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Muhaimin, M., Prayoga, R. and Eniati, E. 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 (May 2022), 13-18. DOI:https://doi.org/10.33019/jstk.v4i1.2866.