ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Application of non-steroidal anti-inflammatory drugs for palladium determination

Alaa S. Amin, Wafaa S. Hassan, and Gamal H. Ragab

Chemistry Department, Faculty of Science, Benha University, Benha, 13518 Egypt

E-mail: asamin2005@hotmail.com

Abstract: A highly sensitive spectrophotometric method for palladium determination using piroxicam and tenoxicam as new chromogenic reagents has been developed. In the presence of sodium lauryl sulfate (SLS), palladium reacts with piroxicam (PX) or tenoxicam (TX) to form stable yellow orange complexes in an acetate buffer solution of pH 5.0 at 424 nm and 426 nm with molar absorptivity of 7.16 × 10⁴ L mol⁻¹ cm⁻¹ and 1.20 × 10⁵ L mol⁻¹ cm⁻¹, respectively. Sandell sensitivity, detection, and quantitation limits were also calculated. Optimum conditions were evaluated considering pH, reagent concentration, time, temperature, and surfactant concentration. The complex system conforms to Beer’s law over the range of 0.07–1.28 μg mL⁻¹ palladium. The stoichiometric ratio and stability constant were also evaluated. Tolerance limits of many cations and anions were determined. Finally, the proposed method was applied successfully in the determination of palladium in jewellery, anode mud, synthetic mixtures, catalysts, and alloy samples.

Keywords: palladium complexes - spectrophotometry - industrial analysis - non-steroidal antiinflammatory compounds

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-010-0056-0

Chemical Papers 64 (6) 715–722 (2010)