Meyliana Wulandari, Ashlasa Zata Zharfa, Denar Zuliandanu, Ahmad Syukri, Nofrizal Nofrizal, Pandian Bothi Raja
Chemical Oxygen Demand (COD) is a water quality parameter that shows the amount of oxygen used to oxidize organic substances. Seawater high in chloride ions can have interference with direct COD measurements unless the chloride concentration is below 2,000 mg/L. In general, silver nitrate (AgNO3) solution is used to mask the chloride interference in seawater. In this study, masking of chloride ions was carried out in seawater samples by using a 10.8% AgNO3 concentration. The developed method was linear over the 0-50 ppm concentration range. The limits of detection (LOD) and quantification (LOQ) were found to be 0.944 mg/L and 0.962 mg/L, respectively. Meanwhile, the robustness was found to be 2.905 mg/L. © 2025, Prince of Songkla University. All rights reserved.
Department of Chemistry, Faculty of Educational Science, State Islamic University (UIN) Syarif Hidayatullah, Jakarta, 15412, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Jakarta, 13220, Indonesia; Department of Chemistry, Faculty of Science and Technology, State Islamic University (UIN) Syarif Hidayatullah, Jakarta, 15412, Indonesia; PT ITEC Solution, West Java, Bogor, 16135, Indonesia; Department of Research and Development Centre, Lemigas, Jakarta, 12230, Indonesia; School of Chemical Sciences, Universiti Sains Malaysia, Penang, Minden, 11800, Malaysia
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