Spectrophotometric simultaneous determination of nickel, cobalt and copper by orthogonal signal correction–partial least squares

Authors

1 Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran

2 Department of Chemistry, Faculty of Science, K. N. Toosi University of Technology, Tehran, Iran

Abstract

A method for the simultaneous spectrophotometric determination of nickel, cobalt and copper based on the
formation of their complexes with 2-(2-Thiazolylazo)-p-Cresol (TAC) in micellar media of Triton X-100 is
proposed. The absorbance spectra were recorded in the range of 500 to 800 nm. The linear concentration
range for nickel, cobalt and copper in solution calibration sets were 0.05–1.80, 0.10–6.41 and 0.10–6.54
μg/ml, respectively. The effects of experimental parameters such as pH, time, concentration of ligand and
surfactant on the sensitivity of method were investigated. The data obtained from the experiments were
processed by the partial least squares (PLS), orthogonal signal correction-partial least squares (OSC-PLS)
and principle component-back propagation artificial neural network (PC-BPANN). A set of synthetic
mixtures of nickel, cobalt and copper was evaluated and the results obtained by each chemometric
approaches were compared with different testing methods. The OSC-PLS method was selected because
afforded better results than the others. The method was satisfactorily applied for determination of nickel,
cobalt and copper in alloy samples. The accuracy was determined using comparing the results to the
reference values and also independent analysis by flame atomic absorption spectrometry.

Keywords


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