Asmara, Anjar, et al. “ OPTIMISATION OF SULFURIC ACID CONCENTRATION FOR ENHANCED FE2+ ION REMOVAL USING ACTIVATED CHARCOAL FROM BOILED PEANUT SHELLS: CHARACTERISATION AND PERFORMANCE EVALUATION ”. Lingkar: Journal of Environmental Engineering, vol. 5, no. 1, Nov. 2024, pp. 10-18, https://journal.ar-raniry.ac.id/index.php/lingkar/article/view/5080.