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| Titel |
Distribution of Thorium, Cesium, Yttrium and Zirconium in Alfisol pedons in the Catalan Coastal Range (NE Spain) |
| VerfasserIn |
J. Bech, J. Rustullet, P. Tume, N. Roca, F. J. Tobias, J. Garrigó, F. Reverter, P. Sanchez |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060317
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| Zusammenfassung |
| The aim of this study is to estimate the concentrations and vertical distributions of Th, Ce, Y,
and Zr in eleven Alfisol pedons from the NE Garraf Coastal massif (Catalonia, NE Spain).
These soils were developed mainly on Mesozoic limestones. The concentrations were
determined by XRF and the results were then compared to soil properties (pH, organic carbon
content, CaCO3, particle size distribution and Fe forms: total iron, Fet, dithionite-extractable
iron, Fed and oxalate-extractable iron,Feo). The range of Th values is: min 3 mgkg-1, max
16 mgkg-1, mean 10.4 mgkg-1 and median 11 mgkg-1. The range of Ce values is: min 22
mgkg-1, max 116 mgkg-1, mean 73.9 mgkg-1 and median 76 mgkg-1. The range of Y
values is: min 10 mgkg-1, max 43 mgkg-1, mean 27.5 mgkg-1 and median 27
mgkg-1. The range of Zr values is: min 101 mgkg-1, max 418 mgkg-1, mean 253
mgkg-1 and median 252 mgkg-1. The Th concentrations obtained are similar to
world soil and NASC values. These concentration data of Th, Ce, Y and Zr were
correlated with each other and with the soil properties. Th correlates positively with Ce
(0.95), Y (0.92), Zr (0.80), Fet (0.75), Fed (0.85) and Fed-Feo (0.85), clay% (0.55)
and silt% (0.31) and negatively with sand% and CaCO3. The correlations do not
indicate any significant relationship between Th and organic carbon or Feo. The
ranking of the horizons by Th concentration is: BC hor. (12.5 mgkg-1), Bt hor.
(11 mgkg-1), A hor. (10.1 mgkg-1) and finally C horizons (7.2 mgkg-1). The
ranking of the Alfisols by Th concentration, taking into account the litology is: those
derived from limestones (14.5 mgkg-1), those derived from schists (12.5 mgkg-1),
those originated over dolomites (11.8 mgkg-1), those developed over Pleistocene
colluvium (9.2 mgkg-1) and finally those originated over Keuper marls (6 mgkg-1). |
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