Direct measurements of D/H and 18O/16O fractionation factors between vapor and liquid water in the temperature range from 10 to 40.DEG.C.

Kakiuchi, Masahisa; Matsuo, Sadao

doi:10.2343/geochemj.13.307

Cited by 58 publications

(32 citation statements)

References 13 publications

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“…It is interesting to note that analogous y values for partial molar enthalpies and partial molar volumes are also in the range 1.90 to 1.95 (FENBY and CHAND, 1978;DUTTA-CHOUDHURY and VAN HOOK, 1980). We conclude that the results of KAKIUCHI and MATSUO (1979) are in satisfactory agreement with the available vapor pressure data on D2O and with the statistical theory of isotope effects in condensed phases.…”

Section: Comparison With Experimentssupporting

confidence: 78%

“…For 180/160 effects the calculated difference at 32°, 6 ± 2 X 10-4 unit, is in satisfactory agreement with the observed differences between the smoothed lna measurements of KAKIUCHI and MATSUO (1979) or M AJOUBE (1971) (which are within 0.0001 unit of each other) and the JAKLI and STASCHEWSKI (1977) or SZAPIRO and STECKEL (1967) In R measurements; (lna 1nR)exptl = 4 ± 1 X 10-4 unit.…”

Section: Comparison With Experimentssupporting

confidence: 69%

“…The H/D vapor pressure ratios can be recovered from equation 1 using an expression presented by VAN HOOK (1972) for the ratio y = (ln RDOD /ln RHOD ), or (to sufficient precision) from the raw data presented by KAKIUCHI and MATSUO. 180/160 vapor pressure ratios can similarly be obtained from KAKIUCHi and MATSUO (1979) or other sources. In this fashion it is readily shown that the molar volume correction, RT (1 p,) is negligible (< 1 X 10-5) compared to the experi mental error (which we take as ± 1 X 10-4) over the temperature range 10 to 40'C.…”

Section: Parisons Between Their Measured Ina Valuesmentioning

confidence: 99%

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D/H and 18O/16O fractionation factors between vapor and liquid water.

Jákli

Hook

1981

Geochem. J.

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Analysis of the data of KAKIUCHI and MATASUO (1979) and other work on H/D fractionation factors for water(liq) F water(vapor) verifies earlier observations of the ratio, 1nRDOD/1nRHOD = 7 = 1.91 ± 0.02, (1nRDOD = ln(PHOH/PDOD), 1nRHOD = ln(PHOH/PHOD)). Analysis of KM's data on 180/ 160 fractionation according to the method of JANCSO and VAN HOOK (1978a) shows good agreement between fractionation factors and measurements of vapor pressures of separated isotopes. A significant volume dependence for the high frequency OH stetching motions in water is verified.

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Section: Comparison With Experimentssupporting

confidence: 78%

Section: Comparison With Experimentssupporting

confidence: 69%

Section: Parisons Between Their Measured Ina Valuesmentioning

confidence: 99%

See 1 more Smart Citation

D/H and 18O/16O fractionation factors between vapor and liquid water.

Jákli

Hook

1981

Geochem. J.

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“…For instance, variations of 18 O/ 16 O and D/H in water and ice cores are important indicators of present and past hydrologic processes and climate [1]. Between pure liquid water and its vapour in equilibrium, the heavier isotopes of oxygen, 18 O, and hydrogen, D, are both preferentially fractionated into the liquid phase and the lighter ones, 16 O and H, into the vapour (vapour pressure isotope effects of water) [2,3]. Even if salt is added to the liquid phase, the direction of the 18 O/ 16 O and D/H isotope fractionations does not change, but the degrees of the fractionation change depending on the kind of salt added and its concentration (isotope salt effects) [4 -7].…”

Section: Introductionmentioning

confidence: 99%

Oxygen and Hydrogen Isotopic Preference in Hydration Spheres of Magnesium and Calcium Ions

Sato²,

Umemoto³

2013

Zeitschrift Für Naturforschung A

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Molecular orbital calculations were performed to estimate the 18 O/ 16 O and D/H isotopic reduced partition function ratios (rpfrs) of water molecules around magnesium and calcium ions. As model for water molecules in the ith hydration sphere of the cation in aqueous solutions containing that cation, we considered water molecules in the ith hydration sphere that were surrounded by water molecules in the (i+1)th hydration sphere in clusters, M 2+ (H 2 O) n (M = Mg or Ca; n up to 100). The calculations indicated that the decreasing order of the 18 O preference over 16 O in the primary hydration sphere is Mg 2+ > Ca 2+ > bulk water. That is, water molecules in the primary hydration spheres of the Mg 2+ and Ca 2+ ions are expected to be enriched in the heavier isotope of oxygen relative to water molecules in bulk, and the degree of the enrichment is larger for the Mg 2+ ion than for the Ca 2+ ion. No such preference was observed for hydrogen isotopes in any hydration sphere or for oxygen isotopes in the secondary and outer hydration spheres.

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“…Between pure liquid water and its vapour in equilibrium, the heavier isotopes of oxygen, 18 O, and hydrogen, D, are both preferentially fractionated into the liquid phase and the lighter ones, 16 O and H, into the vapour (vapour pressure isotope effects of water) [1,2]. Even if salt is added to the liquid phase, the direction of the 18 O/ 16 O and D/H isotope fractionations does not change, but the degrees of the fractionation change depending on the kind of salt added and its concentration (isotope salt effects) [3 -6].…”

Section: Introductionmentioning

confidence: 99%

¹⁸O/¹⁶O and D/H Isotopic Preference in Hydration Spheres of Alkali Metal Ions

2011

Zeitschrift Für Naturforschung A

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With the final goal set at theoretical elucidation of experimentally observed isotope salt effects, molecular orbital calculations were performed to estimate the 18 O/ 16 O and D/H isotopic reduced partition function ratios (RPFRs) of water molecules around lithium, sodium, and potassium ions. As model water molecules in the ith hydration sphere of the cation in aqueous solutions containing that cation, we considered water molecules in the ith hydration sphere that were surrounded by water molecules in the (i + 1)th hydration sphere in clusters, M + (H 2 O) n ( M = Li, Na or K; n up to 100). The calculations indicated that the decreasing order of the 18 O preference over 16 O in the primary hydration sphere is: Li + > (bulk water) ≥ Na + > K + . That is, water molecules in the primary hydration spheres of the Li + , Na + , and K + ions are, respectively, enriched, slightly depleted, and depleted in the heavier isotope of oxygen relative to water molecules in bulk. No such preference was observed for hydrogen isotopes in any hydration sphere or for oxygen isotopes in the secondary and outer hydration spheres.

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Direct measurements of D/H and 18O/16O fractionation factors between vapor and liquid water in the temperature range from 10 to 40.DEG.C.

Cited by 58 publications

References 13 publications

D/H and 18O/16O fractionation factors between vapor and liquid water.

D/H and 18O/16O fractionation factors between vapor and liquid water.

Oxygen and Hydrogen Isotopic Preference in Hydration Spheres of Magnesium and Calcium Ions

¹⁸O/¹⁶O and D/H Isotopic Preference in Hydration Spheres of Alkali Metal Ions

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Direct measurements of D/H and 18O/16O fractionation factors between vapor and liquid water in the temperature range from 10 to 40.DEG.C.

Cited by 58 publications

References 13 publications

D/H and 18O/16O fractionation factors between vapor and liquid water.

D/H and 18O/16O fractionation factors between vapor and liquid water.

Oxygen and Hydrogen Isotopic Preference in Hydration Spheres of Magnesium and Calcium Ions

18O/16O and D/H Isotopic Preference in Hydration Spheres of Alkali Metal Ions

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¹⁸O/¹⁶O and D/H Isotopic Preference in Hydration Spheres of Alkali Metal Ions