The influence of aqueous silica on the hydrolysis of iron(III) nitrate and chloride salts in dilute aqueous solutions (mFe 0.01 mol/kg) was studied at ambient temperature using X-ray absorption fine structure (XAFS) spectroscopy at the Fe K-edge. Results show that in Si-free iron nitrate and chloride solutions at acid pH (pH 2.5), Fe is hexa-coordinated with 6 oxygens of H2Oand/or OH-groups in ...

Abstract The use of by-products and recyclable materials in the production concrete has become an interesting alternative to mitigate environmental impacts, especially those generated by construction industry, as long their mechanical durability properties do not early compromise service life structures. resistance penetration harmful agents, such chloride ions, is important property since it d...

The results of an investigation evaluating the feasibility of using optical measurements for the real-time monitoring of fluid properties in geothermal process streams is described. The measurements exploit new technologies that have been developed for the telecommunications industry and include new solid state laser devices, large-bandwidth, high-sensitivity detectors and low loss optical fibe...