Some Cautions on the Interpretation of Mössbauer Spectra in Mineralogical Studies of Volcanic Soils

Pizarro, Carmen; Furet, N. R.; Venegas, Ricardo; Fabris, José Domingos; Escudey, Mauricio

doi:10.4067/s0366-16442000000200011

Cited by 8 publications

(8 citation statements)

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“…OX and CBD treatments were first used to extract "active" forms of aluminum and iron, and results were taken as a criterion to characterize Andisols. More recent data in the scientific literature are specifically dedicated to the application of chemically selective treatments as ancillary methods for mineralogical studies of volcanic Chilean pedo-materials 15,16,17,18 , particularly of the two dominant soil orders, namely, Andisol and Ultisol.…”

Section: Introductionmentioning

confidence: 99%

Ammonium Oxalate and Citrate-Ascorbate as Selective Chemical Agents for the Mineralogical Analysis of Clay Fractions of an Ultisoland Andisols From Southern Chile

Pizarro¹,

Fabris²,

Stucki

et al. 2008

J. Chil. Chem. Soc.

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Two selective chemical treatments consisting of mixtures of (i) oxalic acid -ammonium oxalate at pH 3 (OX) and (ii) sodium citrate -ascorbic acid at pH 6 (CA) were used to selectively remove minerals from clay fractions of four volcanic soils: one from an Ultisol and three Andisols, of the southern Chile. Chemical analysis shows that CA is more effective in removing iron from Ultisol, and OX extracts it more efficiently from Andisols. 6 K 57 Fe-Mössbauer data indicate that OX tends to remove all magnetically ordered species with low hyperfine fields; CA has no clear effect on the removal of those or the identified iron oxides in these volcanic soil materials.

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Section: Introductionmentioning

confidence: 99%

Ammonium Oxalate and Citrate-Ascorbate as Selective Chemical Agents for the Mineralogical Analysis of Clay Fractions of an Ultisoland Andisols From Southern Chile

Pizarro¹,

Fabris²,

Stucki

et al. 2008

J. Chil. Chem. Soc.

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“…Several studies have been published on Mössbauer spectroscopy of volcanic soils (see for ex. [4][5][6][7]). Mössbauer spectra have been intensively studied for many iron rich minerals and reference data are available.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer, X-ray and Magnetic Studies of Black Sand from the Italian Mediterranean Sea

Braccini¹,

Pellegrinelli²,

Krämer³

2013

WJNST

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The study of natural magnetic sands is instrumental to investigate the geological aspects of their formation and of the origin of their territory. In particular, Mössbauer spectroscopy provides unique information on their iron content and on the oxidation state of iron in their mineral composition. The Italian coast on the Mediterranean Sea near Rome is known for the presence of highly magnetic black sands of volcanic origin. A study of the room temperature Mössbauer spectrum, powder X-ray diffraction, energy dispersive X-ray spectroscopy, and magnetic measurements of a sample of black magnetic sand collected on the seashore of the town of Ladispoli is performed. This study reveals magnetite as main constituent with iron in both tetrahedral and octahedral sites. Minor constituents are the iron minerals hematite and ilmenite, the iron containing minerals diopsite, gossular, and allanite, as well as ubiquitous sanidine, quartz, and calcite.

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“…For the sake of accuracy and in an attempt to seek for a physically more consistent interpretation, these set of spectra were deliberately not assigned to any iron oxide. By the way, the difficulty commonly found to safely interpret Mössbauer data of volcanic soil samples was duly reported earlier [14]. However, comparing both 298 K-and 80 K-Mössbauer data can directly draw essential qualitative information.…”

Section: Relative Transmissionmentioning

confidence: 94%

Preparative treatment with NaOH to selectively concentrate iron oxides of a Chilean volcanic soil material to produce effective heterogeneous Fenton catalyst

Manzo¹,

Pizarro²,

Rubio³

et al. 2011

Hyperfine Interact

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A Chilean volcanic Ultisol material was first size-fractionated so as to obtain the fraction with mean particle sizes φ < 53 μm. This sample was then sequentially treated three or five times with 5 mol L −1 NaOH, in an attempt to evaluate the effectiveness of the selective chemical dissolution to concentrate iron oxides, as a preparation procedure before using the materials as heterogeneous Fenton catalysts. The effects of those treatments on the iron oxides mineralogy were monitored with Mössbauer spectroscopy. The NaOH-treated samples were tested as catalysts towards the H 2 O 2 decomposition. Three or five sequential NaOH treatments were found to be comparably effective, by concentrating nearly the same proportion of iron oxides in the remaining solid phase (25.1 ± 0.4 and 23.3 ± 0.2 mass%, V. Manzo et al. respectively). 298 K-Mössbauer patterns were similar for both samples, with a central (super)paramagnetic Fe 3+ doublet and a broad sextet, assignable to several closely coexisting magnetically ordered forms of iron oxides. Despite of this nearly similar effect of the two treatments, the Ultisol material treated three times with NaOH presents higher heterogeneous catalytic efficiency and is more suitable to decompose H 2 O 2 than that with five treatments.

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Some Cautions on the Interpretation of Mössbauer Spectra in Mineralogical Studies of Volcanic Soils

Cited by 8 publications

References 0 publications

Ammonium Oxalate and Citrate-Ascorbate as Selective Chemical Agents for the Mineralogical Analysis of Clay Fractions of an Ultisoland Andisols From Southern Chile

Ammonium Oxalate and Citrate-Ascorbate as Selective Chemical Agents for the Mineralogical Analysis of Clay Fractions of an Ultisoland Andisols From Southern Chile

Mössbauer, X-ray and Magnetic Studies of Black Sand from the Italian Mediterranean Sea

Preparative treatment with NaOH to selectively concentrate iron oxides of a Chilean volcanic soil material to produce effective heterogeneous Fenton catalyst

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Some Cautions on the Interpretation of Mössbauer Spectra in Mineralogical Studies of Volcanic Soils

Cited by 8 publications

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Ammonium Oxalate and Citrate-Ascorbate as Selective Chemical Agents for the Mineralogical Analysis of Clay Fractions of an Ultisoland Andisols From Southern Chile

Ammonium Oxalate and Citrate-Ascorbate as Selective Chemical Agents for the Mineralogical Analysis of Clay Fractions of an Ultisoland Andisols From Southern Chile

M&#246;ssbauer, X-ray and Magnetic Studies of Black Sand from the Italian Mediterranean Sea

Preparative treatment with NaOH to selectively concentrate iron oxides of a Chilean volcanic soil material to produce effective heterogeneous Fenton catalyst

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Mössbauer, X-ray and Magnetic Studies of Black Sand from the Italian Mediterranean Sea