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| Titel |
Use of 7Be as a sediment tracer: a scope for testing and refining key assumptions related to its adsorption on a catchment scale |
| VerfasserIn |
Nick Ryken, Bashar Al-Barri, Will Blake, Alex Taylor, Pascal Boeckx, Ann Verdoodt |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094489
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| Publikation (Nr.) |
 EGU/EGU2014-9901.pdf |
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| Zusammenfassung |
| To date the use of Beryllium-7 (7Be) as a sediment tracer on catchment scale is largely
understudied, although several studies applied the ratio 7Be/137Cs or 7Be/210Pbex for
sediment source fingerprinting. Several key assumptions, (1) spatially uniform fallout, (2)
immediate adsorption upon contact with the soil and (3) irreversible adsorption
by the soil, must hold if 7Be is to be used as a sediment tracer. However, recent
studies have raised questions about the validity of these assumptions in the changing
environments on a catchment scale. In this study three representative soil types of the
Mariaborrebeek catchment, a small watershed located in the Flemish Ardennes in
Belgium, were collected to assess the adsorption rate of 7Be on the soil surface in this
catchment. In a laboratory experiment, soil samples were equilibrated with a stable Be
solution of 1 mg l-1 at a soil:solution ratio of 1:10 and the adsorption of Be was
measured at different time intervals. Furthermore, different amendments were applied
to assess the impact of soil pH, fertilizer and organic matter on the adsorption of
Be. Preliminary results confirm a rapid and almost complete Be adsorption and a
negative correlation between pH and Be adsorption. The results of this study might
lead to the formulation of interpretation guidelines for the use of 7Be to assess
short-term soil redistribution and sediment source fingerprinting on catchment scale. |
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