高浓度锌离子背景下检测痕量镍离子的扩展卡尔曼滤波优选方法  

Extended Kalman Filter Optimum Method for Determination of Trace Nickel Ion in High Concentrated Zinc Solution

作　　者：周风波 李勇刚[2] 朱红求[2] ZHOU Feng-Bo;LI Yong-Gang;ZHU Hong-Qiu(School of Physics and Electronics,Central South University,Changsha 410083,China;School of Information Science and Engineering,Central South University,Changsha 410083,China;School of Information Engineering,Shaoyang University,Shaoyang 422000,China)

机构地区：[1]中南大学物理与电子学院,长沙410083 [2]中南大学信息科学与工程学院,长沙410083 [3]邵阳学院信息工程学院,邵阳422000

出　　处：《分析化学》2019年第8期1243-1248,共6页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(Nos.61533021,61621062)资助~~

摘　　要：在锌湿法冶金的净化过程中,锌离子(Zn 2+)与痕量镍离子(Ni 2+)的浓度比高达10 5,且Zn 2+与Ni 2+谱峰重叠严重,使得Ni 2+信号被高浓度锌信号完全掩蔽,导致Ni 2+的灵敏度较低,以及Ni 2+的吸光度和浓度呈现出很强的非线性关系。针对高锌溶液中Ni 2+浓度难以检测的问题,本研究提出了一种基于紫外-可见吸收光谱在高锌背景下检测Ni 2+的扩展卡尔曼滤波(EKF)波长优选的方法。首先制备Ni 2+标准溶液,建立Ni 2+的非线性模型,获取吸光系数矩阵;然后通过设置相关系数阈值方法选择滤波区间,最后通过扩展卡尔曼滤波分光光度法检测Ni 2+浓度。Ni 2+浓度的检测范围为0.3~6.0 mg/L,预测均方根误差(RMSEP)为0.145,平均相对偏差为3.86%。本方法快速、简单,适用于锌湿法冶金净化过程中Ni 2+的实时检测和控制。In the purification process of zinc hydrometallurgy,the concentration ratio of zinc to trace nickel ion may reach up to as high as 10 5,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.

关 键 词：紫外-可见吸收光谱法 扩展卡尔曼滤波 波长选择 锌湿法冶金 镍离子 

分 类 号：O65[理学—分析化学]