Forms of phosphorus in particulate matter from the Hollands Diep/Haringvliet, The Netherlands

Eck, G.Th.M. van

doi:10.1007/978-94-009-8009-9_66

Cited by 22 publications

(21 citation statements)

References 29 publications

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“…In nature, Fe/P molar ratios of 5-10 have been indicated for sediments (Williams et al,. 1971), whereas amorphous Fe-P precipitates with extremely low molar ratios (1.5) have been indicated in the Rhine estuary (van Eck, 1982). This may be an optimal case for the formation of precipitates, however.…”

Section: Phosphorus In Precipitatesmentioning

confidence: 99%

“…In practice, grain sizes large enough for analysis may only be obtained in running water. In the turbid Rhine estuary the size of crystalline grains was too small for x-ray diffraction analysis (van Eck, 1982). The quantification of minerals has therefore generally been confined to group specific extraction procedures such as those for precipitates and coprecipitates (cf.…”

Section: Phosphorus In Mineralsmentioning

confidence: 99%

“…Other mild extraction techniques possibly simulating algal availability are desorption by anion exchangers (Cowen & Lee, 1976;Shukla et al, 1980), desorption by added NaCl (van Eck, 1980;Li, 1973) and the desorption by high voltage electrodialysis (Nemeth, 1972;van Eck, 1982).…”

Section: Extraction Of Inorganic Phosphorus Formsmentioning

confidence: 99%

“…Such fractions have been isolated by size or sedimentation fractionation (Dong et al, 1983;Viner, 1982;van Eck, 1982). The higher phosphorus content of lighter fractions is exemplified by fractionation of non-permanent river bed material into fractions of different sedimentation rates which are characterized using a Coulter Counter (Fig.…”

Section: Physical Separationmentioning

confidence: 99%

“…The extraction scheme proposed by Hieltjes & Lijklema (1980), which has been successfully applied to sediment chemistry (Bostrbm et al, 1988a), has to date only been applied to a study of the estuarine suspended matter (van Eck, 1982). The content of NaOH-extractable DRP was shown to be exceptionally high and apatite and extractable organic phosphorus correspondingly low.…”

Section: Chemical Separationmentioning

confidence: 99%

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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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Section: Phosphorus In Precipitatesmentioning

confidence: 99%

Section: Phosphorus In Mineralsmentioning

confidence: 99%

Section: Extraction Of Inorganic Phosphorus Formsmentioning

confidence: 99%

Section: Physical Separationmentioning

confidence: 99%

Section: Chemical Separationmentioning

confidence: 99%

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Particulate and dissolved phosphorus forms in freshwater: composition and analysis

Broberg

Persson

1988

Hydrobiologia

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Benthic hotspots in the pelagic zone: Light and phosphate availability alter aggregates of microalgae and suspended particles in a shallow turbid lake

Brinkmann

Vonk

Beusekom

et al. 2018

Limnology & Oceanography

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Limnetic aggregates from a turbid delta lake with low dissolved nutrient availability were studied in relation to light and dissolved nutrient availability. Quick light‐attenuation restricts the euphotic zone to the top surface layer of the water column, whereas mineralization processes in the sediment specifically provide dissolved nutrients near the lakebed. This suggests neither the pelagic nor the benthic zone provides the combination of resources required for microalgal growth. Nutrient mineralization in aggregates could bridge this apparent spatial gap in light and nutrients by providing dissolved nutrients in the euphotic zone, promoting microalgal growth. To explore this, aggregates obtained from turbid and phosphate‐limited lake Markermeer (The Netherlands) were exposed in the laboratory to phosphate‐replete and phosphate depleted conditions, at high‐light and low‐light availability. Confocal microscopy revealed that aggregates exhibited alkaline phosphatase activity and contained microalgae, other microbes, and extracellular polymeric substances. The spatial distribution of the phosphatase activity in aggregates largely matched that of chlorophyll a (Chl a)‐lacking microbes, suggesting that these microbes were responsible for the activity. Colorimetric quantification revealed that aggregates exhibited over 1.9‐fold higher phosphatase activity than surrounding water. Two‐day exposure to different light and phosphate availabilities affected aggregate composition. Phosphate depleted conditions resulted in more Chl a‐lacking microbes and more phosphatase activity than phosphate‐replete conditions. Low‐light intensity resulted in higher abundance of extracellular polymeric substances than high‐light intensity. In contrast to aggregates from deep stratified systems, Markermeer aggregates were not enriched with dissolved phosphorus. These results suggest that P‐cycling in aggregates differs between shallow turbid and deep stratified ecosystems.

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Phosphate fractionation in mud bank sediments from the southwest coast of India

1993

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Mud banks are unique, occurring along the southwest coast of India. They are known as 'Zones of Bio-rhythm', providing shelter to abundant aquatic life. The cyclic variation of nutrients in this region provides a clue to the continued and enriched presence of a variety of fish. This study reports on the different forms of phosphate in the resuspended sediments collected during the seasons with and without mud banks from the above mentioned coastal zones. Applying sequential and parallel chemical extractions using eight different schemes, the major forms of phosphate namely exchangeable P, anion exchangeable P, carbonate bound P, labile and resistant organic P, Fe-, Al-and Ca bound P and hydrolysable P have been determined.Quantitatively, these fractions vary and exhibit seasonal fluctuations. The concentration of potentially available anion exchange P, together with resistant organic and hydrolysable surplus P, provide an explanation to the existing organic food web supporting the aquatic life. Sediment phosphate fractionation reflects the role of chemical speciation of nutrients in the propagation of mud banks and is indicative of the biogenic processes controlling the pathways of phosphate in these coastal waters.Abbreviations: the abbreviations used are the editor's proposal (see page vi of this issue). Furthermore: CO 3 -P = carbonate bound phosphate surplus-P = acid extractable phosphate

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Forms of phosphorus in particulate matter from the Hollands Diep/Haringvliet, The Netherlands

Cited by 22 publications

References 29 publications

Particulate and dissolved phosphorus forms in freshwater: composition and analysis

Particulate and dissolved phosphorus forms in freshwater: composition and analysis

Benthic hotspots in the pelagic zone: Light and phosphate availability alter aggregates of microalgae and suspended particles in a shallow turbid lake

Phosphate fractionation in mud bank sediments from the southwest coast of India

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