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

Frank J. Millero

doi:10.1016/0016-7037(77)90228-9

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

Frank J. Millero

Ocean Sciences

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

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) = V⁰(MX) + S_vI^{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)
Pages (from-to)	215-223
Number of pages	9
Journal	Geochimica et Cosmochimica Acta
Volume	41
Issue number	2
DOIs	https://doi.org/10.1016/0016-7037(77)90228-9
State	Published - Feb 1977

ASJC Scopus subject areas

Geochemistry and Petrology

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title = "The use of the specific interaction model to estimate the partial molal volumes of electrolytes in seawater",

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) = V0(MX) + SvI 1 2 (1 + I 1 2) + vM ∑ XBMX[X] + vX ∑ MBMX[X], where SV is the Debye-H{\"u}ckel 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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AU - Millero, Frank J.

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

Abstract

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