2010
DOI: 10.1021/es101903y
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Transformation of Two-Line Ferrihydrite to Goethite and Hematite as a Function of pH and Temperature

Abstract: Under oxic aqueous conditions, two-line ferrihydrite gradually transforms to more thermodynamically stable and more crystalline phases, such as goethite and hematite. This temperature- and pH-dependent transformation can play an important role in the sequestration of metals and metalloids adsorbed onto ferrihydrite. A comprehensive assessment of the crystallization of two-line ferrihydrite with respect to temperature (25, 50, 75, and 100 °C) and pH (2, 7, and 10) as a function of reaction time (minutes to mont… Show more

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Cited by 313 publications
(260 citation statements)
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“…This could be what triggers limited desorption by ion exchange in this case, due to the difference in electric charge between the electrolyte and ferrihydrite PZC (Table S2). Ferrihydrite transformation to goethite should not affect the results of this study (~1% transformed after 500 h [64]). …”
Section: Arsenic Release From Ferrihydritementioning
confidence: 70%
“…This could be what triggers limited desorption by ion exchange in this case, due to the difference in electric charge between the electrolyte and ferrihydrite PZC (Table S2). Ferrihydrite transformation to goethite should not affect the results of this study (~1% transformed after 500 h [64]). …”
Section: Arsenic Release From Ferrihydritementioning
confidence: 70%
“…Iron oxide transforming process is related to pH, temperature, the presence of ferrous ions, and the type of anions, such as chloride sulphate and oxyanions. Iron(hydro)oxide system is also redox sensitive (Lin et al 2008;Das et al 2011).…”
Section: Resultsmentioning
confidence: 99%
“…Although ferrihydrite is comparatively bioavailable and is found in a wide range of environments, it is metastable and often undergoes phase transitions to more crystalline ferric iron oxides (e.g., hematite and goethite). Studies have shown that accelerated transformation of ferrihydrite to hematite and/or goethite occurs under conditions of elevated temperature and salt concentration, typical of a kilometer-deep-subsurface environment (65,66). Therefore, these more crystalline ferric iron minerals may be more representative of the Fe(III) oxide minerals found in deep-subsurface environments and are likely to be available to sustain survival and growth of the DMRB.…”
Section: Discussionmentioning
confidence: 99%