Rälf Kaegi
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View article: Atmospheric deposition of microplastics: a sampling and analytical method including the associated measurement uncertainties
Atmospheric deposition of microplastics: a sampling and analytical method including the associated measurement uncertainties Open
Microplastics (MPs) are environmental contaminants of global concern, and the atmosphere may play an important role in their environmental distribution. In this study, we developed a tailored analytical chain – including sample collection,…
View article: Supplementary material to "Atmospheric deposition of microplastics: a sampling and analytical method including the associated measurement uncertainties"
Supplementary material to "Atmospheric deposition of microplastics: a sampling and analytical method including the associated measurement uncertainties" Open
View article: Quantification of small (1–10 µm) microplastic particles in soil matrices using automated scanning electron microscopy: possibilities and limitations
Quantification of small (1–10 µm) microplastic particles in soil matrices using automated scanning electron microscopy: possibilities and limitations Open
Scanning electron microscopy (SEM) provides superb resolution power and allows distinguishing microplastic particles (MPs) from other particles based on elemental ratios derived from energy dispersive x-ray (EDX) analysis. Polycarbonate (P…
View article: Oxygen Isotope Analyses of Phosphate and Organophosphorus Compounds by Electrospray Ionization Orbitrap Mass Spectrometry
Oxygen Isotope Analyses of Phosphate and Organophosphorus Compounds by Electrospray Ionization Orbitrap Mass Spectrometry Open
Orbitrap mass spectrometry with electrospray ionization (ESI-Orbitrap MS) enables 18O/16O ratio measurements in phosphate and organophosphorus compounds, which offers promising avenues for the study of metabolic, biog…
View article: Efficient removal of microplastic particles from wastewater through formation of heteroagglomerates during the activated sludge process
Efficient removal of microplastic particles from wastewater through formation of heteroagglomerates during the activated sludge process Open
Microplastic particles (MPs) are efficiently transferred from wastewater to sludge during wastewater treatment, but it remains unclear to what extent the physical-chemical properties (e.g., polymer type, shape, size) of the MPs affect thei…
View article: Deciphering the nature of secondary Ag S species in soils polluted with Ag nanoparticles
Deciphering the nature of secondary Ag S species in soils polluted with Ag nanoparticles Open
International audience
View article: Time-efficient approach for environmental transformation and bioavailability assessment of isotopically enriched nanoparticles to increase environmental relevance
Time-efficient approach for environmental transformation and bioavailability assessment of isotopically enriched nanoparticles to increase environmental relevance Open
The increasing use of engineered nanoparticles (NPs) and their release into the environment requires an assessment of their fate and (eco-) toxicological effects. Previous studies have often focused on pristine NPs or NPs spiked into the e…
View article: Effects of organic ligands, phosphate and Ca on the structure and composition of Fe(<scp>iii</scp>)-precipitates formed by Fe(<scp>ii</scp>) oxidation at near-neutral pH
Effects of organic ligands, phosphate and Ca on the structure and composition of Fe(<span>iii</span>)-precipitates formed by Fe(<span>ii</span>) oxidation at near-neutral pH Open
The type and concentration of dissolved organic carbon in combination with phosphate, calcium and other solutes determine the structure and composition of Fe( iii )-precipitates formed by Fe( ii ) oxidation in near-neutral bicarbonate-buff…
View article: Low molecular weight organic acids stabilise siderite against oxidation and influence the composition of iron (oxyhydr)oxide oxidation products
Low molecular weight organic acids stabilise siderite against oxidation and influence the composition of iron (oxyhydr)oxide oxidation products Open
Siderite is stabilised against oxidation in the presence of Low Molecular Weight Organic Acids (LMWOAs) with implications for iron mineral transformations and therefore contaminant and nutrient cycling.
View article: Influence of aging, morphology and particle size on the behavior of microplastics during magnetic seeded filtration
Influence of aging, morphology and particle size on the behavior of microplastics during magnetic seeded filtration Open
Magnetic seeded filtration (MSF) is a solid-liquid separation process based on the formation of hetero-agglomerates between target (non-magnetic) particles and added magnetic particles, followed by magnetic separation. Previous experimenta…
View article: Impact of Nanoplastic Particles on Macrophage Inflammation and Intestinal Health in a Mouse Model of Inflammatory Bowel Disease
Impact of Nanoplastic Particles on Macrophage Inflammation and Intestinal Health in a Mouse Model of Inflammatory Bowel Disease Open
Background: The increasing presence of plastics in the human diet is raising public concern about the potential risks posed by nanoplastic (NP) particles, which can emerge from the degradation of plastic debris. NP ingestion poses particul…
View article: Reduced bioavailability of Au and isotopically enriched 109Ag nanoparticles transformed through a pilot wastewater treatment plant in Hyalella azteca under environmentally relevant exposure scenarios
Reduced bioavailability of Au and isotopically enriched 109Ag nanoparticles transformed through a pilot wastewater treatment plant in Hyalella azteca under environmentally relevant exposure scenarios Open
View article: Aluminium substitution affects jarosite transformation to iron oxyhydroxides in the presence of aqueous Fe(II)
Aluminium substitution affects jarosite transformation to iron oxyhydroxides in the presence of aqueous Fe(II) Open
Jarosite is an abundant mineral in acidic environments, often found in acid sulfate soil (ASS) and acid-mine drainage (AMD). As a store of Fe, K, S and acidity, and a scavenger for major and trace elements, jarosite plays an important role…
View article: Structural Effects of Aluminum and Iron Occupancy in Minerals of the Jarosite-Alunite Solid Solution
Structural Effects of Aluminum and Iron Occupancy in Minerals of the Jarosite-Alunite Solid Solution Open
The alunite supergroup of minerals contains several hydroxysulfate mineral phases that commonly occur in acidic natural and engineered environments. The main division of the mineral supergroup defines two minerals, jarosite and alunite, ba…
View article: Arsenic co-precipitation with iron oxidation products and retention during precipitate aging: Effects of phosphate, silicate and calcium
Arsenic co-precipitation with iron oxidation products and retention during precipitate aging: Effects of phosphate, silicate and calcium Open
Arsenic (As) co-precipitates with ferric iron (Fe(III)) precipitates formed by the oxidation of ferrous iron (Fe(II)) in water. This process is of great importance in the removal of As from drinking water and for the fate of As in environm…
View article: Revisiting the Strategy for Marine Litter Monitoring within the European Marine Strategy Framework Directive (Msfd)
Revisiting the Strategy for Marine Litter Monitoring within the European Marine Strategy Framework Directive (Msfd) Open
View article: Depth-dependent transformation of ZnO and Ag nanoparticles in sulfate-reducing sediments tracked using scanning transmission electron microscopy
Depth-dependent transformation of ZnO and Ag nanoparticles in sulfate-reducing sediments tracked using scanning transmission electron microscopy Open
The transformation of Ag and ZnO nanoparticles was investigated along pore water depth gradients in sulfate-reducing sediments. This work highlights the benefits of tailored experimental strategies to study nanoparticle environmental trans…
View article: Particle-Scale Understanding of Arsenic Interactions with Sulfidized Nanoscale Zerovalent Iron and Their Impacts on Dehalogenation Reactivity
Particle-Scale Understanding of Arsenic Interactions with Sulfidized Nanoscale Zerovalent Iron and Their Impacts on Dehalogenation Reactivity Open
Co-occurrence of organic contaminants and arsenic oxoanions occurs often at polluted groundwater sites, but the effect of arsenite on the reactivity of sulfidized nanoscale zerovalent iron (SNZVI) used to remediate groundwater has not been…
View article: Microplastics attenuation from surface water to drinking water: Impact of treatment and managed aquifer recharge – and identification uncertainties
Microplastics attenuation from surface water to drinking water: Impact of treatment and managed aquifer recharge – and identification uncertainties Open
River water can be used to recharge aquifers exploited for drinking water production. Several recent studies reported microplastics (MPs) in river water, and therefore, the potential contamination of groundwater by MPs is a growing concern…
View article: Formation and transformation of Fe(III)- and Ca-precipitates in aqueous solutions and effects on phosphate retention over time
Formation and transformation of Fe(III)- and Ca-precipitates in aqueous solutions and effects on phosphate retention over time Open
Exfiltration of anoxic phosphate-rich groundwater into surface water leads to the oxidation of dissolved Fe(II) and the formation of Fe(III)-precipitates that can retain phosphate (PO4) and thereby attenuate eutrophication. Fres…
View article: Nanoparticles Are Everywhere, Even Inside Trees
Nanoparticles Are Everywhere, Even Inside Trees Open
View article: Formation and aging of Fe(III) and Ca precipitates in exfiltrating anoxic groundwater and effects on phosphate retention
Formation and aging of Fe(III) and Ca precipitates in exfiltrating anoxic groundwater and effects on phosphate retention Open
The oxidation of dissolved Fe(II) upon exfiltration of anoxic groundwaters into oxic surface waters leads to precipitation of poorly crystalline Fe(III)-solids that strongly bind phosphate (PO4) and thereby can attenuate eutrophication. Fr…
View article: Competitive incorporation of Mn and Mg in vivianite at varying salinity and effects on crystal structure and morphology
Competitive incorporation of Mn and Mg in vivianite at varying salinity and effects on crystal structure and morphology Open
Vivianite, a ferrous phosphate mineral, can be an important phosphorus (P) sink in non-sulfidic, reducing coastal sediments. The Fe in the crystal structure of vivianite can be substituted by other divalent metal cations such as Mn2+ or Mg…
View article: Phosphate co-precipitation with Fe(III) during Fe(II) oxidation: Effects of dissolved organic compounds
Phosphate co-precipitation with Fe(III) during Fe(II) oxidation: Effects of dissolved organic compounds Open
View article: Transport of double-stranded ribonucleic acids (dsRNA) and deoxyribonucleic acids (DNA) in sand and iron oxide-coated sand columns under varying solution chemistries
Transport of double-stranded ribonucleic acids (dsRNA) and deoxyribonucleic acids (DNA) in sand and iron oxide-coated sand columns under varying solution chemistries Open
Assessing ecological risks associated with the use of genetically modified RNA interference crops demands an understanding of the fate of crop-released insecticidal double-stranded RNA (dsRNA) molecules in soils.
View article: Revisiting the Strategy for Marine Litter Monitoring within the European Marine Strategy Framework Directive (Msfd)
Revisiting the Strategy for Marine Litter Monitoring within the European Marine Strategy Framework Directive (Msfd) Open
View article: First evidence of nanoparticle uptake through leaves and roots in beech (<i>Fagus sylvatica</i> L.) and pine (<i>Pinus sylvestris</i> L.)
First evidence of nanoparticle uptake through leaves and roots in beech (<i>Fagus sylvatica</i> L.) and pine (<i>Pinus sylvestris</i> L.) Open
Trees have been used for phytoremediation and as biomonitors of air pollution. However, the mechanisms by which trees mitigate nanoparticle pollution in the environment are still unclear. We investigated whether two important tree species,…
View article: Separation of Microplastic Particles from Sewage Sludge Extracts Using Magnetic Seeded Filtration
Separation of Microplastic Particles from Sewage Sludge Extracts Using Magnetic Seeded Filtration Open
View article: Coexisting Goethite Promotes Fe(II)-Catalyzed Transformation of Ferrihydrite to Goethite
Coexisting Goethite Promotes Fe(II)-Catalyzed Transformation of Ferrihydrite to Goethite Open
In redox-affected soil environments, electron transfer between aqueous Fe(II) and solid-phase Fe(III) catalyzes mineral transformation and recrystallization processes. While these processes have been studied extensively as independent syst…
View article: Nanoplastics removal during drinking water treatment: Laboratory- and pilot-scale experiments and modeling
Nanoplastics removal during drinking water treatment: Laboratory- and pilot-scale experiments and modeling Open