Application of multivariate calibration methods for the simultaneous multiwavelength spectrophotometric determination of Fe(II), Cu(II), Zn(II), and Mn(II) in mixtures

Ni, Yongnian, Wang, Yong and Kokot, Serge (2007) Application of multivariate calibration methods for the simultaneous multiwavelength spectrophotometric determination of Fe(II), Cu(II), Zn(II), and Mn(II) in mixtures. Analytical Letters, 40 6: 1209-1226. doi:10.1080/00032710701297174


Author Ni, Yongnian
Wang, Yong
Kokot, Serge
Title Application of multivariate calibration methods for the simultaneous multiwavelength spectrophotometric determination of Fe(II), Cu(II), Zn(II), and Mn(II) in mixtures
Journal name Analytical Letters   Check publisher's open access policy
ISSN 0003-2719
Publication date 2007
Sub-type Article (original research)
DOI 10.1080/00032710701297174
Volume 40
Issue 6
Start page 1209
End page 1226
Total pages 18
Place of publication Philadelphia
Publisher Taylor & Francis Inc
Language eng
Subject 0301 Analytical Chemistry
Abstract A sensitive method for the simultaneous spectrophotometric determination of Fe(II), Cu(II), Zn(II), and Mn(II) in mixtures has been developed with the aid of multivariate calibration methods, such as classical least squares (CLS), principal component regression (PCR) and partial least squares (PLS). The method is based on the spectral differences of the analytes in their complexation reaction with 4-(2-pyridylazo)resorcinol (PAR) and the use of full spectra with wavelengths in the range of 300-600 nm. It was found that both the spectral positive and negative bands obtained against the PAR blank, are proportional to the concentration for each metal complex. The obtained linear calibration concentration ranges are 0.025-0.6, 0.05-0.8, 0.025-0.8, and 0.05-0.8 mu g ml-1 for Fe(II), Cu(II), Zn(II), and Mn(II), respectively, and the LODs for the four metal ions were found to be approximately 1-3 x 10(-2) mu g ml(-1). The proposed method was applied to a verification set of synthetic mixtures of these four metal ions, with models built in three different wavelength ranges, i. e., 300-450, 450-600, and 300-600 nm, corresponding to the positive, negative bands and their combinations, respectively. It was shown that the PLS model for the 300-600 nm range gave the best results (RPET = 6.9% and average recovery similar to 100%; cf. PCR: RPET = 9.5% and average Recovery similar to 110%). This method was also successfully applied for the determination of the four metal ions in pharmaceutical preparations, chicken feedstuff, and water samples.
Keyword Chemistry, Analytical
multivariate calibration
PLS
multiwavelength spectrophotometry
Fe(II)
Cu(II)
Zn(II)
Mn(II)
PAR chromogen
Least-squares Methods
Quantitative Spectral-analysis
Trace-metal Determinations
Solid-phase Extraction
X-ray-fluorescence
Multicomponent Samples
Iron Concentrations
Copper
Zinc
Manganese
Q-Index Code C1

 
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Created: Mon, 18 Feb 2008, 17:19:00 EST