Determination of Trace Copper in Duowei Granules by Differential Chronopotentiometric Stripping Analysis.

ObjectiveTo establish a method of the differential of copper in duowei granules.MethodsIn a medium of 0.1 mol/L HCl-5×10^-4 mol/L KNO₃,the detemination of copper by differential chrono-Potentiometric stropping analysis using glassy carbon-SCE-platinum three electrode potentiostat.The pre-electrolysis potential was-0.60V and time was 40s.The stripping peak at about-0.07V.ResultsThe method was suitable for deter mination of 8~200μg/L(r=0.9964)of copper and the average recovery was 100.1% (RSD=4.1%).ConclusionsThe method not used mercury electrod and no polluted.The method has beed applied examination of trace copper in duowei granules with satisfactory results.