TRANSPORT OF Cr(III), Cd(II), Pb(II), AND Ag(I) IONS THROUGH BULK LIQUID MEMBRANE CONTAINING p-tert-BUTYLCALIX[4]ARENE –TETRAETHYLESTER AS ION CARRIER - Maming, Maming; Chemistry Department, Faculty of Mathematics and Natural Sciences, Hasanuddin University, Makassar (Universitas Gadjah Mada, 2010)