DIRECT DETERMINATION OF ZIRCONIUM AND CHROMIUM BY FIRST-DERIVATIVE SPECTROPHOTOMETRY

The solution properties of zirconium complex with the Schiff's base 2( 2-pyridylmethyleneamino)phenol have been studied by zero-order absorpt ion 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 e nables the simultaneous determination of zirconium and chromium withou t previous separation. The relative overall standard errors, of five i ndependent simultaneous determinations of zirconium and chromium at th e 1.0 mu g/ml concentration level, were 2 and 4%, respectively. The pr oposed method has been successfully applied to the analysis of some re al samples of zirconium/chromium bronzes.