Fabrication and application of voltammetric electrodes for determination of platinum in aqueous medium from artificial samples of its precursors

Department of Chemistry, University of Science and Technology, Bannu 28100, Khyber Pakhtunkhwa, Pakistan E-mail : afzalnm@yahoo.com School of Chemistry, Monash University, Clayton Campus, Melbourne, VIC 3800, Australia National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Sindh, Pakistan Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan Deanship of Scientific Research, College of Engineering, PO Box 800, King Saud University, Riyadh 11421, Saudi Arabia Manuscript received online 09 July 2014, revised 03 September 2014, accepted 14 October 2014 Electrochemical methods differential pulse anodic stripping voltammetry (DPASV) and cyclic voltammetry (CV) were applied to determine the concentration of platinum ions in aqueous solutions. Different working electrodes were used in combination with platinum as an auxiliary and standard calomel as a reference electrode. Various parameters such as pH, buffer system, time of deposition, N2 purging and potential scan ranges were optimized to get improved results. Modification of electrode surface and fabrication of past electrodes overcome the problems of adsorption and pre-concentration of metal ions at the surface of the electrode. The developed method was successfully applied to artificial samples of ores and rocks. The low detection limit (LDL) 1.4 × 10–04 µg/ml and linear regression coefficient 0.9906 were noticed for a concentration range 0.001–2 µg/ml of platinum