Functional Characterization of Colloidal Phosphorus Species in the Soil Solution of Sandy Soils

Hens, Maarten; Merckx, Roel

doi:10.1021/es0013576

Cited by 109 publications

(93 citation statements)

References 50 publications

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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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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

View full text Add to dashboard Cite

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“…Accumulated evidence indicates that colloid-facilitated P transport is an important mechanism for P transfer from agricultural land to aquatic ecosystems (Heathwaite et al, 2005;Ilg et al, 2005;Siemens et al, 2008;Regelink et al, 2013). Colloidal P (P coll ) has been reported to contribute >50% of total P (TP) in soil water samples (Hens and Merckx, 2001). Due to their large specific surface area, soil colloids tend to have high P concentrations compared with bulk soils (Schoumans and Chardon, 2003).…”

Section: Molecular Speciation Of Phosphorus Present In Readily Dispermentioning

confidence: 99%

“…For example, P associated with Fe (hydr) oxides (Fe-P) is sensitive to reducing conditions (Beauchemin et al, 2003), P sorbed on Al (hydr)oxides (Al-P) or calcium phosphate precipitates is likely to be more vulnerable to pH changes (Lindsay et al, 1989), and organic P (P o ) is more bioavailable (Li and Brett, 2013). To date, however, the speciation of P coll has been characterized very generally by the colorimetric method or inductively coupled plasma mass spectrometry coupled with different size-fractionated techniques (Hens and Merckx, 2001;Van Moorleghem et al, 2011;Henderson et al, 2012;Regelink et al, 2013). Molecular speciation of P coll should be addressed to understand the long-term fate and subsequent impact of soilderived P coll in aquatic systems.…”

Section: Molecular Speciation Of Phosphorus Present In Readily Dispermentioning

confidence: 99%

Molecular Speciation of Phosphorus Present in Readily Dispersible Colloids from Agricultural Soils

Liu

Yang

Liang

et al. 2014

Soil Science Society of America Journal

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“…Phosphorus associated with such colloids can contribute to the MRP fraction following solubilization in the acidic medium of the reaction solution. Some acid-labile organic phosphates can also be hydrolyzed, but their contribution is negligible in the analysis of soil and soil solution (Bowman, 1989;Hens and Merckx, 2001).…”

mentioning

confidence: 99%

Colloidal Phosphorus in Surface Runoff and Water Extracts from Semiarid Soils of the Western United States

2004

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Colloidal particles in runoff may have an important role in P transfer from soils to waterbodies, but remain poorly understood. We investigated colloidal molybdate-reactive phosphorus (MRP) in surface runoff and water extracts of calcareous arable soils from the semiarid western United States. Colloidal MRP was determined by ultrafiltration and operationally defined as MRP associated with particles between 1µm and 1 nm diameter, although a smaller pore-size filter (0.3 nm) was used to define the lower size limit of colloids in water extracts. In surface runoff from three calcareous soils generated by simulated sprinkler irrigation, colloidal MRP concentrations ranged between 0.16 and 3.07 1LM, constituting between 11 and 56% of the MRP in the <1-gm fraction. Concentrations were strongly correlated with agronomic and environmental soil-test P concentrations for individual soils. Water extracts of a range of similar soils contained two size fractions of colloidal MRP: a larger fraction (L0-0.21Lm) probably associated with fine clays, and a smaller fraction (3-0.3 nm) probably associated with Ca-phosphate minerals. Colloidal MRP was solubilized in the acidic medium of the colorimetric detection procedure, suggesting that a fraction of the filterable MRP in runoff from calcareous soils may not be as readily bioavailable as free phosphate in waterbodies. Our results suggest that colloidal MRP is an important but poorly understood component of P transfer in runoff from calcareous western U.S. soils and should be given greater consideration in mechanistic studies of the P transfer process. P HOSPHORUS TRANSFER in runoff from agricultural soils to watercourses can contribute to blooms of toxin producing cyanobacteria (blue-green algae) and other water quality problems associated with eutrophication (Foy and Withers, 1995;Leinweber et al., 2002). As a result, a considerable research effort has aimed to quantify P transfer from agricultural land, and data now exist for a range of soils and agronomic management practices (for a recent review see Haygarth and Jarvis [1999]). Meaningful interpretation of such data requires a thorough understanding of P speciation and the analytical procedures involved in its determination.Conventionally, it is considered desirable to know the concentration of free phosphate in runoff, because this is the form most readily available to algae in waterbodies (Reynolds, 1984). This is estimated by crude fractionation based on membrane filtration (typically 0.45-or 0.2-1.Lm pore size) and reaction with molybdate (Murphy and Riley, 1962), but rarely provides an accurate value of the true dissolved phosphate concentration in envi-

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Functional Characterization of Colloidal Phosphorus Species in the Soil Solution of Sandy Soils

Cited by 109 publications

References 50 publications

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

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

Molecular Speciation of Phosphorus Present in Readily Dispersible Colloids from Agricultural Soils

Colloidal Phosphorus in Surface Runoff and Water Extracts from Semiarid Soils of the Western United States

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