### Abstract

The specific interaction model has been used to determine the partial molal volume of electrolytes in 0.725 m NaCl and 35‰ salinity seawater solutions at 25°C. The partial molal volumes of electrolytes (MX) were estimated at a given ionic strength (I) from V(MX) = V^{0}(MX) + S_{v}I^{ 1 2} (1 + I^{ 1 2}) + v_{M} ∑ XB_{MX}[X] + v_{X} ∑ MB_{MX}[X], where S_{V} is the Debye-Hückel limiting law slope, v_{i} is the number of ions i formed when MX dissociated, [i] is the total molality of ion i and B_{MX} is a specific interaction parameter that varies slowly with ionic strength. The values of V(MX) estimated by using this equation were found to agree very well with experimental values in NaCl and seawater providing there are not strong interactions between M and X. For electrolytes that form ion pairs (i.e. MX°) corrections must be made. Methods are discussed for making these corrections.

Original language | English (US) |
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Pages (from-to) | 215-223 |

Number of pages | 9 |

Journal | Geochimica et Cosmochimica Acta |

Volume | 41 |

Issue number | 2 |

DOIs | |

State | Published - 1977 |

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### ASJC Scopus subject areas

- Geochemistry and Petrology

### Cite this

**The use of the specific interaction model to estimate the partial molal volumes of electrolytes in seawater.** / Millero, Frank J.

Research output: Contribution to journal › Article

*Geochimica et Cosmochimica Acta*, vol. 41, no. 2, pp. 215-223. https://doi.org/10.1016/0016-7037(77)90228-9

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TY - JOUR

T1 - The use of the specific interaction model to estimate the partial molal volumes of electrolytes in seawater

AU - Millero, Frank J

PY - 1977

Y1 - 1977

N2 - The specific interaction model has been used to determine the partial molal volume of electrolytes in 0.725 m NaCl and 35‰ salinity seawater solutions at 25°C. The partial molal volumes of electrolytes (MX) were estimated at a given ionic strength (I) from V(MX) = V0(MX) + SvI 1 2 (1 + I 1 2) + vM ∑ XBMX[X] + vX ∑ MBMX[X], where SV is the Debye-Hückel limiting law slope, vi is the number of ions i formed when MX dissociated, [i] is the total molality of ion i and BMX is a specific interaction parameter that varies slowly with ionic strength. The values of V(MX) estimated by using this equation were found to agree very well with experimental values in NaCl and seawater providing there are not strong interactions between M and X. For electrolytes that form ion pairs (i.e. MX°) corrections must be made. Methods are discussed for making these corrections.

AB - The specific interaction model has been used to determine the partial molal volume of electrolytes in 0.725 m NaCl and 35‰ salinity seawater solutions at 25°C. The partial molal volumes of electrolytes (MX) were estimated at a given ionic strength (I) from V(MX) = V0(MX) + SvI 1 2 (1 + I 1 2) + vM ∑ XBMX[X] + vX ∑ MBMX[X], where SV is the Debye-Hückel limiting law slope, vi is the number of ions i formed when MX dissociated, [i] is the total molality of ion i and BMX is a specific interaction parameter that varies slowly with ionic strength. The values of V(MX) estimated by using this equation were found to agree very well with experimental values in NaCl and seawater providing there are not strong interactions between M and X. For electrolytes that form ion pairs (i.e. MX°) corrections must be made. Methods are discussed for making these corrections.

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U2 - 10.1016/0016-7037(77)90228-9

DO - 10.1016/0016-7037(77)90228-9

M3 - Article

VL - 41

SP - 215

EP - 223

JO - Geochmica et Cosmochimica Acta

JF - Geochmica et Cosmochimica Acta

SN - 0016-7037

IS - 2

ER -