Effects of dissolved humic substances on the speciation of iron and phosphate at different pH and ionic strength

Jones, Roger; Shaw, Peter J.; Haan, H. De

doi:10.1021/es00043a003

Cited by 84 publications

(47 citation statements)

References 12 publications

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“…Thus, we postulate that the orthophosphate found in base extracts is actually bound to macromolecular humic compounds (e.g., by metal bridges), a mechanism for immobilization of orthophosphate that has been widely described in the soil science and limnologicalliterature (e.g., Levesque & Schnitzer, 1967;Koenings & Hooper, 1976;Francko & Heath, 1982;Gerke, 1992;Jones et al, 1993;Frossard et al, 1995).…”

Section: The Origin Of Orthophosphate In the Base Extractable Reservoirmentioning

confidence: 91%

“…The formation of metal bridges between orthophosphate and humic compounds, described extensively in the limnological and soil science literature (e.g., Levesque & Schnitzer, 1967;Koenings & Hooper, 1976;Francko & Heath, 1982;Gerke, 1992;Jones et al, 1993;Frossard et al, 1995), may result in inaccessibility of orthophosphate to simple acid extraction, and overestimation of the organic P pool. Such an analytical artifact could potentially lead to a large overestimation of the total organic P buried and ultimately preserved in marine sediments.…”

Section: Analytical Artifact: Overestimation Ofp Mg ?mentioning

confidence: 99%

“…Based on these constraints, a plausible explanation for the high orthophosphate concentration in the base-extractable fraction is metal bridging between orthophosphate and large organic molecules. Metal bridging has been widely suggested as a mechanism for P incorporation into humic compounds in lakes and terrestrial soils (e.g., Levesque & Schnitzer, 1967;Koenings & Hooper, 1976;Francko & Heath, 1982;Gerke, 1992;Jones et al, 1993;Frossard et al, 1995). The fact that the observed peaks in the NMR spectrum are so sharp indicates that no significant quantities of paramagnetic metals (such as Fe l +) are likely to be present.…”

Section: Monoesterpmentioning

confidence: 99%

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Organic phosphorus in marine sediments : chemical structure, diagenetic alteration, and mechanisms of preservation

Laarkamp¹

2000

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Phosphorus, an essential nutrient, is removed from the oceans only through burial with marine sediments. Organic phosphorus (Po,g) constitutes an important fraction (ca. 25%) oftotal-P in marine sediments. However, given the inherent lability of primary Po,g biochemicals, it is a puzzle that any Pm, is preserved in marine sediments. The goal of this thesis was to address this apparent paradox by linking bulk and molecular-level Po" information.A newly-developed sequential extraction method, which isolates sedimentary Po" reservoirs based on solubility, was used in concert with 3lp nuclear magnetic resonance spectroscopy (31p_NMR) to quantify Po,g functional group concentrations. The coupled extraction/ 31 P-NMR method was applied to three sediment cores from the Santa Barbara Basin, and the first-ever high-resolution depth profiles of molecular-level Po,g distribution during diagenesis were generated.These depth profiles were used to consider regulation of Pm, distribution by biomass abundance, chemical structure, and physical protection mechanisms. Biomass cannot account for more than a few percent of sedimentary Po,g. No evidence for direct structural control on remineralization of Po,g was found. Instead, sorptive protection appears to be an important mechanism for Po,g preservation, and structure may act as a secondary control due to preferential sorption of specific Pm, compound classes.

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Section: The Origin Of Orthophosphate In the Base Extractable Reservoirmentioning

confidence: 91%

Section: Analytical Artifact: Overestimation Ofp Mg ?mentioning

confidence: 99%

Section: Monoesterpmentioning

confidence: 99%

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Organic phosphorus in marine sediments : chemical structure, diagenetic alteration, and mechanisms of preservation

Laarkamp¹

2000

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“…Since the 1970s, it has been clear that an important proportion of aqueous P may be associated with high molecular mass organic matter in lake waters and sediments (Minear 1972;Lean 1973;Jackson and Schindler 1975;Ansems 2012;O'Connell et al 2014). Direct binding of phosphate to humic substances is not thought to occur (Hens and Merckx 2001), but there is strong indirect evidence for the existence of binding via bridging trivalent cations such as iron(III) or aluminum(III) (Jones et al 1988(Jones et al , 1993Gerke and Hermann 1992). Several recent studies have characterised synthetically produced organic matter -metalphosphate complexes (Kizewski et al 2010;Erro et al 2012) and structurally similar arsenate complexes (Mikutta and Kretzschmar 2011).…”

Section: Dissociation Of Ternary P Complexes With Humicsmentioning

confidence: 99%

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Orihel

Baulch

Casson

et al. 2017

Can. J. Fish. Aquat. Sci.

198

133

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Many physical, chemical, and biological processes in freshwater ecosystems mobilize the nutrient phosphorus (P) from sediments, which in turn may contribute to the formation of harmful algal blooms. Here, we critically reviewed internal P loading in Canadian fresh waters to understand the geographic patterns and environmental drivers of this important process. From 43 publications, we consolidated 618 estimates of internal P loading from Canadian freshwater ponds, lakes, reservoirs, and coastal wetlands (n = 70). Expressed in terms of total P, short-term gross rates in sediment samples (L gross ) ranged from −27 to 54 mg·m −2 ·day −1 (n = 461), while long-term net rates in whole ecosystems (L net ) ranged from −1694 to 10 640 mg·m −2 ·year −1 (n = 157). The main environmental drivers of this variation were oxygen, pH, geology, and trophic state. Internal P loading tended to be higher during the open-water season and most prominent in small prairie lakes. Priorities for future research on internal P loading should include resolving methodological problems, assessing the relative importance of different mechanisms, examining the influence of anthropogenic activities, and quantifying rates in understudied ecosystems. Résumé :De nombreux processus physiques, chimiques et biologiques dans les écosystèmes d'eau douce mobilisent le phosphore (P), un élément nutritif, des sédiments, ce qui peut favoriser la formation de fleurs d'eau néfastes. Nous avons effectué un examen critique de l'apport interne de P dans les plans d'eau douce canadiens afin de comprendre les motifs de répartition géographique et les facteurs environnementaux qui influent sur cet important processus. À la lumière de 43 publications, nous avons colligé 618 estimations de l'apport interne de P d'étangs, de lacs, de réservoirs et de milieux humides littoraux d'eau douce canadiens (n = 70). Exprimés en termes de P total, les taux d'apport de P à court terme pour les échantillons de sédiments (L gross ) vont de −27 à 54 mg·m -2 ·jour -1 (n = 461), alors que les taux nets à long terme à l'échelle de l'écosystème (L net ) vont de −1694 à 10 640 mg·m -2 ·an -1 (n = 157). Les principaux facteurs environnementaux influant sur ces variations sont l'oxygène, le pH, la géologie et l'état trophique. L'apport interne de P tend à être plus élevé durant la période d'eau libre et le plus marqué dans les petits lacs de prairie. La priorité des travaux futurs sur l'apport interne de P devrait porter sur la résolution de problèmes méthodologiques, l'évaluation de l'importance relative de différents mécanismes, l'examen de l'influence des activités humaines et la quantification des taux dans les écosystèmes sous-étudiés. [Traduit par la Rédaction]

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“…Fu (2000) 1) found that finer sediment exhibited greater phosphorus sorption index (PSI) in Lake Donghu, and that PSI increased with increasing pH and the maximum occurred about pH5.8 where the adsorption capacity was the largest. Meanwhile, organic molecules can form complexes with metal ions such as iron (Fe) and aluminum (Al), which in turn can sorb phosphorus and reduce its bioavailability [25] . Lopez et al [26] suggested that the concentrations of organic carbon and calcium carbonate could influence the absorption of PO 4 -P. Adsorption capacities of tidal flat surface sediments from the Yangtze Estuary showed significantly positive correlation with Fe 3+ and total organic carbon (TOC) concentration, and the adsorption efficiency of phosphate was mainly affected by TOC concentration.…”

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confidence: 99%

Spatiotemporal variations of internal P-loading and the related mechanisms in the large shallow Lake Chaohu

Zhang

Xie

et al. 2006

SCI CHINA SER D

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Spatiotemporal variations of P species and adsorption behavior in water column, interstitial water, and sediments were investigated in the large shallow eutrophic Lake Chaohu. Orthophosphate (Ortho-P) and total phosphorus (TP) concentrations were significantly higher in the western part than in the eastern part of the lake, due to different nutrient inputs from the surrounding rivers. Moreover, particulate phosphorus (PP) concentration was in a similar spatial pattern to Ortho-P and TP concentrations, and also showed significantly positive correlation with the biomass of Microcystis, indicating more uptake and store of phosphorus by Microcystis than by other algae. Increase of pH and intensive utilization of P by phytoplankton were the main factors promoting P (especially Fe-P) release from the sediment to interstitial water during the cyanobacterial blooms in Lake Chaohu. Spatial dynamics in TP concentration, P species and adsorption behavior of the sediment, coupled with the statistical analyses, suggested that the spatial heterogeneity of P contents in the sediment was influenced by various factors, e.g. human activities, soil geochemistry and mineral composition. In spite of similar TP contents in the sediments, increase in proportion of Fe-P concentration in the sediment may result in a high risk of P release.Keywords: eutrophication, water column, sediment, phosphorus, species, sorption and release, Lake Chaohu, cyanobacterial blooms.Dense blooms of phytoplankton, especially cyanobacteria, often occur in the hypereutrophic lakes. Outbreak of cyanobacterial blooms is one of the most important symptoms of eutrophic inland waters. P is considered to be the main factor inducing the nuisance growth of cyanobacteria. Cyanobacterial blooms in eutrophic lakes [1][2][3] are often coincident with the increase of P in the water column [4][5][6] . Song et al. [7] investigated the relationship between algal blooms and phosphorus status of sediment in ponds, and found that compared with the ponds lacking Microcystis aeruginosa the ponds with Microcystis aeruginosa blooms showed relatively high concentrations of Ortho-P in the overlying water or different P species in the interstitial water. However, studies on the influence of phytoplankton on P dynamics are very limited. Wang et al. [8] studied the effects of the variations of environmental conditions on phosphorus release from the sediments in Lake Taihu, and found a significant increase of P release when both algae and sediment were present in the experiment. Anderson [9] suggested that increased P release from the sediment in summer time [10] studied the influence of pH on P release from the sediments sampled from the freshwater tidal portion of the Potomac estuary, and found that the release rate increased markedly when pH of the overlying water was 9.5-10. Xie et al. [11] found the different responses of N and P in the sediment to the cyanobacterial blooms in an enclosure experiment conducted in Lake Donghu in the summer of 2000, and they conducted that ...

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Effects of dissolved humic substances on the speciation of iron and phosphate at different pH and ionic strength

Cited by 84 publications

References 12 publications

Organic phosphorus in marine sediments : chemical structure, diagenetic alteration, and mechanisms of preservation

Organic phosphorus in marine sediments : chemical structure, diagenetic alteration, and mechanisms of preservation

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Spatiotemporal variations of internal P-loading and the related mechanisms in the large shallow Lake Chaohu

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