Selective dissolution of Fe–Ti oxides — Extractable iron as a criterion for andic properties revisited

Algoe, Chandra; Stoops, Georges; Vandenberghe, R. E.; Ranst, Éric Van

doi:10.1016/j.catena.2011.11.016

Cited by 19 publications

(6 citation statements)

References 21 publications

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“…The Fuller test results indicated that the magnetite in these regions is detrital in origin (Fuller et al, 2002;Figure 4c). Magnetite abundance, calculated by comparing the massnormalized saturation magnetization with that of pure magnetite (Klein et al, 2014), in all lower Belt samples is approximately 1-8 ppm (Table S5); this is much lower than the 0.08 to 0.7 wt% magnetite inferred from the iron speciation extraction for magnetite in samples from the same formation (Planavsky et al, 2011;see supporting information;Algoe et al, 2012;Burton et al, 2006;Raiswell et al, 2011;Reinhard et al, 2009;Reuschel et al, 2012;Slotznick, Swanson-Hysell, & Sperling, 2018). We therefore interpret the magnetite as detrital grains that remained after incomplete reaction with porewater sulfide to form pyrite.…”

Section: 1029/2018gl081496mentioning

confidence: 86%

Mid‐Proterozoic Ferruginous Conditions Reflect Postdepositional Processes

Slotznick

Webb

Kirschvink

et al. 2019

Geophysical Research Letters

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To evaluate the mechanics of mid‐Proterozoic environmental iron transport and deposition, we coupled microscale textural and bulk rock magnetic techniques to study the ~1.4‐Ga lower Belt group, Belt Supergroup, Montana and Idaho. We identified a pyrrhotite‐siderite isograd that marks metamorphic iron‐bearing mineral reactions beginning in subgreenschist facies samples. Even in the best‐preserved parts of the basin, secondary overprints were common including recrystallization of iron‐bearing sulfides, base metal sulfides, and nanophase pyrrhotite. Despite these overprints, a record of redox chemistry was preserved in the early diagenetic framboidal pyrite and detrital iron oxides including trace nanoscale magnetite that remained after sulfidization in anoxic and sulfidic sedimentary pore fluids. Based on these results, we interpret the Belt Basin as having oxic waters, at least in shallow‐water environments, with no indication of abundant ferrous iron in the water column; this is consistent with the cooccurrence of early eukaryotic fossils within the same strata.

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Section: 1029/2018gl081496mentioning

confidence: 86%

Mid‐Proterozoic Ferruginous Conditions Reflect Postdepositional Processes

Slotznick

Webb

Kirschvink

et al. 2019

Geophysical Research Letters

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“…These are not SRO minerals, so the general equalisation of 'SRO minerals' and 'AOD extractable' is incorrect. In addition, tropical soils derived from volcanic materials and rich in magnetite, may have larger contents of AOD-extractable Fe (Fe AOD ) than of Fe DC(B) (Algoe et al 2012). Depending on its crystallinity, AOD may dissolve lepidocrocite completely or to very small extent (Schwertmann and Taylor 1972;Poulton and Canfield 2005).…”

Section: Ammonium Oxalate-oxalic Acidmentioning

confidence: 99%

“…Thus, Tiron is not restricted to oxides, as originally intended. For non-weathered materials lacking metal-SOM associations and containing Fe-Ti oxides, Algoe et al (2012) suggested Tiron to quantify SRO-Fe oxides.…”

Section: Further Extractantsmentioning

confidence: 99%

Wet-chemical extractions to characterise pedogenic Al and Fe species – a critical review

Rennert¹

2019

Soil Res.

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Wet-chemical extraction of soil is a standard procedure to characterise pedogenic aluminium (Al) and iron (Fe) species, especially oxides, allophanic minerals and metal–organic associations. This article critically reviews the suitability of commonly used extractants (e.g. dithionite, oxalate and pyrophosphate) and the potentials and restrictions in their use for species identification and in soil classification. None of the commonly used extractants is completely selective and quantitative. The degree of completeness differs between the extractants and depends on soil composition. Dithionite-based methods provide a ‘pseudo-total’ content of pedogenic Fe oxides, as they are not always completely dissolved. Oxalate may attack further non-target species, releasing additional Al and Fe. Therefore, the extraction of Al and Fe exclusively from poorly crystalline species is not always guaranteed. As a consequence of dispersion of aggregates, pyrophosphate solubilises both mineral particles and metals from organic associations. Thus, quantification of species based on these extractions and their implementation in pedogenic thresholds may be questionable. Alternative extractants such as citrate–ascorbate and dithionite–citrate–oxalate could be used in addition, as applicable and reliable wet-chemical extractions will be still demanded for research and practical applications. The examination of the effectiveness and selectivity of wet-chemical extraction methods by spectroscopic techniques is recommended.

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“…García et al (2004) y Jansen et al (2011, indican que existen diferentes métodos de disoluciones selectivas que son usados en el fraccionamiento y en la cuantificación del Al, Fe y Si activos de los Andisoles, en donde se utilizan extractantes como el cloruro de potasio, el pirofosfato de sodio, el oxalato ácido de amonio, el ditionito-citrato-bicarbonato y el hidróxido de sodio. Estos métodos de extracciones selectivas generalmente se han aplicado de forma individual sobre muestras frescas de suelo y aunque se ha probado que son eficientes en la estimación de las diferentes fracciones de Al, Fe y Si y que permiten obtener resultados confiables y reproducibles en la mayoría de los suelos, también existen investigaciones donde se ha observado que los extractantes no son totalmente selectivos y que en algunos casos pueden disolver componentes sólidos diferentes a los definidos para un método en particular Kleber et al, 2004;Jansen et al, 2011;Algoe et al, 2012).…”

Section: Marco Teóricounclassified

Extracciones selectivas y secuenciales de Al, Fe y Si en un Andisol del Oriente antioqueño, Colombia

et al. 2018

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Se estudió la extracción selectiva y secuencial de las fracciones de Al, Fe y Si (cloruro de potasio, pirofosfato de sodio, oxalato ácido de amonio, ditionito-citrato-bicarbonato e hidróxido de sodio) de un Andisol del Oriente antioqueño con fines genéticos, lo cual, permitió separar horizontes alofánicos y no alofánicos. En los horizontes A y 2B/A la fracción coloidal estuvo dominada por complejos organometálicos, mientras que en los horizontes 3C/A y 4Bs predominaron los aluminosilicatos y los óxidos e hidróxidos no cristalinos. Este método también logró diferenciar dentro del horizonte A, por lo menos, dos subhorizontes no visualizados en campo. Los bajos contenidos de Ald, Fed y Sid y de Aln y Fen reportados pueden deberse a las extracciones previas realizadas con pirofosfato de sodio y oxalato ácido de amonio, en las que se liberó la mayor proporción del Al, Fe y Si y a las bajas cantidades de coloides inorgánicos cristalinos que presentan los Andisoles.

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Selective dissolution of Fe–Ti oxides — Extractable iron as a criterion for andic properties revisited

Cited by 19 publications

References 21 publications

Mid‐Proterozoic Ferruginous Conditions Reflect Postdepositional Processes

Mid‐Proterozoic Ferruginous Conditions Reflect Postdepositional Processes

Wet-chemical extractions to characterise pedogenic Al and Fe species – a critical review

Extracciones selectivas y secuenciales de Al, Fe y Si en un Andisol del Oriente antioqueño, Colombia

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