Spectrophtometric Determination of the Platinum Metals. Determination of Palladium with Eriochromcyanine R in the Presence of Cetylfyridinium Bromide

Abstract

Abstract A new photometric method has been developed for the determination of microgram amounts of id(II) on the basis of a ternary complex of the metal, eriochromcyanine R and cetylpyridinium bromide, which is formed in an acetate buffer medium (pH = 3.5 − 5.5) and exhibits an absorption maximum at 630 nm. The system obeys the Lambert-Bear law for 0.2 − 2.7 ppm Pd (II). The mean relative standard deviation is 0.14%, the molar absorbitivity is 6.5×104 at the wavelength of the maximum difference between the absorbances of the sample and the blank, 630 nm, and the detection limit is 1.2×10−3 μg cm−2 for A = 0.001.