Method validation of As, Cd, Cr, Cu, Mn, Ni, Se, and Zn metals in Citarum River sediment using Inductively Coupled Plasma – Optical Emission Spectroscopy (ICP-OES)

Abstract

Abstract The Citarum River has a volcanic catchment area in West Java Province. It is also one of the nationally strategic rivers in tropical Indonesia due to its roles in water supply and in power generation. However, the Citarum River has experienced a decline in quality in which one of the causes is pollutants containing heavy metals. This research is aimed to validate the ICP-OES method in analyzing metals in sediment. Several parameters have been taken into account and evaluated for the validation of method, namely: linearity, the minimum detection limit, the limit of quantification, accuracy, and precision. The linearity of As, Cd, Cr, Cu, Mn, Ni, Se, and Zn was found satisfactory with coefficient of correlation (r) > 0.9995. The precision of all metals was calculated as relative standard deviation (RSD) and was found that the RSD value was < 2/3 CV Horwitz. The recovery value of all metals was found between 80-95%. The limit of detection (LOD) value for all metals was below 10 ug/L except for Zn and Mn. The method was validated using CRM PACS-3. Metal concentrations in the Citarum River sediment for all stations after being compared with the quality standard of ANZECC are still below the threshold values.