Fe hydroxyphosphate precipitation and Fe(II) oxidation kinetics upon aeration of Fe(II) and phosphate-containing synthetic and natural solutions

Grift, B. van der; Behrends, Thilo; Osté, Leonard; Schot, P.P.; Wassen, Martin J.; Griffioen, Jasper

doi:10.1016/j.gca.2016.04.035

Cited by 51 publications

(35 citation statements)

References 61 publications

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“…Particulate or colloidal P is formed at the groundwater-surface water interface in groundwater-fed lowland catchments (Van der Grift et al, 2014Baken et al, 2015). The formation of Fe hydroxyphosphate precipitates, with molar P/Fe ratio of 0.5 is the main immobilization process of dissolved P during Fe(II) oxidation (Voegelin et al, 2013;Van der Grift et al, 2016) and therefore a major control on the P retention in natural waters that drain anaerobic aquifers. As a consequence, Febound P can be the dominant P fraction in suspended particulate matter under such conditions (Van der Grift, 2017).…”

Section: Difficulties In Predictions Of Dissolved/colloidal/particulamentioning

confidence: 99%

Challenges of Reducing Phosphorus Based Water Eutrophication in the Agricultural Landscapes of Northwest Europe

et al. 2018

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Section: Difficulties In Predictions Of Dissolved/colloidal/particulamentioning

confidence: 99%

Challenges of Reducing Phosphorus Based Water Eutrophication in the Agricultural Landscapes of Northwest Europe

et al. 2018

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“…The background concentration of Fe in natural waters ranges from <1 mg/L for aerated surface waters to approximately 90 mg/L for Fe‐rich groundwater (i.e., well within the toxic thresholds found in the present study). Phosphorus, on the other hand, is a common agricultural pollutant, and the Fe–P sequestration processes described in the present study also occur in nature and may play a positive role in decreasing eutrophication .…”

Section: Resultsmentioning

confidence: 64%

Effect of Fe (III) on Pseudokirchneriella subcapitata at circumneutral pH in standard laboratory tests is explained by nutrient sequestration

Arbildua¹,

Villavicencio²,

Urrestarazu³

et al. 2016

Enviro Toxic and Chemistry

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The complex chemistry of iron (Fe) at circumneutral pH in oxygenated waters and the poor correlation between ecotoxicity results in laboratory and natural waters have led to regulatory approaches for iron based on field studies (US Environmental Protection Agency Water Quality Criteria and European Union Water Framework Directive proposal for Fe). The results of the present study account for the observed differences between laboratory and field observations for Fe toxicity to algae (Pseudokirchneriella subcapitata). Results from standard 72-h assays with Fe at pH 6.3 and pH 8 resulted in similar toxicity values measured as algal biomass, with 50% effect concentrations (EC50) of 3.28 mg/L and 4.95 mg/L total Fe(III), respectively. At the end of the 72-h exposure, however, dissolved Fe concentrations were lower than 30 μg/L for all test concentrations, making a direct toxic effect of dissolved iron on algae unlikely. Analysis of nutrient concentrations in the artificial test media detected phosphorus depletion in a dose-dependent manner that correlated well with algal toxicity. Subsequent experiments adding excess phosphorus after Fe precipitation eliminated the toxicity. These results strongly suggest that observed Fe(III) toxicity on algae in laboratory conditions is a secondary effect of phosphorous depletion. Environ Toxicol Chem 2017;36:952-958. © 2016 SETAC.

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“…Nutrient availability in mineral-rich fens has been studied rather extensively in the past (e.g., Boyer and Wheeler 1989;Verhoeven et al 1990;Wheeler 1993, 1995;Wassen et al 2005;Kooijman and Paulissen 2006). However, recent studies have provided controversial insights, especially related to availability of P in Fe-rich fens (Zak et al 2008;Aggenbach et al 2013;Pawlikowski et al 2013;Cusell et al 2014;van der Grift et al 2016;Emsens et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…In Fe-rich fens, sorption of P to, or precipitation with Fe may thus be an important mechanism to reduce Pavailability in soil pore water (Zak et al 2004). When anoxic, Fe-rich groundwater is aerated, precipitation of iron hydroxyphosphates may even precede formation of iron (hydr)oxides as long as dissolved orthophosphate is present (van der Grift et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…High P availability in Fe-rich fens may be caused by permanently high water levels, which leads to anoxic conditions, reduction of Fe(III) and mobilization of Fe-bound P (Patrick and Khalid 1974;Lamers et al 2012), However, high plant P contents and foliar N:P ratios below 10 g g −1 were found in Fe-rich soils even under well-drained conditions (Emsens et al 2017), so other factors play a role as well. In Fe-rich fens, P availability to the vegetation could also increase if a large part of the P is sorbed to complexes of Fe and organic matter (OM), rather than to Fe (hydr)oxides (Kooijman et al 2009;Gerke 2010;van der Grift et al 2016). Sorption of P to Fe-OM complexes provides a weaker form of binding, but is often ignored in studies about P-availability (Gerke 2010(Gerke , 2015.…”

Section: Introductionmentioning

confidence: 99%

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Re-assessment of phosphorus availability in fens with varying contents of iron and calcium

et al. 2019

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Aim To further unravel P availability in mineral-rich fens, and test whether high Fe in the soil would lead to low P availability to the vegetation. Methods Mesotrophic fens were selected over gradients in Ca and Fe in central Sweden and the Netherlands, to study characteristics of vegetation, pore water and peat soil, including inorganic and organic forms of P, Fe and Al.Results Soil Fe was more important than region or soil Ca, and P availability to the vegetation increased from Fe-poor to Fe-rich fens. Contrary to expectations, precipitation of iron phosphates played a minor role in Ferich fens. Fe-rich fens were P-rich for three reasons: (1) high P sorption capacity, (2) relatively weak sorption to Fe-OM complexes and (3) high amounts of sorbed organic P, which probably consists of labile P. Also, nonmycorrhizal wetland plants probably especially take up weakly sorbed (organic) P. However, high P did not lead to high biomass or low plant diversity. Fe-rich fens were limited by other nutrients, and high P may help protect the vegetation against Fe-toxicity.

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Fe hydroxyphosphate precipitation and Fe(II) oxidation kinetics upon aeration of Fe(II) and phosphate-containing synthetic and natural solutions

Cited by 51 publications

References 61 publications

Challenges of Reducing Phosphorus Based Water Eutrophication in the Agricultural Landscapes of Northwest Europe

Challenges of Reducing Phosphorus Based Water Eutrophication in the Agricultural Landscapes of Northwest Europe

Effect of Fe (III) on Pseudokirchneriella subcapitata at circumneutral pH in standard laboratory tests is explained by nutrient sequestration

Re-assessment of phosphorus availability in fens with varying contents of iron and calcium

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