Determination of Trace Palladium by Spectrophotometric Method with 4, 5-Dibromophenylfluorone

The color reaction of the reagent DBPF with Pd(Ⅱ) in the presence of SLS was studied. Results show that the new color reagent reacts with Pd(Ⅱ) to form a stable yellow complex(1:4)in the presence of SLS at pH 6.3 of HAc-NaAc buffer. The maximum absorption wavelength and apparent molar absorptivity are 376 nm and 1.06×10⁵ L/(mol·cm) respectively. Beer's law is obeyed in the range of 0～12 μg/10 mL Pd(Ⅱ). The method has been applied to the determination of trace palladium (Ⅱ) in palladium catalyst and mineral samples with satisfactory results.