Vapor Pressure Studies Involving Solutions in Light and Heavy Waters. III. TheSeparation Factor for the Isotopes of Hydrogen during Distillation from Salt Solutions in the Mixed Waters at Room Temperature

Googin, J.M.; Smith, Hilton A.

doi:10.1021/j150549a015

Cited by 18 publications

(2 citation statements)

References 1 publication

(2 reference statements)

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“…The oxygen isotopic composition of the water was measured via the CO 2 ‐equilibrium method by Epstein and Mayeda [1953] with a Finnigan MAT 252 mass spectrometer at the University of Tokyo, Japan. Although ion hydration resulting from the presence of dissolved salts in the sample can affect the 18 O/ 16 O activity ratio of the water during sample preparation [ Googin and Smith , 1957], Horita et al [1993] documented that NaCl has no measurable effects on the measured oxygen isotope ratio using the CO 2 ‐equilibrium technique. The hydrogen isotopic composition was measured by Cr‐reduction [ Gehre et al , 1996] with an automated hydrogen preparation system (Finnigan H/Device on line with the MAT 252).…”

Section: Methodsmentioning

confidence: 99%

Effect of massive gas hydrate formation on the water isotopic fractionation of the gas hydrate system at Hydrate Ridge, Cascadia margin, offshore Oregon

Tomaru

Torres

Matsumoto

et al. 2006

Geochem Geophys Geosyst

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[1] Because gas hydrate is preferentially enriched in the heavy water isotopes, the d 18 O and dD values of pore waters collected from gas hydrate-bearing sediment can provide information on the abundance and mechanisms of gas hydrate formation. Pore waters sampled from deep-seated (40 to 125 mbsf) gas hydrate deposits in Hydrate Ridge during ODP Leg 204 show depletion in dissolved Cl À and enrichments in 18 O and D due to gas hydrate destabilization during core recovery. The oxygen and hydrogen isotopic fractionation factors (a O = 1.0025 and a H = 1.022) estimated from an extensive data set (n = 30 samples) correspond to experimentally determined values. In contrast, pore waters from shallow samples (<25 mbsf) at the ridge summit (n = 32) are highly enriched in dissolved Cl À and depleted in 18 O and D, consistent with formation of massive gas hydrate deposits at rates faster than those at which these anomalies would be removed by advection or diffusion. The water isotopic fractionation factors in the brine are significantly lower than those experimentally determined, with a O of 1.0010 (average value of 1.0012) and a H of 1.008 (average value of 1.008). We discuss several factors that may be causing this anomalous fractionation and suggest that low gas occupancy in hydrate lattice (high hydration number) may be responsible for the observed small fractionation. If this were the case, the oxygen and hydrogen fractionation may serve as an indicator of hydration number during formation of gas hydrate in natural systems. Tomaru, H., M. E. Torres, R. Matsumoto, and W. S. , Effect of massive gas hydrate formation on the water isotopic fractionation of the gas hydrate system at Hydrate Ridge,

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Section: Methodsmentioning

confidence: 99%

Effect of massive gas hydrate formation on the water isotopic fractionation of the gas hydrate system at Hydrate Ridge, Cascadia margin, offshore Oregon

Tomaru

Torres

Matsumoto

et al. 2006

Geochem Geophys Geosyst

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“….. The various isotope effects on the excess entropies are found by combining eq [11][12][13] and 16 according to…”

Section: Methodsmentioning

confidence: 99%

Vapor pressure isotope effect in aqueous systems. I. Water-water-d2 (-64.deg. to 100.deg.) and water-water18-0 (-17.deg. to 16.deg.). Ice and liquid. II. Alkali metal chloride solution in water and water-d2 (-5.deg. to 100.deg.)

Pupezin¹,

Jákli²,

Jancsó³

et al. 1972

J. Phys. Chem.

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Salt effect in distillation: A literature review II

Furter

1977

Can J Chem Eng

100

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A salt dissolved in a mixed solvent is capable, through preferential association or other structure‐related effects in the liquid phase, of altering the composition of the equilibrium vapor phase. Hence salt effect on vapor‐liquid equilibrium relationships provides a potential technique of extractive distillation for difficult separations. The literature pertaining to salt effect in vapor‐liquid equilibrium and in extractive distillation over the period 1966‐present is reviewed, and also the remainder of work up to 1966 not covered in the Part I review.

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Vapor Pressure Studies Involving Solutions in Light and Heavy Waters. III. TheSeparation Factor for the Isotopes of Hydrogen during Distillation from Salt Solutions in the Mixed Waters at Room Temperature

Cited by 18 publications

References 1 publication

Effect of massive gas hydrate formation on the water isotopic fractionation of the gas hydrate system at Hydrate Ridge, Cascadia margin, offshore Oregon

Effect of massive gas hydrate formation on the water isotopic fractionation of the gas hydrate system at Hydrate Ridge, Cascadia margin, offshore Oregon

Vapor pressure isotope effect in aqueous systems. I. Water-water-d2 (-64.deg. to 100.deg.) and water-water18-0 (-17.deg. to 16.deg.). Ice and liquid. II. Alkali metal chloride solution in water and water-d2 (-5.deg. to 100.deg.)

Salt effect in distillation: A literature review II

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