We are familiar with large highly-ordered single crystals, such as those used in the semiconductor industry. There the crystalline ordering in the silicon crystals extends for billions and more lattice spacings. As a result, X-ray diffraction (XRD) patterns of these crystals have sharp Bragg peaks. We are also familiar with liquids, where the molecules have a local structure that is very differ...

The potential of microbial mediated iron plaque reduction, and associated arsenic (As) mobility were examined by iron reducing bacteria enriched from As contaminated paddy soil. To our knowledge, this is the first time to report the impact of microbial iron plaque reduction on As mobility. Iron reduction occurred during the inoculation of iron reducing enrichment culture in the treatments with ...

Humic acids (HA) have a colloidal character whose size and negative charge are strictly dependent on surface functional groups. They are able to complex large amount of poorly ordered iron (hydr)oxides in soil as a function of pH and other environmental conditions. Accordingly, with the present study we intend to assess the colloidal properties of Fe(II) coprecipitated with humic acids (HA) and...

In this study, we compared the high-energy resolution X-ray fluorescence absorption near-edge structure (HERFD-XANES) and normal XANES spectra of various iron (Fe) species Fe in atmospheric aerosol samples to explore advantages K-edge HERFD-XANES for speciation aerosols using linear combination fitting (LCF) spectra. We also conducted extraction experiments validate LCF-XANES. spectra, pre-edge...

Investigating uranium migration mechanisms related to the weathering of waste rocks is essential for developing strategies that can address potential environmental issues caused by mining. This work based on samples containing 2 L ferrihydrite, lepidocrocite and goethite collected in technosols from granitic rock piles, mine drainage conduits waters. The results show important role iron oxyhydr...

We characterized the most As-rich natural hydrous ferric oxide (HFO) material ever reported using powder X-ray diffraction (pXRD), transmission electron microscopy (TEM), X-ray fluorescence spectroscopy (XRF), light element analysis using gas chromatography (GC), visible-infrared (vis-IR) diffuse reflectivity, Fe Mössbauer spectroscopy, and superconducting quantum interference device (SQUID) ma...