s Spectrophotometric Determination of Ir(III) with Leucine in Alkaline Medium

Background: A kinetic spectrophotometric method based on Ir (III) catalyzed the oxidation of leucine by hexacyanoferrate (III) in the aqueous alkaline medium has been developed for 0.99 μgcm-3 to 19.98 μgcm-3 determination of Ir(III). Method: Molar absorptivity (1.0503 to 1.5003 Lmol-1cm-1), Sandell’s sensitivity (0.183 to 0.128 μgcm-3), correlation coefficient (-0.9872 to 0.9957) and effect of selected interferences have been worked out for developing the calibration curves in terms of absorbance or initial rate or pseudo-first-order rate constant vs. Ir(III) plot. Conclusion: The method is simpler, more sensitive with improved detection limits in comparison to other reported methods and is useful in absence of expected interferants.