DETERMINATION OF pH EFFECT AND CAPACITY OF HEAVY METALS ADSORPTION BY WATER HYACINTH (Eichhornia crassipes) BIOMASS - Shofiyani, Anis; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Univeristy of Tanjungpura, Jl. A. Yani Pontianak 78124 (Universitas Gadjah Mada, 2010)