Determination of polyethylene glycol in acid copper electroplating solution by ultraviolet spectrophotometry using bismuth sub-carbonate as chelating agent
SHI Huijuan, LIU Yao, FAN Xiaowei, DU Pengkang, TANG Yunzhi*
Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China
Abstract：During the determination of polyethylene glycol (PEG) in acid copper electroplating solution by traditional bismuth subnitrate method, the problems of low nonlinearity and poor repeatability of experimental results are caused by high interference of copper ions and acidity, high limit of detection, and easy hydrolysis of the conventional detection reagent. The alkaline reagents such as sodium hydroxide was added for the pretreatment of electroplating solution to eliminate the interference of copper ions and acidity. BiI4- complex could react with protonated PEG ions to form the PEG-BiI4- system, which had characteristic absorption at wavelength of 515 nm. Consequently, a new analysis method of PEG content in acid copper electroplating solution was established. The absorbance and turbid degree of testing electroplating solution were selected as the index in experiments. The L9(34) orthogonal experiments were conducted on basis of single-factor experiment, namely, the dosage of bismuth sub-carbonate, the dosage of glacial acetic acid, the dosage of potassium iodide and the ultrasonic time were used as four factors. The optimum formula of coloring reagent was screened out as follows: 0.6 g of bismuth sub-carbonate, 19 mL of glacial acetic acid, 10 mL of potassium iodide (2.4 mol/L) and 50 min of ultrasonic time. Then the calibration curve was established based on Lambert-Beers law using 515 nm as the wavelength of incident light. The results indicated that the content of PEG in range of 1-30 mg/L was linear to the absorbance. The linear regression equation was y=0.014 6 x+0.042 9 with correlation coefficient of 0.996 5; the apparent molar absorptivity was 9.81×104 L·mol-1·cm-1. The proposed method was applied for the determination of PEG in acid copper electroplating solution. The relative standard deviations (RSD, n=7) of determination results were between 0.43% and 0.51%, and the recoveries were between 98% and 101%.
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SHI Huijuan, LIU Yao, FAN Xiaowei, DU Pengkang, TANG Yunzhi. Determination of polyethylene glycol in acid copper electroplating solution by ultraviolet spectrophotometry using bismuth sub-carbonate as chelating agent. , 2021, 41(2): 66-71.
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