Waste Disposal in Clay Formations: Influence of Humic Acid on the Migration of Heavy-Metal Pollutants



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Heavy metal and rock: Humic acid (HA) in natural clays can play an important role in the (im)mobilization (complexation) of toxic metal ions such as radionuclides in the deep geological disposal of high-level radioactive waste. To better understand the influencing factors, the sorption behavior of Eu3+ and Gd3+ ions, as homologues of the actinides Am and Cm, was studied under various conditions.