Publications by authors named "Jessica A Stammeier"
Organic phosphates (OP) are important nutrient components for living cells in natural environments, where they readily interact with ubiquitous iron phases such as hydrous ferric oxide, ferrihydrite (FHY). FHY partakes in many key bio(geo)chemical reactions including iron-mediated carbon storage in soils, or iron-storage in living organisms. However, it is still unknown how OP affects the formation, structure and properties of FHY.
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- The study focuses on how chromium (Cr) leached from iron-rich tropical laterites affects groundwater and ecosystems, highlighting a lack of effective methods for extracting and analyzing Cr in laterites.* -
- Researchers optimized a new Cr-specific sequential extraction procedure (SEP) that outperforms existing methods by better isolating and measuring Cr in Fe (oxyhydr)oxide-rich laterites.* -
- The new SEP showed up to seven times higher recovery of Cr, leading to improved understanding of its environmental impacts in tropical soils.*
We undertook Sr/Sr analyses for a range of carbonate bearing geological reference materials, and combined these with δMg for a subset of samples. Following chemical purification in a series of chromatographic extractions, isotope ratios were measured by Multi-Collector-ICP-MS using a Plasma II (Nu instruments, Wrexham, UK). To validate efficient sample digestion procedures of carbonate fractions, total samples were treated with either 3 mol l HNO and 0.
View Article and Find Full Text PDFAmorphous calcium phosphate (Ca(PO)xnHO; n = 3-4.5; ACP) is a precursor phase of the mineral hydroxyapatite (Ca(PO)(OH); HAP) that in natural settings occurs during both authigenic and biogenic mineral formation. In aqueous solutions ACP transforms rapidly to the crystalline phase.
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