Yunsen SI, Qiufen HU, Guangyu YANG, Jiayuan YIN, Zhangjie HUANG

Color reaction of 2-(2-quinolylazo)-5-dimethylaminoanline with palladium and its application

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 1.35x$10^5 L mol^{-1} cm^{-1}$ at 600 nm. Beer's law is obeyed in the range of 0.01 to 0.6 $mu g$ $mL^{-1}$. The detection limit is 1.2 $mu g$ $L^{-1}$. This method has been applied to the determination of palladium with good results.

PDF

___

1.W. Bauer, W. Beck and W. Ponikwar, Zeit. Natur. 55, 946-952 (2000).
2.G. Patrick and P. Michel, Platinum. Met. Rev. 47, 60-72 (2003).
3.Y.E. Zeng, H.S. Zhang? and Z.H. Chen. "Handbook of Modern Chemical Reagents, the Fourth Fascicule, Chromogenic Agent of Inorganic Ion" 1st ed., Beijing, China, Chinese Chemical Industry Press.1989.
4.B.K. Reddy, K.J. Reddy, J.R. Kumar, A.K. Kumar and A.V. Reddy, Anal. Sci. 20(6), 925-930 (2004).
5.V. Vojkovic and V. Druskovic, Croat. Chem. Acta. 76(1), 87-92 (2003).
6.R.S. Lokhande, H.G. Nemade, A.B. Chaudhary and D.G. Hundiwale, Asian. J. Chem. 13(2), 596-602 (2001).
7.B. Maria and P. Katarzyna, Chem. Anal. 48, 87-95 (2003).
8.L.S. Sarma, J.R. Kumar, K.J. Reddy and A.V. Reddy, Anal. Sci. 18, 1257-1261 (2002).
9.D.L. Ma, F.L. Cui, D.S. Xia and Y.L. Wang, Anal. Lett. 35, 413-421 (2002).
10.D. Gholivand and B. Mohammad, Talanta. 52, 1055-1060 (2000).
11.Q.F. Hu, G.Y. Yang and J.Y. Yin, J. Environ. Monit. 4, 956-959, (2002).
12.G.Y. Yang, Q.F. Hu, G.Y. Yang, Z.J. Huang and J.Y. Yin, Anal. Sci. 19, 299-302 (2003).
13.G.Y. Yang, Z.J. Huang, Q.F. Hu and J.Y. Yin, Talanta. 58. 511-515 (2002).
14.Edited by Chinese Environment Protection Agency. "Analysis Method of Water and Waste Water", 3th ed. pp. 465-458, Beijing, China, Chinese Environmetal Science Press.
15.S.A. Dong, J. Chen and R.L. Wu. "Analysis Methods of Precious Metals", 1st ed.; Beijing, pp. 263-268,China, Chinese Science Press.