Kinetic Spectrophotometric Method for the Determination of Ir(III) in Microgram on the Oxidation of Alanine by HCF(III) in Aqueous Alkaline Medium

This chapter primarily focuses on kinetic spectrophotometric method for the determination of Ir(III) in microgram on the oxidation of alanine by HCF(III) in aqueous alkaline medium. Iridium which is an important member of platinum group metals used as an effective catalyst. In this method Beer’s law is obeyed in the range of 2.99 to 19.98 µg cm-3 of Ir(III). The molar absorptivity & sandell’s sensitivity are found 1.0 x 103 to 1.3 X 103 l mol-1 cm-1 and 0.145 to 0.192 µgcm-2 respectively. The value of correlation coefficient lies between 0.999 to 0.985. The effect of few interfering ions have been worked out for developing the calibration curves in terms of absorbance or reaction rate or pseudo first order rate constant vs. Ir(III) plot, absorbance was noted at λmax of 420 nm. The results show that the present method is more simple and sensitive than the reported methods and especially useful in absence of the expected interfering ions. The standard deviations estimated from six independent determinations in sample of Ir(III) are 0.0588 to 0.115. The comparison of the present method with the earlier reported methods reveals that the present method is relatively simple, inexpensive and sensitive which require low reagent concentration and can be used at room temperature without heating, in aqueous alkaline medium.