Degradation of organic phosphorus compounds in anoxic Baltic Sea sediments: A 31P nuclear magnetic resonance study

Ahlgren, Joakim; Reitzel, Kasper; Tranvik, Lars J.; Gogoll, Adolf; Rydin, Emil

doi:10.4319/lo.2006.51.5.2341

Cited by 70 publications

(70 citation statements)

References 22 publications

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“…The procedure is assumed to quantitatively recover organic phosphorus, including phytate, from soil and we assumed this would also be the case for aquatic sediment. The technique has been used widely in recent years to extract organic phosphorus from a range of freshwater, brackish, and marine sediments (Ahlgren et al 2006;Cade-Menun et al 2005;Carman et al 2000;Hupfer et al 1995Hupfer et al , 2004Turner et al 2006). …”

Section: Methodsmentioning

confidence: 99%

Phytate as a novel phosphorus-specific paleo-indicator in aquatic sediments

Turner

Weckström

2008

J Paleolimnol

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A reliable geochemical paleo-indicator for phosphorus remains elusive, despite the importance of understanding historical changes in the nutrient status of aquatic ecosystems. We assessed the potential of phytate (salts of mvo-inositol hexakisphosphate) as a novel phosphorus-specific paleoindicator by measuring its concentrations in dated sediments from an embayment in Helsinki, Finland, with a known 200-year history of trophic changes. Phytate was extracted in a solution containing sodium hydroxide and EDTA and detected by solution : P NMR spectroscopy with spectral deconvolution. Concentrations varied markedly with sediment depth and paralleled previously determined changes in diatom assemblages and geochemical indicators linked to trophic status. In contrast, total sediment phosphorus did not reflect phosphorus inputs to the embayment, presumably due to the mobilization of inorganic phosphate under anoxic conditions during

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Section: Methodsmentioning

confidence: 99%

Phytate as a novel phosphorus-specific paleo-indicator in aquatic sediments

Turner

Weckström

2008

J Paleolimnol

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“…In a study of sediment P speciation in a Swedish Lake, DNA concentrations did not reach a minimum asymptotic concentration with depth, indicating that it was still being hydrolysed. [26] Ahlgren et al [47] estimated the half-life of DNA in sediments of the Baltic Sea to be ,8.5 years whereas Dell'Anno and Danovaro [48] estimated the residence time of DNA in deep ocean sediments was ,9.5 years compared to 40þ years for organic P in general.…”

Section: Quantificationmentioning

confidence: 99%

Organic phosphorus in the aquatic environment

Baldwin¹

2013

Environ. Chem.

104

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Environmental context. Organic phosphorus can be one of the major fractions of phosphorus in many aquatic ecosystems. This paper discusses the distribution, cycling and ecological significance of five major classes of organic P in the aquatic environment and discusses several principles to guide organic P research into the future.Abstract. Organic phosphorus can be one of the major fractions of phosphorus in many aquatic ecosystems. Unfortunately, in many studies the 'organic' P fraction is operationally defined. However, there are an increasing number of studies where the organic P species have been structurally characterised -in part because of the adoption of 31 P NMR spectroscopic techniques. There are five classes of organic P species that have been specifically identified in the aquatic environment -nucleic acids, other nucleotides, inositol phosphates, phospholipids and phosphonates. This paper explores the identification, quantification, biogeochemical cycling and ecological significance of these organic P compounds. Based on this analysis, the paper then identifies a number of principles which could guide the research of organic P into the future. There is an ongoing need to develop methods for quickly and accurately identifying and quantifying organic P species in the environment. The types of ecosystems in which organic P dynamics are studied needs to be expanded; flowing waters, floodplains and small wetlands are currently all under-represented in the literature. While enzymatic hydrolysis is an important transformation pathway for the breakdown of organic P, more effort needs to be directed towards studying other potential transformation pathways. Similarly effort should be directed to estimating the rates of transformations, not simply reporting on the concentrations. And finally, further work is needed in elucidating other roles of organic P in the environment other than simply a source of P to aquatic organisms.

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“…The eight P compounds included phosphonates, orthophosphate, orthophosphate monoesters, pyrophosphates, polyphosphates, and three different compounds in the orthophosphate diester region. The latter compounds were suggested by Ahlgren et al (2006) and others to be DNA P (À0.83 ppm), microbial P lipids (from 2.66 to À0.15 ppm) and teichoic acid P (2.97 ppm). The total extracted P using NaOH þ EDTA was compared to the extracted TP using aqua regia and the difference is referred to as extraction efficiency.…”

Section: P Nmr Analysismentioning

confidence: 99%

“…Spectra were processed with a 10-Hz exponential line broadening by using Mestre-C software (V. 2.3a, Santiago de Compostela, Spain). Peak areas were calculated by integration on processed spectra and, subsequently, grouped into distinct P compounds (orthophosphate, pyrophosphate and polyphosphate) or compound classes (orthophosphate monoesters and diesters and phosphonates) by using peak assignments derived from the literature (CadeMenun 2005; Hupfer et al 2004;Ahlgren et al 2006). Peak assignments (chemical shifts) to identify P compounds and compound classes were 19.58 ppm for phosphonates, 6.68-5.20 ppm for orthophosphate, 5.21-3.37 ppm for orthophosphate monoesters, 3.34 to À3.43 ppm for orthophosphate diesters, À3.87 to À4.97 ppm for pyrophosphates, and À18.85 to À21.67 ppm for polyphosphates.…”

Section: P Nmr Analysismentioning

confidence: 99%

“…Lake sediment studies have identified several classes of organic P compounds similar to those found in terrestrial soils, including orthophosphate monoesters, orthophosphate diesters and polyphosphates. The relative proportion of these compounds varies, however, suggesting variations among sediment types and prevailing environmental conditions (Hupfer et al 1995;Ahlgren et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus dynamics in sediments of a eutrophic lake derived from 31P nuclear magnetic resonance spectroscopy

Özkundakci¹,

Hamilton²,

McDowell³

et al. 2014

Mar. Freshwater Res.

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Abstract. The determination of organic phosphorus (P) compounds in lake sediments can provide information on the potential for internal P loading. Settling seston and vertical sediment core samples from highly eutrophic Lake Okaro, New Zealand, were collected during a mixed winter and stratified summer period, representing, respectively, when the water column was well oxygenated and when the bottom waters were anoxic. Samples were analysed with 31 P nuclear magnetic resonance ( 31 P NMR) spectroscopy, which showed that both bottom sediments and settling seston contained orthophosphate, orthophosphate monoesters and diesters, pyrophosphates, polyphosphates and phosphonates. Phosphorus concentration in settling seston increased ,2.5-fold in winter as a result of seasonally induced changes in phytoplankton biomass, with a marked increase in the concentration of orthophosphate. Several potentially bioavailable P compounds in the bottom sediments were identified that were likely to contribute to recycling of P from the sediment to the water column. An 'apparent half-life' was used to quantify the time scales on which these compounds were recycled to the overlying water column. Orthophosphate monoesters that include inositol phosphates were the most persistent P compound. On the basis of half-lives, high internal P loadings may persist for more than 20 years, potentially hindering restoration efforts in Lake Okaro.

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Degradation of organic phosphorus compounds in anoxic Baltic Sea sediments: A 31P nuclear magnetic resonance study

Cited by 70 publications

References 22 publications

Phytate as a novel phosphorus-specific paleo-indicator in aquatic sediments

Phytate as a novel phosphorus-specific paleo-indicator in aquatic sediments

Organic phosphorus in the aquatic environment

Phosphorus dynamics in sediments of a eutrophic lake derived from 31P nuclear magnetic resonance spectroscopy

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