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Open Chemistry

formerly Central European Journal of Chemistry


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Volume 7, Issue 3

Issues

Volume 13 (2015)

Simultaneous kinetic spectrophotometric determination of Cu(II), Co(II) and Ni(II) using partial least squares (PLS) regression

Morteza Bahram / Khalil Farhadi / Abbas Afkhami / Donya Shokatynia / Farzin Arjmand
Published Online: 2009-06-21 | DOI: https://doi.org/10.2478/s11532-009-0030-2

Abstract

A partial least squares (PLS-1) calibration model based on kinetic—spectrophotometric measurement, for the simultaneous determination of Cu(II), Ni(II) and Co(II) ions is described. The method was based on the difference in the rate of the reaction between Co(II), Ni(II) and Cu(II) ions with 1-(2-pyridylazo)2-naphthol in a pH 5.8 buffer solution and in micellar media at 25°C. The absorption kinetic profiles of the solutions were monitored by measuring the absorbance at 570 nm at 2 s intervals during the time range of 0–10 min after initiation of the reaction. The experimental calibration matrix for the partial least squares (PLS-1) model was designed with 30 samples. The cross-validation method was used for selecting the number of factors. The results showed that simultaneous determination could be performed in the range 0.1-2 μg mL−1 for each cation. The proposed method was successfully applied to the simultaneous determination of Cu(II), Ni(II) and Co(II) ions in water and in synthetic alloy samples.

Keywords: Partial least squares; Simultaneous kinetic determination; Cu(II); Co(II); Ni(II)

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About the article

Published Online: 2009-06-21

Published in Print: 2009-09-01


Citation Information: Open Chemistry, Volume 7, Issue 3, Pages 375–381, ISSN (Online) 2391-5420, DOI: https://doi.org/10.2478/s11532-009-0030-2.

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© 2009 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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