SULAIMAN, NUR. “PENENTUAN PH OPTIMUM ADSORPSI ION LOGAM Cr(VI) OLEH KITOSAN BEAD DAN KITOSAN-SILIKA BEAD (DETERMINATION OF OPTIMUM PH ADSORPTION METAL ION Cr (VI) BY CHITOSAN BEAD AND CHITOSAN-SILICA BEAD)”. Unesa Journal of Chemistry, vol. 2, no. 1, Jan. 2013, doi:10.26740/ujc.v2n1.p%p.