Determination of Copper in Metal Processing Wastewater by Stripping Voltammetry

Abstract

In this paper, the trace copper in metal processing wastewater was determined by stripping voltammetry, and the influence of instrument condition on the analysis was discussed. The standard working curve was established and the wastewater samples were determined. The results showed that the optimized conditions of instrument determination were as follows: electrolysis initial voltage was -1.3V, electrolysis time was1 minute, balance time was 10 S, the rate of stirring was high speed and scanning speed was 0.08 V/S. Under the above experimental conditions, the peak shape was good, the peak current was large and the peak potential was stable at -0.1V. The linear equation of standard working curve was y = 0.1683X + 0.0121, the standard deviation was R2 = 0.9974, the detection limit was 0.2μg / mL, the recoveries of the wastewater samples were 96.6% -100.5%. The method has the advantages of good accuracy, high precision and high sensitivity, and is suitable for the determination of copper in metal processing wastewater.