Bioavailability of Different Phosphorus Forms in Freshwater Systems

Boström, Bengt; Persson, Gunnar; Broberg, Brita

doi:10.1007/978-94-009-3109-1_9

Cited by 98 publications

(89 citation statements)

References 53 publications

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“…The separation of algae and particles may prevent P mobilization induced by the algal surface-bound enzymes (Williams et al, 1980;Hegeman & Keenan, 1985;Bostrom et al, 1988). This hypothesis is supported by the fact that usually the highest bioavailability values have been reported in studies in which algae and particles have been mixed (e.g.…”

Section: Efect Of the Separation Of Algae And Particlessupporting

confidence: 60%

“…However, it is known that the DRP determination may strongly overestimate the orthophosphate, and on the other hand that organic P compounds of the DUP pool may be utilized by the algae (e.g. Bostrom et al, 1988). According to the bioassay results it appeared that the DRP in the rivers studied is readily available to algae.…”

Section: Bioavailability Of Dissolved Pmentioning

confidence: 89%

“…Williams et al, 1980;Bostrdm et al, 1988). Furthermore, the ability of different algal species to utilize various P compounds may vary (Bostrom et al, 1988;Persson, 1990).…”

Section: Bioavailability Of Dissolved Pmentioning

confidence: 99%

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Bioavailability of phosphorus in agriculturally loaded rivers in southern Finland

Ekholm¹

1994

Hydrobiologia

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The potential bioavailability of phosphorus in agriculturally loaded rivers of southern Finland was determined by an algal bioassay and the release of the potentially bioavailable particulate P was estimated by sorption studies. According to the bioassay 0 to 13.2 per cent (mean 5.1%) of the particulate P in river water samples was potentially bioavailable. Dissolved reactive P (DRP) in river waters appeared to be totally bioavailable whereas the dissolved unreactive P appeared not to be utilized by algae. In addition to river waters two lake sediment samples were also assayed. In these samples 0 and 2.6% of the P was bioavailable. The potential bioavailability of particulate P in agriculturally loaded rivers obtained in this study was lower than that reported in studies from other countries. The difference was assumed to arise partly from methodological factors and partly from the nature of the Finnish soils. The EPC (equilibrium phosphate concentration) values indicated that during the period when most of the agricultural loading enters the lakes in Finland, potentially bioavailable P is not released from the particles because of the relatively high DRP concentration in the receiving waters. However, during the algal production period the DRP concentration in lakes decreases below the EPC and potentially bioavailable particulate P is desorbed. The increase in pH during this period may further enhance the desorption of P.

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Section: Efect Of the Separation Of Algae And Particlessupporting

confidence: 60%

Section: Bioavailability Of Dissolved Pmentioning

confidence: 89%

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Bioavailability of phosphorus in agriculturally loaded rivers in southern Finland

Ekholm¹

1994

Hydrobiologia

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“…In addition, part of the colloidal and non-orthophosphate compounds may occur in the DRP fraction. Furthermore DRP is a variable predictor both of immediately bioavailable and potentially bioavailable filterable phosphorus (Bostriim et al, 1988b). Therefore there are reasons to abandon the traditional analytical scheme.…”

Section: Discussionmentioning

confidence: 99%

Particulate and dissolved phosphorus forms in freshwater: composition and analysis

Broberg

Persson

1988

Hydrobiologia

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In recent research, particulate and dissolved phosphorus components have been separated and characterized on the basis of their physical and chemical properties and partly by their origins.Classical operationally defined monitoring variables (dissolved reactive phosphorus, dissolved unreactive phosphorus and particulate phosphorus) are not congruent with known specific physical or chemical components of phosphorus in natural waters or with their bioavailability.Physical isolation of true particles, colloids and molecules of various sizes is possible at present although it is not recommended for routine use.Chemical characterization of particulate phosphorus is performed mainly by sediment extraction procedures (specialized for inorganic species) and -to a lesser degree -by cell extraction procedures (specialized for organic compounds). The extraction procedures are similar and physical preseparation or alternative procedures (e.g. enzymatic assays) are essential.Smaller colloids and dissolved compounds are physically separated by column chromatography and are often chemically characterized by degradation on the addition of specific enzymes.

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“…Increased pH in the water in contact with the sediment decreases the P-binding capacity of iron and aluminium compounds, primarily due to ligand exchange reactions in which hydroxide ions replace orthophosphate (Lijklema, 1977;Bostrdm et al, 1982). pH may also have an important secondary effect on phosphorus release from lake sediments: If iron (II) and orthophosphate are released from an anaerobic sediment surface and mixed into aerobic lake water with a high pH, only part of the released phosphorus will be bound to the reprecipitated iron (III) compounds (Bostriim et al, 1988).…”

Section: Mobilization Processesmentioning

confidence: 99%

Exchange of phosphorus across the sediment-water interface

Andersen²,

et al. 1988

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In this article, principles of phosphorus retention and phosphorus release at the sediment-water interface in lakes are reviewed. New results and hypotheses are discussed in relation to older models of phosphorus exchange between sediments and water. The fractional composition of sedimentary phosphorus is discussed as a tool for interpretation of different retention mechanisms. Special emphasis is given to the impact ofbiological, particularly microbial, processes on phosphorus exchange across the sediment-water interface and to the significance of biologically induced CaCO, precipitation to phosphorus retention in calcareous lakes,

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Bioavailability of Different Phosphorus Forms in Freshwater Systems

Cited by 98 publications

References 53 publications

Bioavailability of phosphorus in agriculturally loaded rivers in southern Finland

Bioavailability of phosphorus in agriculturally loaded rivers in southern Finland

Particulate and dissolved phosphorus forms in freshwater: composition and analysis

Exchange of phosphorus across the sediment-water interface

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