Analytical Sciences

Abstract − Analytical Sciences, 22(11), 1469 (2006).

Metal Ion Extraction Using Newly-synthesized Bipyridine Derivative as a Chelating Reagent in Supercritical CO2
Yu BAI and Hai-Jian YANG
Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, P. R. China
4,4′-Bis(dihexylaminocarbonyl)-2,2′-bipyridine (BDC-Bipy) was synthesized and studied systematically as a chelating reagent for metal ions extraction in supercritical CO2. The compound showed high extraction efficiency for Co2+ (100%), Cu2+ (100%), Cd2+ (98.2%), and Zn2+ (100%) ions and good extraction efficiency for Sr2+ (79.4%) and Pb2+ (89.8%) when the extraction was performed in supercritical CO2 at 313 K and 25 MPa with the system of BDC-Bipy, deionized water and perfluoro-1-octanesulfonic acid tetraethylammonium salt. The recoveries of mixed metal ions were also measured; unfortunately, the system of extraction has no selectivity for the metal ions.