Determination of trace bismuth in copper alloy by flow injection on-line ion exchange combined with hydride generation-atomic fluorescence spectrometry

A method for determination of trace bismuth in copper alloy by flow injection system of on-line ion exchange combined with hydride generation-atomic fluorescence spectrometry was established.In the medium of 1 mol/L hydrochloric acid,Bi3+ reacts with Cl-to form a stable anion complex which was adsorbed on the column of strongly basic anion exchange resin 717.The anion complex is desorbed from the column with the mixture of 0.75 mol/L HNO3 and 0.05 mol/L citric acid and then determined by atomic fluorescence spectrometry.The manifold and operating program for on-line ion exchange and hydride generation were designed,and chemical conditions and operation parameters were optimized.The detection limit of the method was 0.04 ng/mL and the calibration curve was rectilinear over 0.04～50 ng/mL Bi3+.The relative standard deviation was 2.02 %(n=11) for determination of 5 ng/mL Bi3+ in the standard solution.Interferences from matrix copper and other concomitant elements were eliminated effectively.The proposed method has been applied to the determination of trace bismuth in standard copper alloy,and experimental results are in agreement with the certified values.