Prediction of oxygen solubility in pure water and brines up to high temperatures and pressures

Ming Geng, Zhenhao Duan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)

Abstract

A thermodynamic model is presented to calculate the oxygen solubility in pure water (273-600K, 0-200bar) and natural brines containing Na+, K+, Ca2+, Mg2+, Cl-, SO42-, over a wide range of temperature, pressure and ionic strength with or close to experimental accuracy. This model is based on an accurate equation of state to calculate vapor phase chemical potential and a specific particle interaction model for liquid phase chemical potential. With this approach, the model can not only reproduce the existing experimental data, but also extrapolate beyond the data range from simple aqueous salt system to complicated brine systems including seawater. Compared with previous models, this model covers much wider temperature and pressure space in variable composition brine systems. A program for this model can be downloaded from the website: http://www.geochem-model.org.

Original languageEnglish
Pages (from-to)5631-5640
Number of pages10
JournalGeochimica et Cosmochimica Acta
Volume74
Issue number19
DOIs
Publication statusPublished - Oct 2010

Bibliographical note

Funding Information:
This research is supported by the National Science Foundation of China (Grants #90914010 and #40873050 ) and “Major development Funds” (#:kzcx2-yw-124) by Chinese Academy of Sciences. Thanks to the three anonymous reviewers and Dr. Jacques Schott for their constructive suggestions for improving the paper.

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