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Sediment Depth Attenuation of Biogenic Phosphorus Compounds Measured by 31P NMR
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.ORCID iD: 0000-0003-3509-8266
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
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2005 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 39, no 3, 867-872 p.Article in journal (Refereed) Published
Abstract [en]

Being a major cause of eutrophication and subsequent loss of water quality, the turnover of phosphorus (P) in lake sediments is in need of deeper understanding. A major part of the flux of P to eutrophic lake sediments is organically bound or of biogenic origin. This P is incorporated in a poorly described mixture of autochthonous and allochthonous sediment and forms the primary storage of P available for recycling to the water column, thus regulating lake trophic status. To identify and quantify biogenic sediment P and assess its lability, we analyzed sediment cores from Lake Erken, Sweden, using traditional P fractionation, and in parallel, NaOH extracts were analyzed using 31P NMR. The surface sediments contain orthophosphates (ortho-P) and pyrophosphates (pyro-P), as well as phosphate mono- and diesters. The first group of compounds to disappear with increased sediment depth is pyrophosphate, followed by a steady decline of the different ester compounds. Estimated half-life times of these compound groups are about 10 yr for pyrophosphate and 2 decades for mono- and diesters. Probably, these compounds will be mineralized to ortho-P and is thus potentially available for recycling to the water column, supporting further growth of phytoplankton. In conclusion, 31P NMR is a useful tool to asses the bioavailability of certain P compound groups, and the combination with traditional fractionation techniques makes quantification possible.

Place, publisher, year, edition, pages
2005. Vol. 39, no 3, 867-872 p.
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Analytical Chemistry Organic Chemistry Ecology
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URN: urn:nbn:se:uu:diva-83615DOI: 10.1021/es049590hISI: 000226712600036PubMedID: 15757351OAI: oai:DiVA.org:uu-83615DiVA: diva2:111523
Available from: 2007-01-29 Created: 2007-01-29 Last updated: 2017-11-30Bibliographically approved

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Ahlgren, JoakimTranvik, LarsGogoll, AdolfWaldebäck, MonicaMarkides, KarinRydin, Emil

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