Uptake of dissolved lead by anhydrite surfaces |
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| Institution: | 1. Departamento de Cristalografía y Mineralogía, Universidad Complutense de Madrid, C/José Antonio Novais 2, Madrid 28040, Spain;2. Instituto de Geociencias (CSIC, UCM), C/José Antonio Novais 2, Madrid 28040, Spain;3. Departamento de Geología, Universidad de Oviedo, C/Jesús Arias de Velasco, Oviedo E-30005, Spain;4. Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany;1. Montana State University, Department of Chemical and Biological Engineering, Bozeman, MT 59717, USA;2. Montana State University, Center for Biofilm Engineering, Bozeman, MT 59717, USA;1. Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Republic of Korea;2. Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, Republic of Korea;3. Department of Internal Medicine, Kwandong University College of Medicine, Gangneung, Republic of Korea;4. Department of Internal Medicine, Kyung Hee University College of Medicine, Seoul, Republic of Korea;5. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Republic of Korea;6. Department of Internal Medicine, Inha University College of Medicine, Incheon, Republic of Korea;7. Department of Internal Medicine, Korea University College of Medicine, Seoul, Republic of Korea;1. Institute of Geology and Mineralogy, Siberian Branch of RAS, 3, Koptyug Ave., 630090 Novosibirsk, Russia;2. Novosibirsk State University, 2, Pirogova Str., 630090 Novosibirsk, Russia |
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| Abstract: | The fate of harmful metals in the Earth crust is importantly affected by sorption processes on mineral surfaces. Here, a study of the ability of anhydrite surfaces to uptake dissolved Pb is presented. Experiments were conducted at room temperature using initial Pb concentration (Pbaq]0) ranging between 10 and 1000 mg/L and a batch type set-up. Inductively coupled plasma optical emission spectrometry analyses showed that Pbaq] progressively decreased as the time of interaction increased, to reach a final steady state value of ～3.0 mg/L, irrespectively of Pbaq]0. However, the time elapsed before the steady state value was reached strongly depended on Pbaq]0, with the drop to this final value occurring in less than 1 day interaction when Pbaq]0 ? 50 mg/L and after 20 days when Pbaq]0 < 50 mg/L. Scanning Electron Microscopy and X-ray diffraction analyses confirmed the epitactic growth of anglesite (PbSO4) crystals on anhydrite surfaces when Pbaq]0 ? 50 mg/L. X-ray Absorption Near Edge Structure spectroscopy points to a different sorption mechanisms when Pbaq]0 < 50 mg/L. The results show that the epitactic growth of anglesite on anhydrite has no significant impact on the ability of anhydrite surfaces to remove Pbaq, which show equal effectiveness as that of gypsum surfaces. The high reactivity of anhydrite surfaces renders this phase potentially important in the control of the fate of dissolved metals in nature. |
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