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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 6
BKCSDE 26(6)
June 20, 2005 

 
Title
Spectrophotometric Determination of Palladium after Solid-liquid Extraction with 4-(2-Pyridylazo)-resorcinol at 90oC
Author
Yanjie Dong*, Ke Gai
Keywords
Molten naphthalene, Palladium, Solid-liquid extraction, Spectrophotometric
Abstract
An effective spectrophotometric determination of palladium with 4-(2-pyridylazo)-resorcinol (PAR) using molten naphthalene as a diluent has been studied. A red complex of palladium with PAR is formed at 90 oC. In the range of pH 9.0-11.0, the complex is quantitatively extracted into molten naphthalene. The organic phase is anhydrously dissolved in CHCl3 to be determined spectrophotometrically at 520 nm against the reagent blank. Beer’s law is obeyed over the concentration range of 0.1-2 μg·mL-1. The molar absorptivity and Sandell’s sensitivity are 8.0 × 105 L·mol-1·cm-1 and 0.49 μg·cm-2 respectively. From the results of tolerance limits, it was found that there was no interferences were observed for most of the ions examined and those somewhat high interferences by Co(II), Fe(II) and Bi(III) could be effectively masked by EDTA.
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