THE ISOTHERMIC ADSORPTION OF Pb(II), Cu(II) AND Cd(II) IONS ON Nannochloropsis sp ENCAPSULATED BY SILICA AQUAGEL - Sembiring, Zipora; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Lampung University Jl. Soemantri Brojonegoro No.1 Gedung Meneng Bandar Lampung 35145 (Universitas Gadjah Mada, 2010)