Abstract
ABSTRACT This study investigates the impact of untreated wastewater on a section of the Euphrates River in Al-Diwaniyah, Iraq. The unregulated discharge of sewage and industrial effluents has caused severe pollution in this area. The research measures electrical conductivity, turbidity, total dissolved solids, dissolved oxygen, total hardness, biological oxygen demand and heavy metals (Ni, Cr, Pb, Co, Cd, Cu, Fe) using Inductively Coupled Plasma Atomic Emission Spectrometry. Approximately 40 water sampling stations were selected for analysis and the Heavy Metal Pollution Index (HPI) was used to assess water quality. The study employed Inverse Distance Weighting (IDW) tool, to predict HPI values and their spatial distribution. The accuracy of prediction maps was evaluated using regression analysis by comparing observed values with predicted values from the maps. The study emphasizes the excessive pollution levels in the Euphrates River, specifically exceeding Iraqi standard thresholds for Ni, Fe, and Cd concentrations.
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