.9992，线性方程为Y＝60.2785X＋0.1030，在Cu2＋本底值为0.0208 mg／L水体中添加3个水平（0.02、0.04、0.10 mg／L）平均回收率在89.3％～106.5％之间，相对标准偏差（RSDs）为3.2％～9.1％（n＝6），检出限（LOD）为0.005 mg／L。本方法操作简便迅速，灵敏度高，重现性好，能够满足水体中检测铜离子要求。%A method for determination of the copper ion content of the water by square wave anodic stripping voltammeter was established.In solution of 0.15 mol/L NH4 Cl at pH=5 , sensitive stripping peak of Cu (Ⅱ) was observed.The peak potential of the wave was-0.11 V ( vs.SCE) .Measured within the range of 0.02~2.0 mg/L, the mass concentration of Cu (Ⅱ) and peak height showed a good linear relationship ( R2≥0.9992 ) , linear regression equation was Y=60.2785X+0.1030.The average recovery rates were 89.3%~106.5%, and relative standard deviation (RSDs) were 3.2%~9.1%( n=6), at the spiked level 0.02, 0.04, 0.10 mg/L, in water with Cu (Ⅱ) content 0.0208 mg/L.Limit of qualitative of the method( LOD) was 0.005 mg/L.Results showed that the method was convenient operation, high sensitivity, good reproducibility, could meet determination of Cu(Ⅱ) content in water.