Turkish Journal of ChemistryColor Reaction of 2-(2-Quinolylazo)-5-Dimethylaminoaniline with Palladium and Its Application
Guangyu YANG1, Jiayuan YIN1
1Department of Chemistry, Yunnan University; Kunming 650091, P.R. CHINA
2Science College, Kunming University of Technology; Kunming 650031, P.R. CHINA
Abstract: A new chromogenic reagent, 2-(2-quinolylazo)-5-dimethylaminoaniline (QADMAA) was synthesized. A sensitive, selective and rapid method for the determination of palladium based on the rapid reaction of palladium(II) with QADMAA was developed. In the presence of 0.5-2.5 mol L-1 of hydrochloric acid solution and cetyl trimethylammonium bromide medium QADMAA reacts with palladium to form a violet complex with a molar ratio of 1:2 (palladium to QADMAA). The molar absorptivity of the chelate is 1.35x105 L mol-1 cm-1 at 600 nm. Beer's law is obeyed in the range of 0.01 to 0.6 m g mL-1. The detection limit is 1.2 m g L-1. This method has been applied to the determination of palladium with good results.
Key Words: 2-(2-quinolylazo)-5-dimethylaminoaniline, palladium, spectrophotometry
Turk. J. Chem., 29, (2005), 135-140.
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Other articles published in the same issue: Turk. J. Chem.,vol.29,iss.2.