Citation:
ZHOU Feng-Bo, LI Yong-Gang, ZHU Hong-Qiu. Extended Kalman Filter Optimum Method for Determination of Trace Nickel Ion in High Concentrated Zinc Solution[J]. Chinese Journal of Analytical Chemistry,
;2019, 47(8): 1243-1248.
doi:
10.19756/j.issn.0253-3820.191020
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In the purification process of zinc hydrometallurgy, the concentration ratio of zinc to trace nickel ion may reach up to as high as 105, and the overlap peaks of zinc and nickel ions are serious, so that the signal of nickel ion is completely masked by the signal of high concentrated zinc ion, resulting in low sensitivity in detection of nickel ion, and the absorbance and concentration of nickel ion exhibit a strong nonlinear relationship. In this work, aiming at the issue of difficult detection of nickel ion in high concentrated zinc ion solution, an extended Kalman filter (EKF) optimum method based on UV-vis spectrometry for determination of trace nickel in high concentrated zinc ion solution was proposed. Firstly, the standard solution of nickel was prepared, and the nonlinear model of nickel ion was established to obtain the absorption coefficient matrix. Then the filter interval was selected by setting the threshold of correlation coefficient. Finally, the concentration of nickel ion was detected by EKF method. The detection range of nickel ion was 0.3-6.0 mg/L, the RMSEP of nickel was 0.145, and the average relative deviation was 3.9%. The results showed that the method was fast, easy to operate and suitable for real-time detection and control of nickel ion quanlification in the purification process of zinc hydrometallurgy.
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