Flow injection catalytic determination of ruthenium with spectrophotometric detection

A new flow injection catalytic method was described for the determination o f ruthenium(III) based on its catalytic effect on the oxidation of brillian t cresyl blue (BCB) by periodate in acidic media. The reaction was followed spectrophotometrically by measuring the absorbance of the dye at 635 nm. U nder optimum conditions, ruthenium can be determined in the range of 1.0-10 0.0 ng ml(-1) with a relative standard deviation of 1.1% and with a limit o f detection of 0.70 ng ml(-1). The influence of reagent and manifold variab les were studied and optimized. The method was tested for the determination of ruthenium(III) in some synthetic mixtures. (C) 2000 Elsevier Science B. V. All rights reserved.