A method for analyzing the ∂18O of resin-extractable soil inorganic phosphate

Tal Weiner*, Shunit Mazeh, Federica Tamburini, Emmanuel Frossard, Stefano M. Bernasconi, Tommaso Chiti, Alon Angert

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Improved tools for tracing phosphate transformations in soils are much needed, and can lead to a better understanding of the terrestrial phosphorus cycle. The oxygen stable isotopes in soil phosphate are still not exploited in this regard. Here we present a method for measuring the oxygen stable isotopes in a fraction of the soil phosphate which is rapidly available to plants, the resin-extractable P. This method is based on extracting available phosphate from the soil with anion-exchange membranes, soil organic matter removal by a resin, purification by precipitation as cerium phosphate, and finally precipitation as silver phosphate. The purified silver phosphate samples are then measured by a high-temperature elemental analyzer (HT-EA) coupled in continuous flow mode to an isotope ratio mass spectrometer. Testing the method with Mediterranean and semi-arid soils showed no artifacts, as well as good reproducibility in the same order as that of the HT-EA analytical uncertainty (0.3‰).

Original languageAmerican English
Pages (from-to)624-628
Number of pages5
JournalRapid Communications in Mass Spectrometry
Volume25
Issue number5
DOIs
StatePublished - 15 Mar 2011

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