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Ahlgren, Joakim
Publications (5 of 5) Show all publications
Ahlgren, J., De Brabandere, H., Reitzel, K., Rydin, E., Gogoll, A. & Waldebäck, M. (2007). Sediment Phosphorus Extractants for Phosphorus-31 Nuclear Magnetic Resonance Analysis: A Quantitative Evaluation. Journal of Environmental Quality, 36(3), 892-898
Open this publication in new window or tab >>Sediment Phosphorus Extractants for Phosphorus-31 Nuclear Magnetic Resonance Analysis: A Quantitative Evaluation
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2007 (English)In: Journal of Environmental Quality, ISSN 0047-2425, E-ISSN 1537-2537, Vol. 36, no 3, p. 892-898Article in journal (Refereed) Published
Abstract [en]

The influence of pre-extractant, extractant, and post-extractant on total extracted amounts of P and organic P compound groups measured with 31P nuclear magnetic resonance (31P-NMR) in lacustrine sediment was examined. The main extractants investigated were sodium hydroxide (NaOH) and sodium hydroxide ethylenediaminetetraacetic acid (NaOH-EDTA) with bicarbonate buffered dithionite (BD) or EDTA as pre-extractants. Post extractions were conducted using either NaOH or NaOH-EDTA, depending on the main extractant. Results showed that the most efficient combination of extractants for total P yield was NaOH with EDTA as pre-extractant, yielding almost 50% more than the second best procedure. The P compound groups varying the most between the different extraction procedures were polyphosphates and pyrophosphates. NaOH with BD as pre-extractant was the most efficient combination for these compound groups.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:uu:diva-94217 (URN)10.2134/jeq2006.0235 (DOI)000246430500028 ()17485721 (PubMedID)
Available from: 2006-03-31 Created: 2006-03-31 Last updated: 2017-12-14Bibliographically approved
Ahlgren, J., Reitzel, K., Danielsson, R., Gogoll, A. & Rydin, E. (2006). Biogenic phosphorus in oligotropic mountain lake sediments: Differences in composition measured with NMR spectroscopy. Water Research (40), 3705-3712
Open this publication in new window or tab >>Biogenic phosphorus in oligotropic mountain lake sediments: Differences in composition measured with NMR spectroscopy
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2006 (English)In: Water Research, no 40, p. 3705-3712Article in journal (Refereed) Published
Keywords
Phosphorus species, 31P-NMR spectroscopy, Reservoirs, Oligotrophication, Method validation, 31P-NMR accuracy
National Category
Analytical Chemistry Organic Chemistry Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-18049 (URN)doi:10.1016/j.watres.2006.09.006 (DOI)
Available from: 2006-11-20 Created: 2006-11-20 Last updated: 2011-01-11
Reitzel, K., Ahlgren, J., Gogoll, A., Jensen, H. & Rydin, E. (2006). Characterization of phosphorus in sequential extracts from lake sediments using P-31 nuclear magnetic resonance spectroscopy. Canadian Journal of Fisheries and Aquatic Sciences, 63(8), 1686-1699
Open this publication in new window or tab >>Characterization of phosphorus in sequential extracts from lake sediments using P-31 nuclear magnetic resonance spectroscopy
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2006 (English)In: Canadian Journal of Fisheries and Aquatic Sciences, ISSN 0706-652X, E-ISSN 1205-7533, Vol. 63, no 8, p. 1686-1699Article in journal (Refereed) Published
Abstract [en]

Phosphorus (P) compounds in three different lake surface sediments were extracted by sequential P extraction and identified by P-31 nuclear magnetic resonance (P-31 NMR) spectroscopy. The extraction procedure primarily discriminates between inorganic P-binding sites but most extraction steps also contained P not reacting (nrP) with the molybdenum complex during P analyses. In all three lakes, the nrP dominated in the NaOH extracts. Nonreactive P from the dystrophic lake was dominated by potentially recalcitrant P groups such as orthophosphate monoesters, while the nrP in the two more productive lakes also contained polyphosphates, pyrophosphate, and organic P groups such as P lipids and DNA-P that may be important in remineralization and recycling to the water column. In addition, polyphosphates showed substantial dynamics in settling seston. The Humic-P pools (P associated with humic acids) showed strong signals of orthophosphate monoesters in all three lakes, which supported the assumption that P-containing humic compounds are indeed recovered in this fraction, although other organic P forms are also present. Thus, in addition to expanding the understanding of which organic P forms that are present in lake sediments, the P-31 NMR technique also demonstrated that the chemical extraction procedure may provide some quantification of recalcitrant versus labile organic P forms.

National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-94213 (URN)10.1139/F06-070 (DOI)000239655100003 ()
Available from: 2006-03-31 Created: 2006-03-31 Last updated: 2017-12-14Bibliographically approved
Reitzel, K., Ahlgren, J., Gogoll, A. & Rydin, E. (2006). Effects of aluminum treatment on phosphorus, carbon, and nitrogen distribution in lake sediment: A 31P NMR study. Water Research (40), 647-654
Open this publication in new window or tab >>Effects of aluminum treatment on phosphorus, carbon, and nitrogen distribution in lake sediment: A 31P NMR study
2006 (English)In: Water Research, no 40, p. 647-654Article in journal (Refereed) Published
Abstract [en]

The effects of aluminum (A1) treatment on sediment composition of carbon (C), nitrogen (N) and phosphorus (P) were investigated in sediment representing pre- and post-treatment years in the Danish Lake Sönderby. 31P NMR spectroscopy analysis of EDTA-NaOH extracts revealed six functional P groups. Direct effects of the A1 treatment were reflected in the othophosphate profile revealing increased amounts of A1-P in the sediment layers representing the post-treatment period, as well as changes in organic P groups due to precipitation of phytoplankton and bacteria at the time of A1 additon. Furthermore, changes in phytoplankton community structure and lowered production due to the A1 treatment resulted in decreased concentrations of sediment organic P groups and total C. Exponential regressions were used to describe the diagensisi of C, N, and P in the sediment. From these regressions , half-life degradation times and C, N, and P burial rates were determined.

National Category
Analytical Chemistry Organic Chemistry
Identifiers
urn:nbn:se:uu:diva-83635 (URN)doi:10.1016/j.watres.2005.12.014 (DOI)
Available from: 2006-11-09 Created: 2006-11-09 Last updated: 2011-01-11
Ahlgren, J., Tranvik, L., Gogoll, A., Waldebäck, M., Markides, K. & Rydin, E. (2005). Sediment Depth Attenuation of Biogenic Phosphorus Compounds Measured by 31P NMR. Environmental Science and Technology, 39(3), 867-872
Open this publication in new window or tab >>Sediment Depth Attenuation of Biogenic Phosphorus Compounds Measured by 31P NMR
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2005 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 39, no 3, p. 867-872Article 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.

National Category
Analytical Chemistry Organic Chemistry Ecology
Identifiers
urn:nbn:se:uu:diva-83615 (URN)10.1021/es049590h (DOI)000226712600036 ()15757351 (PubMedID)
Available from: 2007-01-29 Created: 2007-01-29 Last updated: 2017-12-14Bibliographically approved
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