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Investigation of copper(II)‐Ethylenediaminetetraacetate complexation by window factor analysis of ultraviolet spectra
Author(s) -
Den Wei,
Malinowski Edmund R.
Publication year - 1993
Publication title -
journal of chemometrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.47
H-Index - 92
eISSN - 1099-128X
pISSN - 0886-9383
DOI - 10.1002/cem.1180070203
Subject(s) - titration , chemistry , stoichiometry , copper , ultraviolet , aqueous solution , salt (chemistry) , component (thermodynamics) , analytical chemistry (journal) , kinetics , spectral line , biological system , chromatography , inorganic chemistry , thermodynamics , materials science , organic chemistry , physics , optoelectronics , quantum mechanics , biology , astronomy
Window factor analysis (WFA) is a self‐modeling chemometric technique for obtaining the concentration profiles of components from evolutionary processes such as chromotography, titration and reaction kinetics. By specifying the ‘window’, i.e. the region along the evolutionary axis indigenous to a component, the concentration profile of the component can be obtained without recourse to any information concerning the other components. Mathematical expressions required to perform such computations are derived. The method is applied to the investigation of copper(II) complexation with ethylenediaminetetraacetate (EDTA) by recording and factor analyzing the ultraviolet spectra of aqueous solutions containing a fixed amount of the disodium salt of EDTA and varying amounts of CuCl 2 . Evidence for four different species of EDTA is obtained. Clues concerning the stoichiometry of the species are garnered from the concentration profiles.