Abstract：The composition of copper anode slime is affected by various factors such as the parameters of the electrolysis process, the quality of the anode plate, and field control. The type and content of elements are complex and variable. During the determination of bismuth in complex copper anode slime samples with high content of lead and barium by EDTA titration method, the insoluble agglomerates usually occurs in sample dissolution process, which will easily cause covering of bismuth, leading to large errors and poor stability of the measurement results. The sample was dissolved with aqua regia and sulfuric acid. The content of bismuth was determined by EDTA titration method in nitric acid medium. The results showed that the determination end-point was sharp under the following experimental conditions: the sample weight was 0.2-1.0g, and the mass concentration of bismuth in solution was higher than 140mg/L; nitric acid and tartaric acid mixture were used as leaching acid; the pH value of solution was adjusted to 1.5-1.7; the content of bismuth was determined using 1.060×10-2 mol/L EDTA standard titration solution. The content of bismuth in actual copper anode slime sample was determined according to the experimental method. The relative standard deviations (RSD, n=9) of the measurement results were between 0.86% and 1.5%, and the recoveries were between 98% and 101%. The proposed method effectively solved the problem that the content of bismuth in complex copper anode slime was difficult to be accurately measured. It was suitable for the analysis of complex copper anode slime samples with bismuth content in range of 1%-12% (mass fraction).
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