Identification of Different Phosphorus Forms and their Role in the Eutrophication Process of Lake Balaton

Dobolyi, Elemér

doi:10.1007/978-94-009-9203-0_2

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…) further concluded that the condensed phosphates with higher polymerization degrees, were formed in the lake itself and primarily originated from metabolic activity of algae. The separation characteristics found by Dobolyi (1980) are in good agreement with those found in laboratory studies for different polyphosphates. Separation of dissolved phosphorus compounds seldom results in a clear distinction between inorganic and organic phosphorus forms.…”

Section: Analysis and Ident$cation Of Dipsupporting

confidence: 79%

“…The fractions recorded by Francko & Heath (1979) and Francko (1984) imply several similarities with the polyphosphates recorded by Dobolyi (1980) in Lake Balaton. However, the presentations of Francko & Heath (1979) and Francko (1984) do not permit an easy comparison with the gel chromatography characteristics listed by Dobolyi (1980).…”

mentioning

confidence: 63%

“…Hooper (1969) found that 1.7-12.3x of the total phosphorus in a bog lake was 'labile' (hydrolysable) inorganic phosphorus, presumably polyphosphates and/or pyrophosphate. Dobolyi (1980) isolated several polyphosphates by Sephadex chromatography (G-25) in samples from Lake Balaton and its tributaries (ranging from ortho-and pyrophosphate to polyphosphates with polymerization degrees up to 10). Dobolyi (op.…”

Section: Analysis and Ident$cation Of Dipmentioning

confidence: 99%

“…However, the presentations of Francko & Heath (1979) and Francko (1984) do not permit an easy comparison with the gel chromatography characteristics listed by Dobolyi (1980). The hypothesis that polyphosphates rather than phosphomonoesters could be the isolated IMWP fractions in the Twin Lakes is primarily based on the findings that these fractions did not degrade when exposed to UV radiation but readily decomposed when treated with alkaline phosphatases.…”

mentioning

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: Analysis and Ident$cation Of Dipsupporting

confidence: 79%

mentioning

confidence: 63%

Section: Analysis and Ident$cation Of Dipmentioning

confidence: 99%

mentioning

confidence: 99%

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Particulate and dissolved phosphorus forms in freshwater: composition and analysis

Broberg

Persson

1988

Hydrobiologia

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“…The presence of condensed phosphates has been evidenced by chromatographic methods (Dobolyi, 1980) and the presence of dissolved organic Fe/Al-phosphate complexes has also been indicated (Jackson & Schindler, 1975;Koenings & Hooper, 1976).…”

Section: Identijication and Characterization Of Bioavailable Dissolvementioning

confidence: 99%

Bioavailability of different phosphorus forms in freshwater systems

Boström

Persson²,

Broberg³

1988

Hydrobiologia

196

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The recent literature on the bioavailability of different forms of P in freshwater systems is reviewed. Bioavailable P is defined as the sum of immediately available P and the P that can be transformed into an available form by naturally occurring processes. Methods used to estimate the bioavailable P pool, which vary between studies largely depending on the time perspective applied, are critically evaluated. Most studies on particulate P aim to determine the potentially available P pool. Potential bioavailability of particulate P is normally analysed in bioassays with algal yield determinations and the available P fraction is characterized from interpretations of results of sequential chemical extractions. NaOHextractable P is in most studies the most algal-available P fraction. For soil samples and 'tributary water particulate matter, NaOH-P has often been found to be equal to algal extractable P. In other studies depletions of NaOH-P have accounted for the algal P uptake, but only a minor proportion of the fraction has been utilized. Organic P in lake water particulate matter and bed sediments of eutrophic lakes can also be algal-available to a significant extent.Studies on the bioavailability of dissolved P have often been concerned with immediate availability, or the minimum amount of available P. Such studies need other types of experimental design and normally assays with radiotracers are used. Immediately available P is frequently found to be less than P chemically assessed as dissolved reactive P (DRP) at low (< 10 pg DRP * l-') concentrations. However, immediate availability may also approach or exceed DRP concentrations, especially at higher concentrations. Potential bioavailability, assayed as for particulate P, may generally render higher bioavailability than P assayed as immediately available. Large fractions of dissolved P remain unutilized and are primarily found in the high molecular weight fraction of dissolved P. Introductionthe total P load on lakes will be available to the lake biota for production of organic matter. In Empirical relations between phosphorus loading, recent years increased attention has therefore phosphorus concentrations and algal biomasses been paid to determinations of the bioavailable or in lakes are normally based on total phosphorus, algal-available proportion of P from different cf. the OECD report on eutrophication of waters sources, with the aim of improving understanding (OECD, 1982). However, it is well known, and of P cycling in lakes, refining empirical models or also stated in the OCED report, than only part of improving lake management strategies.

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Nutrient Requirement and Growth of a Synechococcus Species Isolated from Lake Balaton

Mastala

Herodek

Balogh

et al. 1996

Intl Review of Hydrobiology

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A pic0 sized Synecho<:occiis species isolated from Lake Balaton was studied in batch and continuous cultures. This picocyanobacterium had a pH optimum at 8.5 and a tenipmiture optimum at 28-30 "c.The IL value for growth was 52 pEinstein m-'S-', the maximum growth rate 2.27 d-I, the half saturation Constant of growth 1.2 pg PO,-P I-' and the minimal cell quota 1.74 nig P g dry weight-'. The dry weight of cells showed a minimum, the chlorophyll-ulbiomass ratio ;I maximum as a function of growth rate. Above the quota of 3.4 fg P Cell-' significant amounts of non-reactive dissolved PhosphorLls were released.

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Identification of Different Phosphorus Forms and their Role in the Eutrophication Process of Lake Balaton

Cited by 8 publications

References 10 publications

Particulate and dissolved phosphorus forms in freshwater: composition and analysis

Particulate and dissolved phosphorus forms in freshwater: composition and analysis

Bioavailability of different phosphorus forms in freshwater systems

Nutrient Requirement and Growth of a Synechococcus Species Isolated from Lake Balaton

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