microgram determination

This chapter presents a technique called kinetic spectrophotometry, used to measure the amount of Ir(III) in micrograms, by oxidizing alanine with HCF(III) in an aqueous alkaline medium. Iridium, which belongs to the platinum group metals, is an important catalyst. Beer’s law is applied in the range of 2.99 to 19.98 µg cm-3 of Ir(III). The molar absorptivity and Sandell’s sensitivity are found to be 1.0 x 103 to 1.3 X 103 L mol-1 cm-1 and 0.145 to 0.192 µgcm-2, respectively. The correlation coefficient value ranges from 0.999 to 0.985. The effect of a few interfering ions has been tested to create calibration curves in terms of absorbance, reaction rate, or pseudo-first-order rate constant vs. Ir(III) plot. Absorbance was noted at a maximum of 420 nm. The results show that this method is simpler and more sensitive than reported methods, especially in the absence of expected interfering ions. The standard deviations estimated from six independent determinations in a sample of Ir(III) are 0.0588 to 0.115. The comparison of this method with earlier reported methods reveals that it is relatively simple, inexpensive, and sensitive, requiring low reagent concentrations and can be used at room temperature without heating in an aqueous alkaline medium.

Author(s) Details:

Shakunj Rajput,
Department of Chemistry, Government Degree College, Bhupatwala, Haridwar (U.K), India.

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