Separate sorption-spectroscopic determination of Pb(II), Mn(II), Co(II), Ni(II), Cd(II), Cu(II), Zn(II) in their mixture using the reagent indicator paper
Abstract
The method of colorimetry in combination with appropriate chemometric algorithms have been used for the separate determination of metal ions Pb2+, Mn2+, Co2+, Ni2+, Cd2+, Cu2+, Zn2+. The reagent indicator paper RIP-Metal-Test was used. The values of the separation factor were obtained by the colorimetry method combined with the diffuse reflectance spectroscopy. This has allowed to foresee the possibility of a two-component analysis with the use of a solid-phase reagent. It has been shown that the method of separate colorimetric determination of the two metals with the use the reagent test-paper does not provide the expected results, i.e. it is not universal. The methods of multiple linear regression (MLR) and projection to latent structures (PLS) were applied to obtain total reflection spectra of six metal-formazan complexes immobilized on the indicator paper. The content of each of six metals in unseparated mixtures could not be estimated using neither the MLR method nor PLS method. Grouping of the metals into pairs (Cu2++Zn2+, Cо2++Ni2+ and Pb2++Mn2+) allowed to determine the content of each pair in model mixtures and in the real objects using the PLS with a relative error less than 30%.
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