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

Z. Sofer, J. R. Gat

Research output: Contribution to journalArticlepeer-review

199 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 - 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.

Original languageEnglish
Pages (from-to)232-238
Number of pages7
JournalEarth and Planetary Science Letters
Volume15
Issue number3
DOIs
StatePublished - 1 Jan 1972
Externally publishedYes

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