Abiotic phosphorus recycling from adsorbed ribonucleotides on a ferrihydrite-type mineral: Probing solution and surface species

Klein, Annaleise R.; Bone, Sharon E.; Bakker, Eleanor; Chang, Zi-Qian; Aristilde, Ludmilla

doi:10.1016/j.jcis.2019.03.086

Cited by 25 publications

(24 citation statements)

References 78 publications

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“…However, our results suggest that any contribution of adsorbed phytates might alternatively be described with a combination of organic P and Fe-and Al-associated PO 4 . This is also in line with recent work showing that the white-line energy and intensity, upon the adsorption of an organic P species to an Fe and Al (hydr)oxide, change to values intermediate to those of pure organic P and of inorganic PO 4 adsorbed to the same (hydr)oxides [31,32]. For these reasons, we decided to exclude the adsorbed phytates from our database for soils.…”

Section: Uniqueness Of Standards Used For Lcfsupporting

confidence: 78%

A Probabilistic Approach to Phosphorus Speciation of Soils Using P K-edge XANES Spectroscopy with Linear Combination Fitting

et al. 2020

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A common technique to quantitatively estimate P speciation in soil samples is to apply linear combination fitting (LCF) to normalized P K-edge X-ray absorption near-edge structure (XANES) spectra. Despite the rapid growth of such applications, the uncertainties of the fitted weights are still poorly known. Further, there are few reports to what extent the LCF standards represent unique end-members. Here, the co-variance between 34 standards was determined and their significance for LCF was discussed. We present a probabilistic approach for refining the calculation of LCF weights based on Latin hypercube sampling of normalized XANES spectra, where the contributions of energy calibration and normalization to fit uncertainty were considered. Many of the LCF standards, particularly within the same standard groups, were strongly correlated. This supports an approach in which the LCF standards are grouped. Moreover, adsorbed phytates and monetite were well described by other standards, which puts into question their use as end-members in LCF. Use of the probabilistic method resulted in uncertainties ranging from 2 to 11 percentage units. Uncertainties in the calibrated energy were important for the LCF weights, particularly for organic P, which changed with up to 2.7 percentage units per 0.01 eV error in energy. These results highlight the necessity of careful energy calibration and the use of frequent calibration checks. The probabilistic approach, in which at least 100 spectral variants are analyzed, improves our ability to identify the most likely P compounds present in a soil sample, and a procedure for this is suggested in the paper.

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Section: Uniqueness Of Standards Used For Lcfsupporting

confidence: 78%

A Probabilistic Approach to Phosphorus Speciation of Soils Using P K-edge XANES Spectroscopy with Linear Combination Fitting

et al. 2020

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“…Although incomplete correction of the background atmosphere (CO2) could have occurred, this is particularly visible in the wavelength ranges relating to dissolved inorganic phosphorus species(e.g. Tammer 2004;Elzinga and Sparks 2007;Klein et al 2019). In this range, slightly higher or lower absorptions, corresponding to different Phosphate species were observed for the Sandy-Loam (high OM) and Silty-Clay (low OM) soil solutions, which are precisely the soils in which the mobility of CuO-NPs was highest (Figure 2).…”

Section: Spectral Characteristics Of Soils and Soils Solutionsmentioning

confidence: 85%

“…Phosphate is known to strongly sorb on metal oxides (e.g. Fe, Cu and Al oxides) even in acidic natural environments (Mahdavi and Akhzari 2016;Claudio et al 2017;Klein et al 2019).…”

Section: Phosphate Effect On Nps Transportmentioning

confidence: 99%

Low mobility of CuO and TiO2 nanoparticles in agricultural soils of contrasting texture and organic matter content

Simonin

Martins

Uzu

et al. 2021

Science of The Total Environment

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The fate of nanoparticles (NPs) in soil under relevant environmental conditions is still poorly understood. In this study, the mobility of two metal-oxide nanoparticles (CuO and TiO2) in contrasting agricultural soils was investigated in water-saturated soil columns. The transport of TiO2 and CuO-NPs were assessed in six soils with three different textures (from sand to clay) and two contrasted organic matter (OM) contents for each texture. TiO2 mobility was very low in all soils, regardless of texture and OM content. Mass recoveries were always less than 5%, probably in relation with the strong homo-aggregation of TiO2-NPs observed in all soil solutions, with apparent sizes 3-6 times larger than their nominal size. This low mobility suggests that TiO2-NPs present a low risk of direct groundwater contamination in contrasted surface soils. Although their retention was also generally high (more than 86%), CuO nanoparticles were found to be mobile in all soils. This is probably related to their smaller apparent size and low capacity of homo-aggregation of CuO-NPs in all soil solutions. No clear influence of neither soil texture or soil total organic matter content could be observed on CuO transport. However, this study shows that in contrasted agricultural soils, CuO-NPs transport is mainly controlled by the solutes dissolved in soil solution (DOC and PO4 species), rather than by the properties of the soil solid phase.

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“…In previous studies for a phosphomonoester-ferrihydrite or -goethite system, the authors assigned the bands near 1150 cm −1 and 1030 cm −1 to the P-O vibrations, which indicated the significant distortions of the P-O bonds as phosphomonoesters coordinated to goethite [25,49,50]. Additionally, in their structural interpretation of phosphate/phosphonate surface complexes, either a bidentate coordination or a monodentate coordination in combination with hydrogen bonding to neighboring surface oxometallic sites was favored [25,[49][50][51]. Thus, in the NPP-U(IV) NPs system, we speculate that inner-sphere surface complexes are formed on U(IV) NPs , and more specifically, two terminal oxygens of the phosphate are fully coordinated to the particle surfaces; i.e., in a bidentate fashion.…”

Section: Atr-ftir Spectra Of Solid Phase U(iv)npsmentioning

confidence: 99%

Rapid Hydrolysis of Organophosphates Induced by U(IV) Nanoparticles: A Kinetic and Mechanistic Study using Spectroscopic Analysis

Cho

Cha

2019

Colloids and Interfaces

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The heterogeneous interactions of colloidal U particles with organophosphates, leading to the formation of U-phosphate minerals, can retard the migration of U in contaminated sites. Here, we studied the hydrolytic mechanism of p-nitrophenyl phosphate (NPP) on the surfaces of tetravalent uranium nanoparticles (U(IV)NPs), resulting in the formation of U-phosphate precipitates. Our study shows that the reaction rate of NPP hydrolysis is significantly enhanced by U(IV)NPs through a multi-step heterogeneous reaction on the particle surfaces. The end products of the reaction were identified as U(IV)NPs-aggregates with surface-bound phosphates. Colloidal properties, such as high positive values of the zeta-potential (>+30 mV) and large surface areas of U(IV)NPs due to their unique cluster structures consisting of relatively small primary UO2(cr)-particles, are correlated with their reactivity towards hydrolysis reaction. Reaction kinetic modeling studies using spectrophotometric data indicated the presence of two distinct reaction intermediates as the surface complexes of NPP on U(IV)NPs. We suggest the involvement of the NPP inner-sphere complexes in the rate-determining step based on the results obtained by analyzing the ATR-FTIR spectra and the surface-enhanced infrared absorption of NPP bound to substrate surfaces.

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Abiotic phosphorus recycling from adsorbed ribonucleotides on a ferrihydrite-type mineral: Probing solution and surface species

Cited by 25 publications

References 78 publications

A Probabilistic Approach to Phosphorus Speciation of Soils Using P K-edge XANES Spectroscopy with Linear Combination Fitting

A Probabilistic Approach to Phosphorus Speciation of Soils Using P K-edge XANES Spectroscopy with Linear Combination Fitting

Low mobility of CuO and TiO2 nanoparticles in agricultural soils of contrasting texture and organic matter content

Rapid Hydrolysis of Organophosphates Induced by U(IV) Nanoparticles: A Kinetic and Mechanistic Study using Spectroscopic Analysis

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