SPECTROPHOTOMETRIC DETERMINATION OF PALLADIUM(II) WITH PHENYLFLUORONEIN THE PRESENCE OF HEXADECYLPYRIDINIUM BROMIDE

Phenylfluorone reacts with palladium(II) in the presence of hexadecylp yridinium bromide to form a water-soluble chelate with an absorption m aximum at 630 nm, the absorbance being constant in the pH-range of 9.0 -10.2. At this wavelength Beer's law is obeyed up to 7.25 x 10(-5) mol /L palladium(II). The sensitivity is very high and the molar absorptiv ity is 8.5 x 10(4) L mol-1 cm-1, permitting the determination of palla dium(II) at mug level. The ratio of palladium to phenylfluorone in the complex is 1:1. The method has successfully been applied to the deter mination of palladium in titanium alloys.