Depth profiles potassium and its isotope ratio (K/K) were investigated in several forest soils from different geological and climatic backgrounds. The ratio was found not to be constant (0.0117 %) but varied appreciably from 0.0085 to 0.0167 % among different soils. Possible factors affecting variability of K/K values were considered by a multivariate factor analysis which suggested that aqueou...

the method of weights of evidence is one of the most important data driven methods for mineral potential mapping in gis. in this method, considering the characteristics of known mineralized locations, we can prospect new mineralized areas. in this research work, the method of weights of evidence has been used for hydrothermal gold potential mapping in torbat-e-heydarieh area, east of iran. as a...

Abstract Nanotechnology has been evolving in the past decades as an alternative to conventional fertilizers. Ferrihydrite nanoparticles that model available Fe pool of soils are proposed be used recover deficiency plants. Nevertheless, ferrihydrite aqueous suspensions known undergo slow transformation a mixture goethite and hematite, which may influence its biological availability. Several nano...

Abstract. The iron-oxide content of dust in the atmosphere and most notably its apportionment between hematite (α-Fe2O3) goethite (α-FeOOH) are key determinants quantifying dust's light absorption, top ultraviolet (UV) radiances used for monitoring, ultimately shortwave direct radiative effects (DREs). Hematite column mass concentrations fractions total concentration were retrieved from Deep Sp...

In this study, tribological properties of custom formulated and stabilized nano lubricant are investigated. Spherical CuO nanoparticles suspended in 20W-50 mineral base using Oleic Acid (OA) as a surfactant. Three different concentrations with 0.2, 0.5, 1 wt.% were analyzed through ASTM G-99 pin-on-disc tribometer standardized test under boundary/mixed lubrication regimes. The generated frictio...

Manganese (Mn) oxides, which are generally considered biogenic in origin within natural systems, are the only oxidants of Cr(iii) under typical environmental conditions. Yet the influence of Mn biooxide mineral structural evolution on Cr(iii) oxidation under varying geochemical conditions is unknown. In this study we examined the role of light, organic carbon, pH, and the structure of biogenic ...