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Direct chromium speciation using X‐ray spectrometry and chemometrics
Author(s) -
de Oliveira L.,
Antunes A. M.,
Bueno M. I. M. S.
Publication year - 2010
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1261
Subject(s) - chromium , chemometrics , genetic algorithm , chemistry , principal component analysis , hexavalent chromium , mass spectrometry , partial least squares regression , analytical chemistry (journal) , environmental chemistry , chromatography , mathematics , statistics , organic chemistry , evolutionary biology , biology
Chromium is a chemical element that occurs in two principal distinct forms: trivalent (Cr(III)) and hexavalent (Cr(VI)). As chromium toxicity depends on its oxidation state, the concentrations of both the species should necessarily be determined, and not only that of total chromium. Using X‐ray spectrometry allied to chemometrics, this work presents a new method for chromium speciation, with no prior separation and/or preconcentration of Cr(III) and Cr(VI) species. Spectra of several solutions containing different concentrations of Cr(III) and Cr(VI) were obtained. The data were treated through principal component analysis and partial least squares regression. The results obtained show that direct speciation using a conventional X‐ray spectrometer is possible, with calculated limits of detection and quantification for Cr(III) and Cr(VI) being lower than 17 and 50 µg g −1 , respectively. Copyright © 2010 John Wiley & Sons, Ltd.