Abstract：The copper leaching solution contained a lot of copper ions. The determination of active silicon by silicon molybdenum blue spectrophotometry was severely interfered by the blue color of copper ion. In order to eliminate the interference of copper ion with the determination of silicon, the copper leaching solution was pretreated in experiments by copper separation via electrodeposition. The effect of current density on copper separation was investigated. Moreover, the influence of absorbance in silicon molybdenum blue spectrophotometry at different wavelengths, the addition amount of hydrochloric acid after neutralization of sample and the coexisting elements in sample after copper separation via electrodeposition on the determination of silicon was also studied. The results showed that the optimal current density for copper separation via electrodeposition was 5.0A/dm2. During the determination of active silicon by silicon molybdenum blue spectrophotometry, the optimum measuring wavelength was 640nm. The optimum addition amount of hydrochloric acid (1+9) after neutralization of sample was 6.00mL. The coexisting elements in sample after copper separation via electrodeposition had no obvious interference with the determination of silicon. The Beer′s law was obeyed between absorbance and mass concentration of silicon in range of 0.05-3.00μg/mL. The correlation coefficient of calibration curve was 0.9999, and the detection limit was 0.024μg/mL. The precision tests were conducted using different copper leaching solution samples. The relative standard deviations (RSD, n=12) were between 0.28% and 0.50%. The experimental method was applicable for the determination of silicon in two copper leaching solution samples. The found results were basically consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES).
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