Simultaneous determination of iron, cobalt, nickel and copper by UV-visible spectrophotometry with multivariate calibration

A method for the simultaneous spectrophotometric determination of the divalent ions of iron, cobalt, nickel and copper based on the formation of their complexes with 1,5-bis(di-2-pyridylmethylene) thiocarbonohydrazide (DPTH) is proposed. The resolution of quaternary mixtures of these metallic ions w...

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Bibliographic Details
Published in:Talanta (Oxford) 1998-10, Vol.47 (2), p.463-470
Main Authors: Garcia Rodriguez, A.M, Garcia de Torres, A, Cano Pavon, J.M, Bosch Ojeda, C
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Cobalt
Copper
Determination
Exact sciences and technology
Iron
Multivariate analysis
Nickel
Spectrometric and optical methods
Spectrophotometry
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Summary:A method for the simultaneous spectrophotometric determination of the divalent ions of iron, cobalt, nickel and copper based on the formation of their complexes with 1,5-bis(di-2-pyridylmethylene) thiocarbonohydrazide (DPTH) is proposed. The resolution of quaternary mixtures of these metallic ions was accomplished by several chemometric approaches. A comparative study of the results obtained for simultaneous determinations in mixture by using principal component regression (PCR) and partial least-squares regression (PLS-1 and PLS-2) for absorbance, first-derivative and second-derivative data is presented. In general, the best recovery values are obtained by the PLS-2 method for absorbance data. This procedure allows the simultaneous determination of the cited ions in alloys and biological materials Good reliability of the determination was proved.
ISSN:0039-9140
1873-3573
DOI:10.1016/S0039-9140(98)00157-X