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 language | English (US) |
|---|---|
| Pages (from-to) | 11-29 |
| Number of pages | 19 |
| Journal | Aquatic Geochemistry |
| Volume | 21 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2015 |
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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 journal › Article
}
TY - JOUR
T1 - Estimating the Density and Compressibility of Natural Hypersaline Brines Using the Pitzer Ionic Interaction Model
AU - Sharp, Jonathan D.
AU - Albehadili, Muayad H M
AU - Millero, Frank J
AU - Woosley, Ryan J.
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
KW - Compressibility
KW - Density
KW - Molal adiabatic compressibility
KW - Molal volume
KW - Natural brines
KW - Pitzer equations
UR - http://www.scopus.com/inward/record.url?scp=84925517818&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84925517818&partnerID=8YFLogxK
U2 - 10.1007/s10498-015-9252-4
DO - 10.1007/s10498-015-9252-4
M3 - Article
AN - SCOPUS:84925517818
VL - 21
SP - 11
EP - 29
JO - Aquatic Geochemistry
JF - Aquatic Geochemistry
SN - 1380-6165
IS - 1
ER -