Abstract
The thermodynamic stability constants for the hydrolysis and formation of mercury (Hg2+) chloride complexes Hg2+ + nH2O = Hg(OH)n (2-n)+ + nH+ βn Hg2+ + nCl- = HgCln (2-n)+ βi have been used to calculate the activity coefficients for Hg(OH)n (2-n)+ and HgCln (2-n)+ complexes using the Pitzer specific interaction model. These values have been used to determine the Pitzer parameters for the hydroxide and chloro complexes βML (0), βML (1) and CML). The values of λij and ζijk have been determined for the neutral complexes (Hg(OH)2 and HgCl2). The resultant parameters yield calculated values for the measured values of log β* to ±0.01 from I = 0.1 to 3 m at 25°C. Since the activity coefficients of Hg(OH)n (2-n)+ and HgCln (2-n)+ are in reasonable agreement with the values for Pb(II), we have estimated the effect of temperature on the chloride constants for Hg(II) from 0 to 300°C and I = 0-6 m using the Pitzer parameters for PbCln (2-n)+ complexes. The resulting parameters can be used to examine the speciation of Hg(II) with Cl- in natural waters over a wide range of conditions.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 339-355 |
| Number of pages | 17 |
| Journal | Aquatic Geochemistry |
| Volume | 13 |
| Issue number | 4 |
| DOIs | |
| State | Published - Dec 2007 |
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Keywords
- Activity coefficients
- Chloride complexes
- Mercury(II) hydroxide
- NaClO
- Pitzer equations
- Speciation
ASJC Scopus subject areas
- Geochemistry and Petrology
- Geophysics
Cite this
Use of Pitzer equations to examine the formation of mercury(II) hydroxide and chloride complexes in NaClO4 media. / González-Dávila, Melchor; Santana-Casiano, J. Magdalena; Millero, Frank J.
In: Aquatic Geochemistry, Vol. 13, No. 4, 12.2007, p. 339-355.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Use of Pitzer equations to examine the formation of mercury(II) hydroxide and chloride complexes in NaClO4 media
AU - González-Dávila, Melchor
AU - Santana-Casiano, J. Magdalena
AU - Millero, Frank J
PY - 2007/12
Y1 - 2007/12
N2 - The thermodynamic stability constants for the hydrolysis and formation of mercury (Hg2+) chloride complexes Hg2+ + nH2O = Hg(OH)n (2-n)+ + nH+ βn Hg2+ + nCl- = HgCln (2-n)+ βi have been used to calculate the activity coefficients for Hg(OH)n (2-n)+ and HgCln (2-n)+ complexes using the Pitzer specific interaction model. These values have been used to determine the Pitzer parameters for the hydroxide and chloro complexes βML (0), βML (1) and CML). The values of λij and ζijk have been determined for the neutral complexes (Hg(OH)2 and HgCl2). The resultant parameters yield calculated values for the measured values of log β* to ±0.01 from I = 0.1 to 3 m at 25°C. Since the activity coefficients of Hg(OH)n (2-n)+ and HgCln (2-n)+ are in reasonable agreement with the values for Pb(II), we have estimated the effect of temperature on the chloride constants for Hg(II) from 0 to 300°C and I = 0-6 m using the Pitzer parameters for PbCln (2-n)+ complexes. The resulting parameters can be used to examine the speciation of Hg(II) with Cl- in natural waters over a wide range of conditions.
AB - The thermodynamic stability constants for the hydrolysis and formation of mercury (Hg2+) chloride complexes Hg2+ + nH2O = Hg(OH)n (2-n)+ + nH+ βn Hg2+ + nCl- = HgCln (2-n)+ βi have been used to calculate the activity coefficients for Hg(OH)n (2-n)+ and HgCln (2-n)+ complexes using the Pitzer specific interaction model. These values have been used to determine the Pitzer parameters for the hydroxide and chloro complexes βML (0), βML (1) and CML). The values of λij and ζijk have been determined for the neutral complexes (Hg(OH)2 and HgCl2). The resultant parameters yield calculated values for the measured values of log β* to ±0.01 from I = 0.1 to 3 m at 25°C. Since the activity coefficients of Hg(OH)n (2-n)+ and HgCln (2-n)+ are in reasonable agreement with the values for Pb(II), we have estimated the effect of temperature on the chloride constants for Hg(II) from 0 to 300°C and I = 0-6 m using the Pitzer parameters for PbCln (2-n)+ complexes. The resulting parameters can be used to examine the speciation of Hg(II) with Cl- in natural waters over a wide range of conditions.
KW - Activity coefficients
KW - Chloride complexes
KW - Mercury(II) hydroxide
KW - NaClO
KW - Pitzer equations
KW - Speciation
UR - http://www.scopus.com/inward/record.url?scp=36749089016&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=36749089016&partnerID=8YFLogxK
U2 - 10.1007/s10498-007-9023-y
DO - 10.1007/s10498-007-9023-y
M3 - Article
AN - SCOPUS:36749089016
VL - 13
SP - 339
EP - 355
JO - Aquatic Geochemistry
JF - Aquatic Geochemistry
SN - 1380-6165
IS - 4
ER -