## Abstract

The solubility of oxygen has been measured in a number of electrolytes [(LiCl, KCl, RbCl, CsCl, NaF, NaBr, NaI, NaNO_{3}, KBr, KI, KNO _{3}, CaCl_{2}, SrCl_{2}, BaCl_{2}, Li _{2}SO_{4}, K_{2}SO_{4}, Mn(NO_{3}) _{3})] as a function of concentration at 25°C. The solubilities, μmol (kg-H_{2}O)^{-1}, have been fitted to a function of the molality m (standard deviation σ < 3μmol-kg^{-1}) ln([O _{2}]^{0}/[O_{2}]) = lnγ(O_{2}) = Am + Bm^{2} where A and B are adjustable parameters and the activity coefficient of oxygen γ (O_{2}) = [O_{2}] ^{0}/[O_{2}]. The limiting salting coefficient, k_{S} = (∂lnγ/∂m)_{m=0} = A, was determined for all salts. The salting coefficients for the chlorides and sodium salts showed a near linear correlation with the crystal molar volume V_{cryst} = 2.52 r ^{3}. The salting coefficients determined from the Scaled Particle Theory were in reasonable agreement with the measured values. The activity coefficients of oxygen in the solutions have been interpreted using the Pitzer equation (Equation Presented) where λ_{O2i} is a parameter that accounts for the interaction of O_{2} with cations (c) and anions (a) with molalities m_{a} and m_{c}, and ζ_{O2ca} accounts for interactions for O_{2} with the cation and anion pair (c-a). The ζ_{O2i} and ζ_{O2ca} coefficients determined for the most of the ions are in reasonable agreement with the tabulations of Clegg and Brimblecombe. The values λ_{O2i} for most of the ions are a linear function of the electrostriction molar volume (V_{elect} = V^{0} - V_{cryst}).

Original language | English (US) |
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Pages (from-to) | 473-487 |

Number of pages | 15 |

Journal | Journal of Solution Chemistry |

Volume | 32 |

Issue number | 6 |

DOIs | |

State | Published - Jun 2003 |

## Keywords

- Activity coefficient
- Alkali and alkaline earth chlorides
- Oxygen
- Salts
- Solubility

## ASJC Scopus subject areas

- Biophysics
- Biochemistry
- Molecular Biology
- Physical and Theoretical Chemistry