Extractability and FTIR-characteristics of poorly-ordered minerals in a collection of volcanic ash soils

Meijer, E.L.; Buurman, P.; Fraser, A. R.; Rodeja, E. García

doi:10.1007/978-3-540-48711-1_16

Cited by 5 publications

(8 citation statements)

References 26 publications

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“…Profile T4 represents an intergrade between the two groups (Buurman et al ., 1997). The allophane content was not determined for profile T9 at 1060 masl, but data from Meijer et al . (2007) indicate that it is allophanic, as expected from its position in the catena.…”

Section: Methodsmentioning

confidence: 99%

“…For this purpose, we chose a soil catena on the slope of Turrialba volcano in Costa Rica, the chemistry and mineralogy of which were previously studied in detail: Buurman et al . (1997) studied the grain‐size characteristics; Meijer & Buurman (1997) modelled the composition of the amorphous fractions; Meijer & Buurman (2003) discussed the total chemistry; and Meijer et al . (2007) characterized the amorphous silicates by FTIR and report sequential extractions of the amorphous fraction.…”

Section: Introductionmentioning

confidence: 99%

“…Because the information on the molecular composition of the organic matter in Andosols reported in the literature is very small, we decided to validate the above poorly supported hypotheses and preliminary findings on a larger and coherent data set of both allophanic and non-allophanic soil samples. For this purpose, we chose a soil catena on the slope of Turrialba volcano in Costa Rica, the chemistry and mineralogy of which were previously studied in detail: Buurman et al (1997) studied the grain-size characteristics; Meijer & Buurman (1997) modelled the composition of the amorphous fractions; Meijer & Buurman (2003) discussed the total chemistry; and Meijer et al (2007) characterized the amorphous silicates by FTIR and report sequential extractions of the amorphous fraction. The catena covers a wide range of altitudes (660-3300 masl).…”

Section: Introductionmentioning

confidence: 99%

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Soil organic matter chemistry in allophanic soils: a pyrolysis‐GC/MS study of a Costa Rican Andosol catena

Buurman¹,

Peterse

Almendros³

2007

European J Soil Science

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183

148

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Soil organic matter (SOM) in allophanic soils is supposed to accumulate due to protection caused by binding to allophane, aluminium and iron. We investigated a catena of allophanic and non-allophanic soils in Costa Rica to determine the effect of such binding mechanisms on SOM chemistry. These soils contain no contribution of black carbon. Molecular characterization of litter, extractable and dispersed organic matter was done by Curie-point pyrolysis-GC/MS. The molecular chemistry of the organic fractions indicates a strong decomposition of plant-derived organic matter and a strong contribution of microbial sugars and N-compounds to SOM. Both the decomposition of plant-derived SOM -including that of relatively recalcitrant compounds -and the relative contribution of microbial SOM were greater in allophanic samples than in non-allophanic ones. This suggests that chemical protection does not act on primary OM, although it may influence the accumulation of secondary OM in these soils. The effect of allophane on SOM contents in such perhumid soils is probably through incorporation of decomposition products and microbial SOM in very fine aggregates that -in a perhumid environment -remain saturated with water during much of the year. Greater concentrations of aliphatics are found in allophanic residues, but there is no evidence of any specific mineral-organic binding. The results do not support the existing theory of chemical protection of plant-derived components through binding to allophane, iron and aluminium.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soil organic matter chemistry in allophanic soils: a pyrolysis‐GC/MS study of a Costa Rican Andosol catena

Buurman¹,

Peterse

Almendros³

2007

European J Soil Science

Self Cite

183

148

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“…The Al/Si ratios of the Icelandic allophanes (and imogolite, combined in the bulk soil) range generally between 0.8 and 2 (AUI soil database), with vitric soils having this ratio near 1, and allophanes in andic soil horizons having a cluster around 1.2, however, with a large variability. Meijer et al (2007) reported Al/Si ratios of 0.9-1.1 (one with 1.5) for peons from three EU COST profiles in Iceland. These values represent a lower Al/Si range than commonly found for the world's Andosols, which is most likely attributed to the basaltic nature and the rapid weathering of the parent materials.…”

Section: Allophane and Imogolitementioning

confidence: 95%

Genesis and Mineralogical Characteristics

Arnalds

2015

World Soils Book Series

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“…Evidence that pyrophosphate does not selectively extract organically bound Fe, but also Fe from poorly crystalline Fe oxides was published in the late 1960s (Bascomb 1968;Grimme and Wiechmann 1969) and repeatedly confirmed (e.g. Higashi et al 1981;Jeanroy and Guillet 1981;Evans and Wilson 1985;Skjemstad et al 1990Skjemstad et al , 1992Meijer et al 2007). According to Parfitt and Childs (1988), pyrophosphate-extractable Fe (Fe py ) does not specifically relate to any particular form of Fe in soils and it should not be used to estimate Fe in humus complexes.…”

Section: Pyrophosphatementioning

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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Extractability and FTIR-characteristics of poorly-ordered minerals in a collection of volcanic ash soils

Cited by 5 publications

References 26 publications

Soil organic matter chemistry in allophanic soils: a pyrolysis‐GC/MS study of a Costa Rican Andosol catena

Soil organic matter chemistry in allophanic soils: a pyrolysis‐GC/MS study of a Costa Rican Andosol catena

Genesis and Mineralogical Characteristics

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

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