Microdetermination of palladium based on formation of ternary complex of palladium with pyrogallol red and cetylpyridinium bromide

A new spectrophotometric method was employed for the determination of microamounts of palladium(II) based on the ternary complex formation with pyrogallol red and cetylpyridinium bromide. A blue green ternary complex, whose molar absorptivities is 22500 mol^?1 cm^?1 at 650 nm, is formed. Composition (PdPGRCP₃) of the ternary complex was established by continuous variation and mole ratio methods. Beer's law range (0.1–8.5 ppm of Pd) and Sandell's sensitivity (0.001 γ/cm²) were evaluated. The conditional stability constant value (logK = 24.35) was determined by Prakash et al. 's method. A detailed study was made for the determination of microamounts of palladium in the presence of platinum metals and several other cations and anions.