Muhaimin, Muhaimin, Renaldy Prayoga, and Endah Eniati. 2022. “Determination of Chemical Oxygen Demand (COD) Concentration in Domestic Wastewater Using UV-Vis Spectrophotometry Method Based On The Effect Of Reflux Time And Preservation Time”. Stannum : Jurnal Sains Dan Terapan Kimia 4 (1), 13-18. https://doi.org/10.33019/jstk.v4i1.2866.