The influence of pH on iron speciation in podzol extracts: Iron complexes with natural organic matter, and iron mineral nanoparticles

Neubauer, Elisabeth; Schenkeveld, Walter D. C.; Plathe, Kelly Lee; Rentenberger, Christian; Kammer, Frank von der; Kraemer, Stephan M.; Hofmann, Thilo

doi:10.1016/j.scitotenv.2013.04.076

Cited by 61 publications

(56 citation statements)

References 54 publications

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“…At pH 7, iron is also susceptible to precipitation as iron (oxy)hydroxide. A redistribution of NOM-associated elements onto iron (oxy)hydroxides could only happen during the sample injection and focusing period (in total b5 min), because during the fractionation, NOM moves much faster in the FlowFFF channel than larger iron (oxy)hydroxide colloids (Neubauer et al, 2013b), and therefore these two colloid types would be physically distant from each other during separation. Therefore, desorption from the NOM would rather lead to passage of dissolved species through the FlowFFF membrane than to sorption onto iron (oxy) hydroxides.…”

Section: Tablementioning

confidence: 99%

Colloid-associated export of arsenic in stream water during stormflow events

et al. 2013

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Section: Tablementioning

confidence: 99%

Colloid-associated export of arsenic in stream water during stormflow events

et al. 2013

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“…However, there are no studies with a specific emphasis on P bound to WDC and especially their nanoparticle fraction using these treatments. The latter, however, can be achieved using asymmetric flow field‐flow fractionation (AF4) (Jirsa et al, 2013; Neubauer et al, 2013, Stolpe et al, 2013), particularly when coupled with ultraviolet (UV) and an inductively coupled plasma mass spectrometer (ICP–MS) for real‐time analysis of organic matter and elemental composition of the different particles. Recently, these techniques have been successfully applied for characterizing colloidal P in natural water and soil samples (Gottselig et al, 2014; Henderson et al, 2012; Regelink et al, 2013a).…”

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Phosphorus Containing Water Dispersible Nanoparticles in Arable Soil

et al. 2015

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Due to the limited solubility of phosphorus (P) in soil, understanding its binding in fine colloids is vital to better forecast P dynamics and losses in agricultural systems. We hypothesized that water-dispersible P is present as nanoparticles and that iron (Fe) plays a crucial role for P binding to these nanoparticles. To test this, we isolated water-dispersible fine colloids (WDFC) from an arable topsoil (Haplic Luvisol, Germany) and assessed colloidal P forms after asymmetric flow field-flow fractionation coupled with ultraviolet and an inductively coupled plasma mass spectrometer, with and without removal of amorphous and crystalline Fe oxides using oxalate and dithionite, respectively. We found that fine colloidal P was present in two dominant sizes: (i) in associations of organic matter and amorphous Fe (Al) oxides in nanoparticles <20 nm, and (ii) in aggregates of fine clay, organic matter and Fe oxides (more crystalline Fe oxides) with a mean diameter of 170 to 225 nm. Solution P-nuclear magnetic resonance spectra indicated that the organically bound P predominantly comprised orthophosphate-monoesters. Approximately 65% of P in the WDFC was liberated after the removal of Fe oxides (especially amorphous Fe oxides). The remaining P was bound to larger-sized WDFC particles and Fe bearing phyllosilicate minerals. Intriguingly, the removal of Fe by dithionite resulted in a disaggregation of the nanoparticles, evident in higher portions of organically bound P in the <20 nm nanoparticle fraction, and a widening of size distribution pattern in larger-sized WDFC fraction. We conclude that the crystalline Fe oxides contributed to soil P sequestration by (i) acting as cementing agents contributing to soil fine colloid aggregation, and (ii) binding not only inorganic but also organic P in larger soil WDFC particles.

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“…In a recent work performed in Germany and Sweden, measurements of natural NPs and colloidal organic matter in soil and river samples were carried out (Hassell€ ov and von der Kammer, 2008). In this study, it was determined that lead is associated with iron-oxide colloids, which are ubiquitous natural NPs that can be efficiently transported (Neubauer et al, 2013). The association and stabilization of NPs (natural, incidental or engineered) with natural organic material, as well as with other organic contaminants, is relevant to their toxicological implications in aquatic ecosystems (Farr e et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

“…Coal beneficiation is a process where pollutants are removed prior to combustion. This statement is appropriate to both man made aquatic systems, such as nanoparticles (NPs) in water treatment plants and distribution systems , and natural aquatic systems, such as rivers and groundwater (Johnson et al, 2014;Novikov et al, 2006). Nano-mineralogy of sediments transport is important in order to characterize conditions and process governing water quality, invertebrate and fish habitat, reservoir sedimentation and coastline dynamics.…”

Section: Introductionmentioning

confidence: 99%