It has long been hypothesized that acids formed from anthropogenic pollutants and natural emissions dissolve iron (Fe) in airborne particles, enhancing the supply of bioavailable Fe to the oceans. However, field observations have yet to provide indisputable evidence to confirm this hypothesis. Single-particle chemical analysis for hundreds of individual atmospheric particles collected over the ...

caused by the nature of the parent material and also by leaching in the course of soil formation. f ) Iron. For Japanese paddy soils one percent of active Fe20 l as determined with Mg-ribbon reduction method is critical. Below this value unfavorable effects on the growth of rice may be expected. This threshold value has been adopted for the results of iron determination with a phoco-chemical re...

High-precision iron isotopic compositions for Fe-bearing geological reference materials and chondrites with a wide range of matrices (e.g., silicates, oxides, organic-bearing materials) are reported. This comprehensive data set should serve as a reference for iron isotopic studies across a range of geological and biological disciplines for both quality assurance and inter-laboratory calibration...

Polychlorinated benzenes, dibenzo-p-dioxins (PCDD), and dibenzofurans (PCDF) may be formed below the combustion temperature in fly ash from municipal solid waste incinerators (MSWI). Copper catalyzes this formation, possibly by the Deacon reaction. Many other elements are also Deacon catalysts or promoters, and here we report results from a statistically designed experiment with 15 metal oxides...

this study mainly concentrates on metallurgical structure of the ferrous ancient crafts, specially the discovered ferrous man-made pieces in ilam which are aged more than 3000 years. the pieces were discovered in ize a town located in the south east of ahvaz , in the southern of iran. the crafts include an ferrous bar, a 3-side and a 4 side bayonets which were microscopically studied by electro...

Using laboratory methods, we investigate the effect of the presence and mineralogic form of iron on measured proton nuclear magnetic resonance NMR relaxation rates. Five samples of quartz sand were coated with ferrihydrite, goethite, hematite, lepidocrocite, and magnetite. The relaxation rates for these iron-oxide-coated sands saturated with water were measured and compared to the relaxation ra...

Abstract Iron alloying of oxidic cobaltate catalysts results in catalytic activity for oxygen evolution on par with Ni-Fe oxides base but at much higher compositions. Zero-field 57 Fe Mössbauer spectroscopy and X-ray absorption (XAS) are able to clearly identify 4+ mixed-metal Co-Fe oxides. The highest population is obtained the 40–60% range, XAS identifies ion residing an octahedral oxide liga...

After consumption of molecular oxygen, anaerobic microbial communities can use a continuum of alternative electron acceptors such as nitrate, manganese oxides, iron oxides, sulfate or CO2, with decreasing spans of available free energy. The electron transfer to insoluble metal oxides or to partner organisms such as methanogens may require the employment of electron carrier systems such as soil ...