PANGERAN, A. B.; AFANDY, M. A.; SAWALI, F. D. I. Efficiency of FeSO4.7H2O as a Coagulant on Chromium Hexavalent Removal Using Coagulation-Flocculation Process: Optimization Using Response Surface Methodology. Jurnal Teknik Kimia dan Lingkungan, [S. l.], v. 7, n. 2, p. 123–133, 2023. DOI: 10.33795/jtkl.v7i2.3560. Disponível em: https://jurnal.polinema.ac.id/index.php/jtkl/article/view/3560. Acesso em: 3 nov. 2026.