Recent Trends in Kinetics in Analytical Chemistry and Kinetic Method for Determination of Ruthenium (III) Using Aniline Blue-Acidic Chlorite Reaction

Abstract

Recent trends in the kinetic rate methods in the past three decades have been concisely reviewed to show the magnanimity of the work and scope of applications in analytical chemistry. Furthermore, based on the highly selective catalytic efficiency of Ru(III) on the oxidation of aniline blue (AB⁺) by acidic chlorite, a fixed-time analytical procedure is described for determination of ultratrace amounts of Ru(III). The attainable lower detection limit is 2.5 ng/ml. The proposed method allows Ru(III) determination with no interference from a wide range of cations, changes in pH, and ionic strength, which is tested with a number of synthetic mixtures.

Keywords:

• Aniline blue
• Chlorite
• Determination
• Kinetic-catalytic method
• Ru(III)

Acknowledgments

This paper is part of a Special Issue of Analytical Letters focusing on papers presented at the 10th International Symposium on Kinetics in Analytical Chemistry (KAC-10).

Key note talk delivered at “10th Kinetics in Analytical Chemistry” symposium in December 2009 at Cape Town, South Africa.

Authors acknowledge the financial support received from the University of KwaZulu-Natal, Durban and the National Research Foundation of South Africa.

Notes

*Mean of duplicate experiments with less than 3% deviation (For k, all the ln Abs. vs. time plots had R² values ≥0.99 and zero time intercepts were the same).

# Initial rate = (Abs. at 60 s – Abs. at 120 s)/ 60 s.

*Maximum ratio tested and one cation at a time. **With no masking agent.

*With 1.0 × 10⁻⁴ M Na₂H₂P₂O₇ as a masking agent for Fe(III).

^@Mean of triplicate experiments with standard deviation less than 3%.

^#Tap water spiked with cations.