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The aim of this study was to determine the contamination of heavy metals from groundwater in the surroundings of the old landfill site in Udon Thani, Thailand. The sampling points were four wells on different locations of the old landfill. The groundwater was collected during dry season of 2019 to 2021. All the samples were analyzed for three physicochemical parameters, such as conductivity (EC), pH and Total Dissolved Solids (TDS), and were measured on-site using HQ40D multi meter. The results of this study were within the allowable limit: The concentration of heavy metals includes Cd, Pb, Zn, Cu, Mn and Fe using the Perkin Elmer Optima 8000 Series Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES). The analysis indicated that concentration of the heavy metals was mostly below studies detection limit and far below the WHO international best standards. Most of the sites among those showed low enough levels of heavy metal contamination in the groundwater that it would not affect the health of humans and the environment around the landfill.
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