Direct determination of zirconium and chromium by first-derivative spectrophotometry.
The solution properties of zirconium complex with the Schiff's base 2-(2-pyridylmethyl-eneamino)phenol have been studied by zero-order absorption spectrophotometry. The influence of pH, stability of the complexes with time and stability constants were investigated. The use of first-derivative spectrometry eliminates the interference of chromium and enables the simultaneous determination of zirconium and chromium without previous separation. The relative overall standard errors, of five independent simultaneous determinations of zirconium and chromium at the 1.0 mug/ml concentration level, were 2 and 4%, respectively. The proposed method has been successfully applied to the analysis of some real samples of zirconium/chromium bronzes.
Grabarić
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Laboratory of Polymer Engineering and Organic Chemical Technology, Faculty of Chemical Engineering and Technology, University of Zagreb, Zagreb, Croatia.
Lazarević
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Koprivanac
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