A New Technique to Determine the Phosphate Oxygen Isotope Composition of Freshwater Samples at Low Ambient Phosphate Concentration

The oxygen isotope composition of dissolved inorganic phosphate (δ18Op) offers new opportunities to understand the sources and the fate of phosphorus (P) in freshwater ecosystems. However, current analytical protocols for determining δ18Op are unable to generate reliable data for samples in which am...

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Bibliographic Details
Published in:Environmental science & technology 2019-09, Vol.53 (17), p.10288-10294
Main Authors: Tcaci, Marina, Barbecot, Florent, Hélie, Jean-Francois, Surridge, Ben W. J, Gooddy, Daren C
Format: Article
Language:English
Subjects:
Aquatic ecosystems
Biogeochemistry
Contamination
Freeze drying
Freshwater ecosystems
Isotope composition
Isotope ratios
Isotopes
Mass spectrometry
Mass spectroscopy
Oxygen
Oxygen isotopes
Phosphates
Phosphorus
Protocol
Rivers
Water analysis
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Summary:The oxygen isotope composition of dissolved inorganic phosphate (δ18Op) offers new opportunities to understand the sources and the fate of phosphorus (P) in freshwater ecosystems. However, current analytical protocols for determining δ18Op are unable to generate reliable data for samples in which ambient P concentrations are extremely low, precisely the systems in which δ18Op may provide new and important insights into the biogeochemistry of P. In this Article, we report the development, testing and initial application of a new technique that enables δ18Op analysis to be extended into such ecosystems. The twist spinning mode (TSM) protocol described here enables >1000 L of sample with a P concentration
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.9b00631