一种基于紫外可见光谱的多金属离子浓度检测方法

A UV-Vis analytical method for polymetallic solutions

针对Cu^(2+),Co^(2+),Zn^(2+) 3种金属离子混合溶液的紫外可见分光光度法(UV-Vis)光谱重叠而难以检测的问题,提出了一种基于改进型Monte Carle无信息变量消除(MC-UVE)方法的多金属离子浓度检测方法。在MC-UVE的基础上引入指数衰减函数(EDF),提出了一种改进的MC-UVE方法,并基于该方法对料液的紫外-可见光谱进行波长筛选;然后,利用筛选出的波长建立PLS模型并进行各组分浓度检测计算;最后,分别对基于MC-UVE方法和改进型MC-UVE方法 PLS模型的计算结果进行对比分析。结果表明:改进型MC-UVE方法可筛选出对模型贡献度高的变量,基于该变量选择方法的PLS模型精度高。

A polymetallic analytical method based on an improved Monte Carlo uninformative variable elimination（MC-UVE） was proposed to determine ion concentration by ultraviolet visible（UV-Vis） spectra of Cu（2＋）, Co（2＋） and Zn（2＋） mixture solution. The improved MC-UVE, developed by incorporating exponential attenuation function（EDF）, was applied to selecting wavelength of UV-Vis spectra. And the partial least squares calibration model was built on concentrations of polymetallic components at the selected wavelength. Experimental results showed that the improved MC-UVE could select higher contributing model variables anddevelop more precise PLS model than MC-UVE.