Activities and concentrations of oxygen-18 in concentrated aqueous salt solutions: Analytical and geophysical implications

Z. Sofer; J. R. Gat

doi:10.1016/0012-821X(72)90168-9

Activities and concentrations of oxygen-18 in concentrated aqueous salt solutions: Analytical and geophysical implications

Z. Sofer, J. R. Gat

Research output: Contribution to journal › Article › peer-review

212 Scopus citations

Abstract

The conventional procedure for analysis of ¹⁸O in aqueous solutions yield δ ¹⁸O values on an activity scale rather than a value for the isotope concentration. Conversion between the two scales in natural chloridic solutions containing magnesium, calcium and potassium is given by the equation (δ₀ - δ_m)/(1000 + δ_m) × 10³ = 1.11 M_Mg + 0.47 M_Ca - 0.16 M_K, where δ₀ is the δ value on a concentration scale, δ_m the measured activity delta and M the molality. This linear equation holds up to molalities of 6 in pure and mixed salt solutions. The correction is of significance for a variety of geochemical processes, among them the use of the isotope content of different brines as an indicator of the salinization mechanisms of water sources.

Original language	English
Pages (from-to)	232-238
Number of pages	7
Journal	Earth and Planetary Science Letters
Volume	15
Issue number	3
DOIs	https://doi.org/10.1016/0012-821X(72)90168-9
State	Published - 1 Jan 1972
Externally published	Yes

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Space and Planetary Science
Earth and Planetary Sciences (miscellaneous)

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10.1016/0012-821X(72)90168-9

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title = "Activities and concentrations of oxygen-18 in concentrated aqueous salt solutions: Analytical and geophysical implications",

abstract = "The conventional procedure for analysis of 18O in aqueous solutions yield δ 18O values on an activity scale rather than a value for the isotope concentration. Conversion between the two scales in natural chloridic solutions containing magnesium, calcium and potassium is given by the equation (δ0 - δm)/(1000 + δm) × 103 = 1.11 MMg + 0.47 MCa - 0.16 MK, where δ0 is the δ value on a concentration scale, δm the measured activity delta and M the molality. This linear equation holds up to molalities of 6 in pure and mixed salt solutions. The correction is of significance for a variety of geochemical processes, among them the use of the isotope content of different brines as an indicator of the salinization mechanisms of water sources.",

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AU - Sofer, Z.

AU - Gat, J. R.

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Y1 - 1972/1/1

N2 - The conventional procedure for analysis of 18O in aqueous solutions yield δ 18O values on an activity scale rather than a value for the isotope concentration. Conversion between the two scales in natural chloridic solutions containing magnesium, calcium and potassium is given by the equation (δ0 - δm)/(1000 + δm) × 103 = 1.11 MMg + 0.47 MCa - 0.16 MK, where δ0 is the δ value on a concentration scale, δm the measured activity delta and M the molality. This linear equation holds up to molalities of 6 in pure and mixed salt solutions. The correction is of significance for a variety of geochemical processes, among them the use of the isotope content of different brines as an indicator of the salinization mechanisms of water sources.

AB - The conventional procedure for analysis of 18O in aqueous solutions yield δ 18O values on an activity scale rather than a value for the isotope concentration. Conversion between the two scales in natural chloridic solutions containing magnesium, calcium and potassium is given by the equation (δ0 - δm)/(1000 + δm) × 103 = 1.11 MMg + 0.47 MCa - 0.16 MK, where δ0 is the δ value on a concentration scale, δm the measured activity delta and M the molality. This linear equation holds up to molalities of 6 in pure and mixed salt solutions. The correction is of significance for a variety of geochemical processes, among them the use of the isotope content of different brines as an indicator of the salinization mechanisms of water sources.

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Activities and concentrations of oxygen-18 in concentrated aqueous salt solutions: Analytical and geophysical implications

Abstract

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