Estimating the Density and Compressibility of Natural Hypersaline Brines Using the Pitzer Ionic Interaction Model

Jonathan D. Sharp, Muayad H M Albehadili, Frank J Millero, Ryan J. Woosley

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Measurements of density and compressibility of naturally occurring hypersaline brines (Red Sea, Dead Sea, Orca Basin, and Mono Lake) have been analyzed using Pitzer’s ionic interaction model. Pitzer’s volume and compressibility equations for the major components of brines have been used to estimate the densities and compressibilities as a function of temperature and salinity. The estimates at 25 °C were in reasonable agreement with the measured values (0.008 ± 0.127 × 10−3 g cm−3). At higher and lower temperatures (0–40 °C), estimates are less reliable (0.229 ± 0.246 × 10−3 g cm−3). This is largely due to the lack of Pitzer parameters for all the salts at high concentration as a function of temperature. The compressibility estimates at 25 °C are in reasonable agreement with measured values (0.184 ± 0.261 × 10−6 bar−1), but the estimates from 15 to 35 °C are less reliable (0.204 ± 0.726 × 10−6 × bar−1), especially at high salinities. This is largely due to the limited compressibility data as a function of temperature for the major components of brines. These results demonstrate the utility of the Pitzer ionic interaction model to obtain reasonable estimates of density and compressibility of natural brines of known composition.

Original languageEnglish (US)
Pages (from-to)11-29
Number of pages19
JournalAquatic Geochemistry
Volume21
Issue number1
DOIs
StatePublished - 2015

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brines
Brines
compressibility
Compressibility
Density (specific gravity)
estimating
estimates
interactions
salinity
Red Sea
Temperature
temperature
lakes
Catchments
Lakes
Salts
salts
salt
lake
Chemical analysis

Keywords

  • Compressibility
  • Density
  • Molal adiabatic compressibility
  • Molal volume
  • Natural brines
  • Pitzer equations

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Estimating the Density and Compressibility of Natural Hypersaline Brines Using the Pitzer Ionic Interaction Model. / Sharp, Jonathan D.; Albehadili, Muayad H M; Millero, Frank J; Woosley, Ryan J.

In: Aquatic Geochemistry, Vol. 21, No. 1, 2015, p. 11-29.

Research output: Contribution to journalArticle

Sharp, Jonathan D. ; Albehadili, Muayad H M ; Millero, Frank J ; Woosley, Ryan J. / Estimating the Density and Compressibility of Natural Hypersaline Brines Using the Pitzer Ionic Interaction Model. In: Aquatic Geochemistry. 2015 ; Vol. 21, No. 1. pp. 11-29.
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