Concentration, fractionation and characterisation of soluble organic phosphorus in river water entering lough neagh

Stevens, Robert

doi:10.1016/0043-1354(82)90202-0

Cited by 52 publications

(20 citation statements)

References 30 publications

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“…17 kg ha 71 yr 71 and accounted for only c. 3±9% and 5±38% of the TP and TDP loads, respectively. These proportions are similar to those reported previously for other rivers in Europe and the USA (Johnson et al, 1976;Stevens and Stewart, 1982a;Svendsen et al, 1995). Comparison of the yields from the study basins suggests that DOP is not directly in¯uenced by point source inputs, since the greatest yield was recorded for the River Dart and the smallest for the River Avon.…”

Section: Annual Nutrient Loadssupporting

confidence: 79%

“…Although it is often ignored, the DOP fraction may represent an important component of the TDP load. Stevens and Stewart (1982a) found that 7±29% of this fraction is bioavailable, since phytoplankton can utilize both inorganic and organic forms of TDP (Cotner and Wetzel, 1992).…”

Section: Annual Nutrient Loadsmentioning

confidence: 98%

“…Brooker and Johnson, 1984;Karlsson et al, 1988;Foy et al, 1995), but recent investigations have emphasized the potential importance of other dissolved (e.g. Stevens and Stewart, 1982a;Heathwaite and Johnes, 1996;Foster et al, 1997) and sediment-associated (e.g. Kronvang, 1992;Abrams and Jarrell, 1995;Walling et al, 1997) fractions.…”

Section: Introductionmentioning

confidence: 97%

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The composition of nutrient fluxes from contrasting UK river basins

et al. 1998

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Abstract:Accurate estimates of N and P loads were obtained for four contrasting UK river basins over a complete annual cycle. The fractionation of these loads into dissolved and particulate, and inorganic and organic components allowed a detailed examination of the nutrient load composition and of the factors in¯uencing both the relative and absolute magnitude of these components. The particulate phosphorus (TPP) loads account for 26±75% of the annual total phosphorus (TP) transport and are predominantly inorganic. The inorganic (PIP) and organic (POP) fractions of the TPP loads represent 20±47% and 6±28% of the annual TP transport, respectively. In contrast, the particulate nitrogen loads (TPN) represent 8% or less of the annual total nitrogen (TN) loads and are predominately organic. For dissolved P transport, the dissolved inorganic fraction (DIP) is more important, representing 15±70% of the TP loads, whereas the dissolved organic fraction (DOP) represents only 3±9% of the TP loads. The TN loads are dominated by the dissolved component and more particularly the total oxidized fraction (TON), which is composed of nitrate and nitrite and represents 76±82% of the annual TN transport. The remaining dissolved N species, ammonium (NH 4 -N) and organic N (DON) account for 0 . 3±1 . 2% and 13±16% of the annual TN transport, respectively. The TPN and TPP¯uxes closely re¯ect the suspended sediment dynamics of the study basins, which are in turn controlled by basin size and morphology. The dissolved inorganic nutrient¯uxes are in¯uenced by point source inputs to the study basins, especially for P, although the TON¯ux is primarily in¯uenced by diuse source contributions and the hydrological connectivity between the river and its catchment area. The dissolved organic fractions are closely related to the dissolved organic carbon (DOC) dynamics, which are in turn in¯uenced by land use and basin size. The magnitude of the NH 4 -N fraction was dependent on the proximity of the monitoring station to point source discharges, because of rapid nitri®cation within the water column. However, during storm events, desorption from suspended sediment may be temporarily important. Both the magnitude and relative contribution of the dierent nutrient fractions exhibit signi®cant seasonal variability in response to the hydrological regime, sediment mobilization, the degree of dilution of point source inputs and biological processes. #

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Section: Annual Nutrient Loadssupporting

confidence: 79%

Section: Annual Nutrient Loadsmentioning

confidence: 98%

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The composition of nutrient fluxes from contrasting UK river basins

et al. 1998

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“…Phytate can be detected in preconcentrated lake waters (Eisenreich and Armstrong, 1977), river waters (Stevens and Stewart, 1982), marine waters (Matsuda et al, 1985), lake sediments (Golterman et al, 1998) and marine sediments (Suzumura and Kamatani, 1995b). In addition, it constitutes approximately 20% of total organic P in soil leachates (Toor et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Distribution and diversity of phytate-mineralizing bacteria

et al. 2007

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Phytate, the most abundant organic phosphorus compound in soil, dominates the biotic phosphorus input from terrestrial runoffs into aquatic systems. Microbial mineralization of phytate by phytases is a key process for recycling phosphorus in the biosphere. Bioinformatic studies were carried out on microbial genomes and environmental metagenomes in the NCBI and the CAMERA databases to determine the distribution of the four known classes of phytase in the microbial world. The b-propeller phytase is the only phytase family that can be found in aquatic environments and it is also distributed in soil and plant bacteria. The b-propeller phytase-like genes can be classified into several subgroups based on their domain structure and the positions of their conserved cysteine residues. Analysis of the genetic contexts of these subgroups showed that b-propeller phytase genes exist either as an independent gene or are closely associated with a TonB-dependent receptor-like gene in operons, suggesting that these two genes are functionally linked and thus may play an important role in the cycles of phosphorus and iron. Our work suggests that b-propeller phytases play a major role in phytate-phosphorus cycling in both soil and aquatic microbial communities.

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“…The main component of alkali-OP is humic substances (Golterman 2001). P associated with humic acids has been considered either to be an integral part of humic acids or as a phosphate/metal/organic matter complex (Stevens and Stewart 1982). This fraction may to some unknown extent contain phytate, an organic phosphate that is common in plants and sediments (De Groot and Golterman 1993;Dvorakova 1998).…”

Section: Discussionmentioning

confidence: 99%

Fractionation and bioavailability of phosphorus in a tropical estuary, Southwest India

Renjith

Chandramohanakumar

Joseph

2010

Environ Monit Assess

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Phosphorus fractionation was employed to find the bioavailability of phosphorus and its seasonal variations in the Panangad region of Cochin estuary, the largest estuarine system in the southwest coast of India. Sequential extraction of the surficial sediments using chelating agents was taken as a tool for this. Phosphate in the water column showed seasonal variations, with high values during the monsoon months, suggesting external runoff. Sediment texture was found to be the main factor influencing the spatial distribution of the geochemical parameters in the study region. Similarly, total phosphorus also showed granulometric dependence and it ranged between 319.54 and 2,938.83 μg/g. Calcium-bound fraction was the main phosphorus pool in the estuary. Significant spatial variations were observed for all bioavailable fractions; iron-bound inorganic phosphorus (5.04-474.24 μg/g), calcium-bound inorganic phosphorus (11.16-826.09 μg/g), and acidsoluble organic phosphorus (22.22-365.86 μg/g). Among the non-bioavailable phosphorus, alkalisoluble organic fraction was the major one (51.92-1,002.45 μg/g). Residual organic phosphorus was K. R. Renjith (B) · N. Chandramohanakumar · M. M. Joseph Department of Chemical Oceanography, School of Marine Sciences, Cochin University of Science and Technology, Kochi 682016, Kerala, India e-mail: renjithaqua@gmail.com comparatively smaller fraction (3.25-14.64% of total). The sandy and muddy stations showed distinct fractional composition and the speciation study could endorse the overall geochemical character. There could be buffering of phosphorus, suggested by the increase in the percentage of bioavailable fractions during the lean premonsoon period, counteracting the decreases in the external loads. Principal component analysis was employed to find the possible processes influencing the speciation of phosphorus in the study region.

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Concentration, fractionation and characterisation of soluble organic phosphorus in river water entering lough neagh

Cited by 52 publications

References 30 publications

The composition of nutrient fluxes from contrasting UK river basins

The composition of nutrient fluxes from contrasting UK river basins

Distribution and diversity of phytate-mineralizing bacteria

Fractionation and bioavailability of phosphorus in a tropical estuary, Southwest India

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