[en] Highlights: • Solubility limits of chromium in silicate melts are given for a wide fO₂ range. • Diffusivity of multivalent chromium were determined by square wave voltammetry. • Basicity and viscosity of the silicates affects the corrosion behavior of NiCr alloy. • Dissolution of Cr₂O₃ is kinetically limited by the diffusion of Cr in silicates.

[en] An absorption spectrometry coupled with flow injection analysis has been developed and tested for the analysis of the Cr₂O₇^2-/MnO₄^- mixtures. Even though one has to inject the sample twice into the FIA system and the process of the sample treatment is required to completely destroy the MnO₄^- ion for the analysis of the Cr₂O₇^2- ion, the new method has definite advantages over the current method. It utilizes only a single analytical wavelength (570 nm) and enables one to construct calibration curves which accurately follow the Bee's law over wide ranges of analytical concentrations of both ions (2.0x10^-6 M∼8.0x10^-3 M for Cr₂O₇^2- ion, 2.0x10^-6 M∼4.0x10^-3 M for MnO₄^- ion)

[en] Published in summary form only

No abstract available

[en] Six column experiments were performed and seven breakthrough curves (BTCs) and seven displacement (desorption) curves (DPCs) of phosphate and U(VI) were obtained, which demonstrated the effects of phosphate and Cr³⁺ on the sorption and transport of U(VI) on a silica column at pH 3 and uranium concentration 10^-5-10^-6 mol/L of the influent. It was found that in the presence of phosphate sorbed preliminarily on the silica column, the amount of U(VI) sorbed on this column is significantly increased owing to the interaction of U(VI) with phosphate sorbed as compared with that in the absence of phosphate, and the breakthrough and the mean residence time of U(VI) on this column are similar to those in the absence of phosphate. While the effect of simultaneous injection of Cr³⁺ on the retardation of U(VI) on the silica column, the maximum concentration of BTC and the amount of U(VI) sorbed was found to be insignificant. Transport and sorption studies of U(VI) are important, since all uranium isotopes are radioactive, there is a need to understand the potential for migration away from radioactive waste storage and mill tailing sites. (author)

[en] The branch-like, feather-like BaCrO_4 nano-superstructures were synthesized with bioactive eggshell membrane as directing and assembly template. Studies on the two products revealed that they formed through the self-assembly of nanoparticles, and that the optical properties of the products were different from BaCrO_4 bulk materials

[en] Published in summary form only

[en] In this paper the third-rank chromatic aberration coefficients of round electron lenses are analytically derived and numerically calculated by Mathematica. Furthermore, the numerical results are cross-checked by the differential algebraic (DA) method, which verifies that all the formulas for the third-rank chromatic aberration coefficients are completely correct. It is hoped that this work would be helpful for further chromatic aberration correction in electron microscopy.

No abstract available

[en] Calorimetric measurements of the enthalpies of reaction of Cs₂CrO₄ with aqueous nitric acid and of Cs₂Cr₂O₇ with aqueous cesium hydroxide gave a mean value for the standard enthalpy of formation of cesium dichromate: ΔH⁰sub(f)(Cs₂Cr₂O₇, c, 298.15 K) = -(499.79 +- 0.68) kcalsub(th) mol^-1. Standard enthalpies of formation of Na₂Cr₂O₇ and K₂Cr₂O₇ have been recalculated from published results to be -(473.71 +- 0.92) and -(493.3 +- 0.8) kcalsub(th) mol^-1, respectively, and ΔH⁰sub(f)(Rb₂Cr₂O₇, c, 298.15 K) has been estimated to be -(492.0 +- 2.6) kcalsub(th) mol^-1. Measurements of the enthalpy of solution of CsNO₃ in HNO₃(aq) suggest the need for additional studies of the enthalpy of dilution of CsNO₃(aq). (author)