Solid-phase extraction and simultaneous spectrophotometric determination of trace amounts of Co, Ni and Cu using partial least squares regression

Leila Hejazi, Diako E. Mohammadi, Yadollah Yamini, Richard G. Brereton

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

A novel sensitive and simple method for rapid extraction, preconcentration and determination of cobalt, nickel and copper as their 1-(2-pyridilazo)-2- naphthol (PAN) complexes using polytetrafluoroethylene filter as solid phase and multivariate calibration of spectrophotometric data is presented. The analytical wavelengths of 400-700nm were chosen and the experimental calibration matrix for partial least squares (PLS) was designed with 21 samples of 5.90-41.25, 0.30-29.35 and 0.64-41.30ngml-1 for cobalt, nickel and copper, respectively. The cross-validation method was used for selecting the number of components. The root-mean-square errors of predictions (RMSEPs) were between 0.48 and 1.37ngml-1. In this work we could reach preconcentration factors of 100 or even higher by using polytetrafluoroethylene as solid phase which is cheap and can be used in a wide range of pH, flow rates and for many times. The proposed method was successfully applied to the simultaneous determination of Co, Ni and Cu in tap and pit water samples.

Original languageEnglish (US)
Pages (from-to)183-189
Number of pages7
JournalTalanta
Volume62
Issue number1
DOIs
StatePublished - Jan 9 2004

Keywords

  • Multivariate calibration
  • PAN
  • Solid phase extraction
  • Spectrophotometry

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