Ulya, M.R., Suharmanto, S., Saaduddin, S. and Supriyadi, D. 2023. Effect of pH and Surfactant Concentration Sodium Lignosulfonate (SLS) towards Reduction of Silica Mass from Geothermal Brine. JURNAL GEOCELEBES. 7, 1 (Apr. 2023), 37–43. DOI:https://doi.org/10.20956/geocelebes.v7i1.22130.