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  • 1
    Language: English
    In: Soil Research, 2018, Vol.56(4), p.396-403
    Description: The presence of geogenic CO has been recently identified as a soil-forming factor in soil on mofette sites. Topsoil samples (with a maximum CO concentration of 52% at 10 cm depth) were studied along a transect on a mofette site in the NW Czech Republic to further understand the processes within soil and the soil properties induced by CO in the soil atmosphere. Geogenic CO negatively affected the cation exchange capacity, the ratio of exchangeable Ca and Mg, and the total contents of Al, Mg and Mn. No effect was detected on a chemical index of weathering and the mineralogical composition of the clay fractions, which might be explained by the acidic parent material and the progress of soil development. Diffuse reflectance infrared spectroscopy indicated that the composition of particulate soil organic matter was partially affected by CO concentrations: the higher the CO concentrations, the smaller the extent of oxidative transformation and the smaller the abundance of carboxyl groups. In the clay fractions, stabilisation of transformed soil organic matter (SOM) was promoted by exchangeable Al. This study quantifies, for the first time, the correlation between geogenic CO and several inorganic soil properties and the composition of SOM in physical fractions.
    Keywords: DRIFT spectroscopy; mofette; stabilisation; weathering.
    ISSN: 1838-675X
    E-ISSN: 1838-6768
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  • 2
    Language: English
    In: Soil Research, 2018, Vol.56(4), p.396
    ISSN: 1838-675X
    Source: CrossRef
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  • 3
    Language: English
    In: Soil Research, 2015, Vol.53(4), p.392-400
    Description: This study focuses on optimising amorphous silica extraction from soils by using NaOH. Based on the results of this test series, a method for quantifying amorphous silica in soils from temperate-humid climate is proposed. All tests were carried out on materials of known composition (well-defined samples of feldspar, clay minerals, bio-opal, silica gel, and mixtures of these components) and on soil samples, to determine the optimum set of conditions, in terms of solid : solution ratio, temperature and extraction time, for dissolving amorphous silica without considerably attacking other solid silicon compounds.
    Keywords: alkaline extraction; silica dissolution; bio-opal.
    ISSN: 1838-675X
    E-ISSN: 1838-6768
    E-ISSN: 1446568X
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  • 4
    Language: English
    In: Soil Research, 2018, Vol.57(1), p.1-16
    Description: 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.
    Keywords: dithionite; organic complexes; oxalate; oxides; pyrophosphate; soil classification.
    ISSN: 1838-675X
    E-ISSN: 1838-6768
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