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| Titel |
Development and initial application of δ¹⁸Op to understand phosphorus cycling in river, lake and groundwater ecosystems |
| VerfasserIn |
Ben Surridge, Daren Gooddy, Rob Newton, Oliver Moore, Timothy Heaton, Daniel Lapworth, Ceri Davies |
| 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 |
250095839
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| Publikation (Nr.) |
 EGU/EGU2014-11314.pdf |
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| Zusammenfassung |
| Variation in the stable isotope composition of oxygen within dissolved phosphate (δ18Op)
represents a novel and potentially powerful environmental tracer. In freshwater, marine and
terrestrial ecosystems, δ18Op can act as an inherent label for the sources of phosphorus and
the extent to which phosphorus from different sources is metabolised. This paper focuses on
the methodological development and initial application of δ18Op across a range of freshwater
ecosystems. Initially, we report modifications to the analytical protocol for δ18Op that are
designed to minimise incorporation of contaminant oxygen in the final silver phosphate
precipitate prior to pyrolysis. This is critical given the range of possible sources of
contaminant oxygen within freshwater matrices. Subsequently, we consider the potential
utility of δ18Opthrough application of the technique within a range of freshwater ecosystems
in England, UK. Firstly, we characterise δ18Opin river water and effluents from Sewage
Treatment Works (STW), and examine the opportunity to use the δ18Op of STW
effluents to trace the entry and downstream fate of phosphorus from these point
sources in rivers. Secondly, we analyse δ18Opto gain insights into variations in
the sources and biological cycling of phosphorus in a seasonally-stratified lake
ecosystem. Thirdly, we characterise δ18Op in shallow and deep groundwater samples,
considering whether δ18Op might provide evidence for variation in source and
extent of metabolism for phosphorus in groundwater ecosystems. Taken together,
these data extend the catalogue of δ18Op in freshwater ecosystems, and further
the scope of δ18Op as a tool to better understand phosphorus biogeochemistry. |
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