Automated Photometric Determination of Palladium Using the Optrode

Palladium is a chemical element with symbol Pd and atomic number 46. Over half of the supply of palladium and its congener platinum goes into catalytic converters, which convert up to 90% of harmful gases from auto exhaust into less-harmful substances. Palladium is also used in applications such as electronics, medicine, and jewelry. Palladium is determined at pH 4 to 5 by back-titration with zinc sulfate. To visualize the endpoint xylenol orange is used as indicator and the equivalence point is detected with the Optrode at a wavelength of 610 nm.