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 Cu2+
Co2+ and Zn2+ 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 and develop more precise PLS model than MC-UVE.