• Impact of Residual Hydrofluoric Acid on Leaching of Minerals and Arsenic from Different Types of Geological Media
  • Jeon, Pilyong;Moon, Hee Sun;Shin, Doyun;Hyun, Sung Pil;
  • Groundwater and Ecohydrology Research Center, Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources;Groundwater and Ecohydrology Research Center, Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources;Resource Recovery Research Center, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources;Center for HLW Geological Disposal, Climate Change Mitigation and Sustainability Division, Korea Institute of Geoscience and Mineral Resources;
  • 잔류 불산에 의한 모델 지질토양시료의 광물 용해 및 비소 용출 특성
  • 전필용;문희선;신도연;현성필;
  • 한국지질자원연구원 지질환경연구본부 지하수생태연구센터;한국지질자원연구원 지질환경연구본부 지하수생태연구센터;한국지질자원연구원 광물자원본부 자원회수연구센터;한국지질자원연구원 전략연구본부 방사성폐기물연구단;
Abstract
This study explored secondary effects of the residual hydrofluoric acid (HF) after a hypothetical acid spill accident by investigating the long-term dissolution of minerals and leaching of pre-existing arsenic (As) from two soil samples (i.e., KBS and KBM) through batch and column experiments. An increase in the HF concentration in both soil samples resulted in a dramatic increase in the release of major cations, especially Si. However, the amounts of mineral dissolved were dependent on the soil type and mineral characteristics. Compared to the KBM soil, relatively more Ca, Mg and Si were dissolved from the KBS soil. The column experiment showed that the long-term dissolution rates of the minerals are closely associated with the acid buffering capacity of the two soils. The KBM soil had relatively higher effluent pH values compared to the KBS soil. Also, more As was leached from the KBM soil, with a more amorphous hydrous oxide-bound As fraction. These results suggest that the potential of heavy metal leaching by the residual acid after an acid spill will be influenced by heavy metal speciation and mineral structure in the affected soil.

Keywords: Chemical spill accident;Hydrofluoric acid;Mineral dissolution;Arsenic;Residual acid;

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