Investigation on the control of phosphate leaching by sorption and colloidal transport: Column studies and multi-surface complexation modelling

Warrinnier, Ruben; Goossens, Thomas; Amery, Fien; Nest, Thijs Vanden; Verbeeck, Mieke; Smolders, Erik

doi:10.1016/j.apgeochem.2018.12.012

Cited by 20 publications

(33 citation statements)

References 48 publications

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“…The presence of P org in the AO extracts implies that the validation of the probe-ion method cannot be based on the comparison of the calculated R-PO 4 and the amount of AO-P tot , as it was done previously. 7 In other SCM studies, the use of AO-P tot rather than AO-PO 4 as a measure for R-PO 4 has led to an overestimation of the PO 4 concentration in soil leachates 64 and soil-solution extracts. 25 Therefore, the authors proposed the use of isotopically exchangeable PO 4 ( E -value) as a proxy for R-PO 4 in SCM.…”

Section: Resultsmentioning

confidence: 99%

“…The SSAs of the reactive metal-(hydr)oxides obtained for our soils ( Tables 1 and S1 ) largely vary, as it ranges between ∼350 and 1400 m 2 /g. Hence, the use of a “standard” SSA value for AO-extractable Fe- and Al-(hydr)oxides, as often done in SCM studies (e.g., 600 m 2 /g), 25 , 32 , 64 may lead to a large deviation in the supposed availability of reactive sites in the soils. This, in turn, will affect the outcome of the ion adsorption modeling.…”

Section: Resultsmentioning

confidence: 99%

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Assessing the Reactive Surface Area of Soils and the Association of Soil Organic Carbon with Natural Oxide Nanoparticles Using Ferrihydrite as Proxy

Méndez

Hiemstra

Koopmans

2020

Environ. Sci. Technol.

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Assessment of the surface reactivity of natural metal-(hydr)oxide nanoparticles is necessary for predicting ion adsorption phenomena in soils using surface complexation modeling. Here, we describe how the equilibrium concentrations of PO 4 , obtained with 0.5 M NaHCO 3 extractions at different solution-to-soil ratios, can be interpreted with a state-of-the-art ion adsorption model for ferrihydrite to assess the reactive surface area (RSA) of agricultural top soils. Simultaneously, the method reveals the fraction of reversibly adsorbed soil PO 4 (R-PO 4 ). The applied ion-probing methodology shows that ferrihydrite is a better proxy than goethite for consistently assessing RSA and R-PO 4 . The R-PO 4 pool agrees well with ammonium oxalate (AO)-extractable phosphorus, but only if measured as orthophosphate. The RSA varied between ∼2 and 20 m 2 /g soil. The corresponding specific surface area (SSA) of the natural metal-(hydr)oxide fraction is ∼350–1400 m 2 /g, illustrating that this property is highly variable and cannot be represented by a single value based on the AO-extractable oxide content. The soil organic carbon (SOC) content of our top soils increases linearly not only with the increase in RSA but remarkably also with the increase in mean particle size (1.5–5 nm). To explain these observations, we present a structural model for organo-mineral associations based on the coordination of SOC particles to metal-(hydr)oxide cores.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Assessing the Reactive Surface Area of Soils and the Association of Soil Organic Carbon with Natural Oxide Nanoparticles Using Ferrihydrite as Proxy

Méndez

Hiemstra

Koopmans

2020

Environ. Sci. Technol.

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“…Phosphate is a limiting factor for cultivation, but recent overfertilization has caused severe environmental problems worldwide, such as eutrophication and algae blooms in water systems (Young et al 1989). Many studies have confirmed that iron (hydr)oxide is the main adsorbent for phosphorus, and the comobilization of phosphorus and iron (hydr)oxide colloids has been reported (Szilas et al 1998;Makris et al 2006;Warrinnier et al 2019).…”

Section: Nutrientsmentioning

confidence: 98%

Factors modifying the structural configuration of oxyanions and organic acids adsorbed on iron (hydr)oxides in soils. A review

Han

Kim

2020

Environ Chem Lett

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Oxyanions are ubiquitous in soils, organisms and the environment. Due to their unique chemical structure, oxyanions can be easily transferred into other systems. Carbonate (CO 3 2−), nitrate (NO 3 −), phosphate (PO 4 3−), silicate (SiO 4 2−) and sulfate (SO 4 2−) are the major oxyanions in organisms and the soil environment, whereas arsenate (AsO 4 3−), antimonate (SbO 4 3−), borate (BO 3 3−), selenate (SeO 4 2−), and tellurate (TeO 4 2−) are generally reported as toxic chemicals found at trace levels. Excessive oxyanions leached from soils into water have caused severe environmental problems. Here, we review the factors affecting the structural configuration of oxyanions and organic acids adsorbed on iron oxides and hydroxides. The configuration of oxyanions on iron (hydr)oxides is controlled by surface loading, pH, sample phase, competing ions and organic acids. Under conditions of low surface loading and low pH at the interface in the absence of competing ions, oxyanions with high affinity possibly form a complex with higher denticity. But an increase in pH decreases the number of sorption sites; thus, a transition from a tri-or bidentate complex to monodentate and outer-sphere complexes occurs.

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“…33 Soils from this trial had been sampled before for measuring P leaching in disturbed columns. 3 That study showed that the leachate P concentrations were in general determined by PO4 sorption on bulk soil Fe and Al oxyhydroxides and that colloidal forms of these oxyhydroxides accelerated P transport. 3 The controlling factors at field scale remain poorly resolved.…”

Section: Introductionmentioning

confidence: 96%

“…particles with a diameter < 1 µm, bind PO4 and facilitate P transport, up to a factor of 50. 3,[7][8][9][10][11] The factors controlling colloid-fluxes are, however, not well known. Increasing Ca 2+ concentrations decrease organic-matter-(OM)-stabilized Fe and Al oxyhydroxide colloid concentrations in freshwater by enhancing flocculation.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Respiration in the Unsaturated Zone of Agricultural Soil Mobilizes Phosphorus and Manganese

Warrinnier

Bossuyt

Resseguier

et al. 2020

Environ. Sci. Technol.

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Anaerobic conditions mobilise phosphorus (P) in soils and sediments. The role of anaerobic microsites in well-drained soil on P migration is unknown. This study aimed to identify mechanisms that control field-scale vertical P mobility as affected by organic fertilisers that may trigger variable redox conditions. Soils were sampled at different depths in a well-drained Luvisol after 19-years of application of organic fertilisers. The concentrations of P and manganese (Mn) in 0.45-µm-filtered extracts (10 -3 M CaCl2) of field-moist soil samples were strongly correlated (r = + 0.95) and both peaked in and below the compacted plough pan; suggesting that reductive processes mobilise P. Waterlogged soil incubations confirmed that anaerobic respiration comobilises Mn and P and that this leads to the release of colloidal P and iron (Fe). The long-term applications of farmyard manure and immature compost enhanced the concentrations of Mn, Fe, and aluminium (Al) in the soil solution of subsurface samples, whereas less such effect was found under the application of more stable organic fertilisers. Farmyard manure application significantly enhanced soil P stocks below the plough layer despite a small P input. Overall, multiple lines of evidence confirm that anaerobic respiration, sparked by labile organic matter, mobilises P in this seemingly well-drained soil.

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Investigation on the control of phosphate leaching by sorption and colloidal transport: Column studies and multi-surface complexation modelling

Cited by 20 publications

References 48 publications

Assessing the Reactive Surface Area of Soils and the Association of Soil Organic Carbon with Natural Oxide Nanoparticles Using Ferrihydrite as Proxy

Assessing the Reactive Surface Area of Soils and the Association of Soil Organic Carbon with Natural Oxide Nanoparticles Using Ferrihydrite as Proxy

Factors modifying the structural configuration of oxyanions and organic acids adsorbed on iron (hydr)oxides in soils. A review

Anaerobic Respiration in the Unsaturated Zone of Agricultural Soil Mobilizes Phosphorus and Manganese

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