%0 Conference Proceedings %T A Thermodynamic Study of Complex Formation between Dicyclohexyl-18-Crown-6(DC18C6) with La3+, UO22+, Ag+ and NH4+ Cations in Acetonitrile-Tetrahydrofuran Binary Media %A Ronaghi, Gholam Hossein %A , %J 15th Iranian Seminar of Analytical Chemistry %D 2007