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Trace metal determinations by spectrophotometry with a double chromogenic system and a chemometric approach

Authors
  • Ni, Yongnian
Type
Published Article
Journal
Analytica Chimica Acta
Publisher
Elsevier
Publication Date
Jan 01, 1993
Volume
284
Issue
1
Pages
199–205
Identifiers
DOI: 10.1016/0003-2670(93)80025-G
Source
Elsevier
Keywords
License
Unknown

Abstract

A procedure for the simultaneous spectrophotometric quantitative analysis of multi-component systems was developed. A chemical approach with two parallel chromogenic spectrophotometric systems was used to obtain more information, and multivariate calibration techniques, classical least-squares, principal component regression and partial least-squares regression were applied to the processing of absorbance data. As an example, the simultaneous determination of cobalt, nickel, copper, zinc and iron with a double system 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol and 4-(2-pyridylazo_resorcinol as chromogenic reagents by using multivariate calibration methods is described. The predicted results show that the methods with a double system and multivariate calibration methods based on factor analysis are more precise than those with a single system and the classical least-squares method.

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