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Biogenic phosphorus in oligotrophic mountain lake sediments: Differences in composition measured with NMR spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
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2006 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 40, no 20, 3705-3712 p.Article in journal (Refereed) Published
Abstract [en]

Phosphorus (P) composition in alkaline sediment extracts from three Swedish oligotrophic mountain lakes was investigated using P-31-NMR spectroscopy. Surface sediments from one natural lake and two mature reservoirs, one of which has received nutrient additions over the last 3 years, were compared with respect to biogenic P composition. The results show significant differences in the occurrence of labile and biogenic P species in the sediments of the different systems. The P compound groups that varied most between these three systems were pyrophosphate and polyphosphates, compound groups known to play an important role in sediment P recycling. The content of these compound groups was lowest in the reservoirs and may indicate a coupling between anthropogenic disturbances (i.e., impoundment) to a water system and the availability of labile P species in the sediment. A statistical study was also conducted to determine the accuracy and reliability of using P-31-NMR spectroscopy for quantification of sediment P forms.

Place, publisher, year, edition, pages
2006. Vol. 40, no 20, 3705-3712 p.
Keyword [en]
phosphorus species, P-31-NMR spectroscopy, reservoirs, oligotrophication, method validation, P-31-NMR accuracy
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-94215DOI: 10.1016/j.watres.2006.09.006ISI: 000242988600005PubMedID: 17070896OAI: oai:DiVA.org:uu-94215DiVA: diva2:167990
Available from: 2006-03-31 Created: 2006-03-31 Last updated: 2011-02-22Bibliographically approved
In thesis
1. Organic Phosphorus Compounds in Aquatic Sediments: Analysis, Abundance and Effects
Open this publication in new window or tab >>Organic Phosphorus Compounds in Aquatic Sediments: Analysis, Abundance and Effects
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Phosphorus (P) is often the limiting nutrient in lacustrine and brackish eco-systems, and enhanced input of P into an aquatic system might therefore negatively impact the environment. Because modern waste water manage-ment have reduced external P input to surface waters, internal P loading from the sediment has become one of the main P sources to aquatic ecosys-tems, in which relatively unknown organic P compounds seem to be more active in P recycling than previously thought.

This thesis focus is on improving analysis methods for organic P com-pounds in lacustrine and brackish sediments, as well as determining which of these compounds might be degraded, mobilized and subsequently recycled to the water column and on what temporal scale this occur. In both lacustrine and brackish environments, the most labile P compound was pyrophosphate, followed by different phosphate diesters. Phosphate monoesters were the least labile organic P compounds and degraded the slowest with sediment depth. In regulated lakes, it was shown that pyrophosphate and polyphos-phate compound groups were most related to lake trophic status, thus indi-cating their involvement in P cycling. This thesis also indicates faster P turn-over in sediment from the brackish environment compared to sediment from the lacustrine environment.

A comparison of organic P extraction procedures showed that pre-extraction with EDTA, and NaOH as main extractant, was most efficient for total P extraction. Using buffered sodium dithionite (BD) as a pre-extractant and NaOH as main extractant was most efficient for extracting the presuma-bly most labile organic P compound groups, pyrophosphate and polyphos-phate. Furthermore, it was determined that organic P compounds associated with humic substances were more recalcitrant than other P compounds, that the BD step used in traditional P fractionation might extract phosphate monoesters, and that NMR is a statistically valid method for quantification of organic P compounds in sediment extracts.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 57 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 160
Keyword
Environmental chemistry, Organic phosphorus, aquatic sediment, eutrophication, NMR, internal loading, sample preparation, extraction, degradation, Miljökemi
National Category
Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-6701 (URN)91-554-6508-0 (ISBN)
Public defence
2006-04-21, B41, BMC, Husargatan 3, Uppsala, 10:00
Opponent
Supervisors
Available from: 2006-03-31 Created: 2006-03-31 Last updated: 2011-06-10Bibliographically approved

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