Extractive Separation and Spectrophotometric Determination of Traces of Ruthenium from Mixtures Containing Excess Platinum Group Metals

Abstract

A highly selective, sensitive, and rapid method has been developed for the spectrophotometric determination of ruthenium with 5-chloro-2-hydroxythiobenzhydrazide after extraction into molten naphthalene. Ruthenium was determined in the range 1.2–4.5 ppm. The complex was stable for more than 12 h with molar absorptivity of 1.516 × 10⁴ L mol⁻¹ cm⁻¹ and detection limit of 0.0066 ppm. The method was found to be selective for ruthenium in the presence of a large number of diverse ions. Ruthenium was determined in various synthetic mixtures. The method permits the sequential separation and determination of ruthenium, osmium, and platinum from their mixtures.

Keywords:

• 5-Cl-2-OHTBH
• molten naphthalene
• ruthenium
• spectrophotometric determination

Acknowledgments

The author expresses her gratitude to the principal of the college, Dr. Mhaske D. K., for his constant encouragement during the research. The author is thankful to Prof. Chavan M. B. for his able guidance during the work.

Notes

^a Mean of six determinations.