Solution Speciation Controls Mercury Isotope Fractionation of Hg(II) Sorption to Goethite

Three Isotope Method Determination of the Equilibrium Fe Isotope Fractionation between Aqueous Fe(ii) and Goethite

FRACTIONATION BETWEEN AQUEOUS FE(II) AND GOETHITE. B. L. Beard and R. Handler, M. M. Scherer, L. Wu, A. D. Czaja, A. Heimann, C. M. Johnson Department of Geosciences, 1215 W. Dayton Street, University of Wisconsin, Madison, WI 53706, USA, NASA Astrobiology Institute, University of Wisconsin, 3 Dept of Civil and Environmental Engineering, The University of Iowa, 4126 Seamans Center for the Engin...

Stable Oxygen and Hydrogen Isotope Fractionation Factors for the Goethite (hematite)-water System

This paper reports experimental results on the low-temperature (<100 oC) 18O and  2H fractionation of goethite (hematite)-water in a closed system. Both goethite (-FeOOH) and hematite (-Fe2O3) exhibited closer fractionation factor values but the Hematite-Water value is slightly higher (~0.9932) than the Goethite-Water (~0.9924) for the 18O isotope. The average fractionation factor (1000ln...

Isotope Effects, Isotope Separation and Isotope Fractionation

Study of the radium sorption/desorption on goethite

The oxi-hydroxides, present at trace level in uranium mill tailings, are responsible of about 70% of the 226 radium sorption, half being fixed on crystallized forms. This radionuclide (half time = 1622y), present at high level (50 to 100kBq.kg), can be released in groundwater, involving a possible contamination of the food chain (actual concentration limit = 0.37Bq.l). So, it is very important ...

Wavelength dependence of isotope fractionation

Wavelength dependence of isotope fractionation in N2O photolysis J. Kaiser, T. Röckmann, C. A. M. Brenninkmeijer, and P. J. Crutzen 3 Abteilung Chemie der Atmosphäre, Max-Planck-Institut für Chemie, Mainz, Germany Bereich Atmosphärenphysik, Max-Planck-Institut für Kernphysik, Heidelberg, Germany Center for Atmospheric Sciences, Scripps Institution of Oceanography, University of California, San ...