Simultaneous spectrophotometric determination of Cu(II), Co(II), Ni(II) using 1-(2-pyridylazo)-2-naphthol (PAN) by chemometric method
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In addition, PAN was a colored reagent and absorption at a wavelength near to the wavelength of maximum absorbance of PAN complexes with metal ions lead to the mutual overlap between the reagent and the complex spectrum.
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