Hydrogen and oxygen isotope fractionation during crystallization of mirabilite and ice |
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Authors: | Michael K Stewart |
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Institution: | Department of Geology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, U.S.A. |
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Abstract: | The equilibrium fractionation factors between mirabilite (Na2SO4·10H2O) and saturated sodium sulphate solution at 25°C and 0°C and between ice and 2·5 molal sodium chloride solution at ?10°C have been measured. For mirabilite, the deuterium factors are 1·017 and 1·019, and the oxygen-18 factors are 1·0014 and 1·0020 at 25°C and 0°C, respectively. For ice, the factors are 1·024 for deuterium and 1·0022 for oxygen-18 at ?10°C. These fractionation factors are used to estimate the fractionation factors between ice and mirabilite and concentrated sea water at ?10°C. It is concluded that the average binding strengths of hydrogen in ice and mirabilite are very similar. |
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