title: Spectrophotometric determination of palladium after solid-liquid extraction with 1-(2-Pyridylazo)-2-naphthol at 90 degrees C.
abstract: An effective spectrophotometric determination of palladium with 1-(2-pyridylazo)-2-naphthol (PAN) using molten naphthalene as a diluent has been studied. A green complex of palladium with PAN is formed at 90 degrees C. In the range of pH 1.5-7.5, the complex is quantitatively extracted into molten naphthalene. The organic phase is anhydrously dissolved in CHCl(3) to be determined spectrophotometrically at 678 nm against the reagent blank. Beer's law is obeyed over the concentration range of 0.5-10 ppm. The molar absorptivity and Sandell's sensitivity are 1.2 x 10(4) l mol(-1) cm(-1) and 0.0070 mg cm(-2), respectively. The optimum conditions for determination are obtained. The interferences of various ions are observed in detail. The method has been applied to the determination of palladium in synthetic samples.
authors.affiliation: Department of Chemistry, Northwest Normal University, Lanzhou, 730070, People's Republic of China.
authors.forename: J
authors.initials: J
authors.lastname: Gao
authors.forename: B
authors.initials: B
authors.lastname: Peng
authors.forename: H
authors.initials: H
authors.lastname: Fan
authors.forename: J
authors.initials: J
authors.lastname: Kang
authors.forename: X
authors.initials: X
authors.lastname: Wang