Ikhsan, J., Sulastri, S. and Priyambodo, E. (2015) “THE EFFECT OF pH ON THE ADSORPTION OF MICRONUTRIENT CATIONS OF Ca 2+ AND K + BY SILICA FROM LAPINDO MUD”, Jurnal Penelitian Saintek, 20(1). doi: 10.21831/jps.v20i1.5603.