A5063481408- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Radioactive element chemistry and processing
- Radioactive contamination and transfer
- Geochemistry and Elemental Analysis
- Lanthanide and Transition Metal Complexes
- Radioactivity and Radon Measurements
- Magnetism in coordination complexes
- Genomics and Phylogenetic Studies
- Selenium in Biological Systems
- Geochemistry and Geologic Mapping
- Groundwater flow and contamination studies
- Polyoxometalates: Synthesis and Applications
- Coal and Its By-products
- Mercury impact and mitigation studies
- Microbial Community Ecology and Physiology
- Nuclear materials and radiation effects
- Metabolomics and Mass Spectrometry Studies
- Metal complexes synthesis and properties
- Microbial Fuel Cells and Bioremediation
- Chemical Synthesis and Characterization
- Crystallography and molecular interactions
University of Helsinki
2021-2024
University of Manchester
2016-2023
Following our report of the first near-linear lanthanide (Ln) complex, [Sm(N††)2] (1), herein we present synthesis [Ln(N††)2] [N†† = {N(SiiPr3)2}; Ln Eu (2), Tm (3), Yb (4)], thus achieving approximate uniaxial geometries for a series "traditional" LnII ions. Experimental evidence, together with calculations performed on model 4, indicates that dispersion forces are important stabilization 1-4. The isolation 3 under dinitrogen atmosphere is noteworthy, given "[Tm(N″)(μ-N″)]2" (N″...
As the dominant radionuclide by mass in many radioactive wastes, control of uranium mobility contaminated environments is high concern. U speciation can be governed microbial interactions, whereby metal-reducing bacteria are able to reduce soluble U(VI) insoluble U(IV), providing a method for removal from groundwater. Although reduction widely reported, mechanism(s) transformation relatively U(IV) phases poorly understood. By combining suite analyses, including luminescence, M4-edge...
The introduction of (N
Flow-through columns were used to assess potential long-term trends in 90Sr biogeochemistry and transport a Finnish near-surface very low-level waste (VLLW) repository concept. Experiments simulated the effects of water intrusion flow through barrier backfill materials, examining impacts on migration. Artificial rainwater containing 2.0 mg/L stable Sr (as proxy for 90Sr) was pumped column systems that had varying compositions from matrix rock flour (backfill material), bentonite...
This is the first comprehensive study to compare long term stability of U and Sr (bio)remediation end-points following oxidative remobilisation ( via oxygen/nitrate) yielding insights into retention capabilities removal mechanisms.
A non-axenic culture of Pseudanabaena catenata, a close relative the bloom-forming cyanobacterium found in high pH First Generation Magnox Storage Pond (FGMSP) at Sellafield Nuclear Facility, was supplemented with 1 mM SrCl2, to determine its effect on fate Sr. The addition Sr P. catenata resulted ~16 % reduction overall growth (OD600nm) and 21 concentration chlorophyll-a (Chl-a) compared those without assessed using multi-technique approach. Inductively coupled plasma atomic emission...
Selenium (Se) is a toxic contaminant with multiple anthropogenic sources, including 79Se from nuclear fission. Se mobility in the geosphere generally governed by its oxidation state, therefore understanding speciation under variable redox conditions important for safe management of contaminated sites. Here, we investigate behavior sediment groundwater column systems. Experiments were conducted environmentally relevant concentrations, using range compositions, and impact electron-donor (i.e.,...
Pseudomonas sp. are indigenous inhabitants of ombrotrophic bogs which can survive in acidic, nutrient-poor environments with wide temperature fluctuations. Their interactions contaminant radionuclides influence radionuclide biogeochemistry boreal environment. Here, uranium (U(VI)) bioassociation by PS-0-L, V4-5-SB and T5-6-I isolated from a bog was studied combination batch contact experiments, spectroscopy microscopy. All strains removed U the solution efficiency affected nutrient source,...
The deep terrestrial subsurface (DTS) harbours a striking diversity of microorganisms. However, systematic research on microbial metabolism, and how varying groundwater composition affects the bacterial communities metabolites in these environments is lacking. In this study, DTS consortia from two Fennoscandian Shield sites were enriched studied. We found that consisted distinct taxa, alterations growth medium induced changes cell counts. lack an exogenous organic carbon source (ECS) caused...
Uranium dioxide (UO2) and metaschoepite (UO3•nH2O) particles have been identified as contaminants at nuclear sites. Understanding their behavior impact is crucial for safe management of radioactively contaminated land to fully understand U biogeochemistry. The Savannah River Site (SRS) (South Carolina, USA), one such site, following historical releases U-containing wastes the vadose zone. Here, we present an insight into these two particle types under dynamic conditions representative SRS,...
99Tc will be present in significant quantities radioactive wastes including intermediate-level waste (ILW). The internationally favored concept for disposing of higher activity ILW is via deep geological disposal an underground engineered facility located ∼200–1000 m deep. Typically, the environment, subsurface saturated, cement used extensively as engineering material, and iron ubiquitous. This means that understanding Tc biogeochemistry high pH, cementitious environments important to...