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Personen: Xiu, Wei (Autor) 
Guo, Huaming (Autor) 
Zhou, Xiaoqian (Autor) 
Wanty, Richard B. (Autor) 
Kersten, Michael (Autor) 
  
Titel: Change of arsenite adsorption mechanism during aging of 2-line ferrihydrite in the absence of oxygen
  
Quelle: Applied geochemistry. Bd. 88. H. Part B. Amsterdam : Elsevier Science. S. 149 - 157
Erscheinungsjahr:    2018
ISBN / ISSN: 0883-2927
URL der Originalveröffentlichung doi:10.1016/j.apgeochem.2017.08.001
  
Dokumentart:
Zeitschriftenaufsatz Zeitschriftenaufsatz
Sprache: Englisch
Open Access:
Person der Universität:    Kersten, Michael  In UnivIS suchen 
Einrichtung: Institut für Geowissenschaften
DDC-Sachgruppe:    Geowissenschaften
DFG-Fachgebiet: Geochemie, Mineralogie und Kristallographie
ID: 57853  Universitätsbibliothek Mainz
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Informationen zu den Nutzungsrechten unserer Inhalte Informationen zu den Nutzungsrechten unserer Inhalte
Abstract: Arsenite was effectively immobilized by 2-line ferrihydrite at different pH values (4.0, 5.5 and 7.4) and adsorbent dosages (0.4, 1, and 2 g/L) in the absence of oxygen, showing an initial surface diffusion-controlled period (Stage I, <2 h) and a second mixed intra-particle and surface diffusion-controlled period (Stage II, >2 h). Dissolved δ56Fe increased during Stage I and decreased during Stage II, resulting from aging of ferrihydrite and equilibrium isotopic exchange, respectively. The ferrihydrite aging was hampered by both high As concentrations and high pH values close to the pHzpc, due to inhibition of mineral dissolution as a prerequisite for mineral transformation. During Stage I, As was adsorbed by both bidentate binuclear corner-sharing (2C) and monodentate mononuclear corner-sharing complexes (1V), while 2C dominated during Stage II. At stage I, As stability was mainly controlled by As-complexation, by both mineral transformation and As complexation at stage II. It is suggested that adsorbed-As stability can be optimized by regulating As complexation and mineral phases, which are of great significance for remediation of As-contaminated groundwater.
   
  
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