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Use of multivariate curve resolution for determination of chromium in tanning samples using sequential injection analysis

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Abstract

We report a method for determining total chromium in tanning samples using sequential injection analysis (SIA) with a diode-array spectrophotometric detector. With a suitable analytical sequence CrO 2–4 is converted to Cr2O 2–7 inside the tubes of the SIA system, after total oxidation of chromium(III). A data matrix is obtained and analysed by several chemometric techniques based on multivariate analysis: principal components analysis, simple-to-use interactive self-modelling mixture analysis, and multivariate curve resolution-alternating least-squares. We studied several samples from different stages of a tanning process. Two of these samples were easily oxidized but the others needed more extreme conditions. The analytical sequence prepared, which was based on obtaining a pH gradient and used H2SO4 as reagent, is valid and independent of the level of oxidation needed for the sample. We established a calibration model and evaluated the figures of merit. In some samples we found interferents. With this method the amounts of chromium in each sample were quantified and the results were statistically similar to those obtained by use of the reference method, atomic absorption spectrometry.

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Acknowledgements

The authors would like to thank the Spanish Ministry of Education, Culture and Sports (Project BQQ2003-01142) for economic support, the AGAUR, of the Catalan Government, for providing Veronica Gomez with a doctoral fellowship and the Escola d’Adoberia in Igualada (Spain) for supplying the tanning samples.

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Authors and Affiliations

  1. Department of Analytical and Organic Chemistry, Rovira i Virgili University, Marcel·lí Domingo s/n Campus Sescelades, 43007, Tarragona, Spain

    V. Gómez & M. P. Callao

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  1. V. Gómez
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  2. M. P. Callao
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Gómez, V., Callao, M.P. Use of multivariate curve resolution for determination of chromium in tanning samples using sequential injection analysis. Anal Bioanal Chem 382, 328–334 (2005). https://doi.org/10.1007/s00216-005-3121-8

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  • DOI: https://doi.org/10.1007/s00216-005-3121-8

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