The solubility of oxygen in sea water and solutions of electrolytes according to the pulse proton NMR data
- First Online:
- Cite this article as:
- Mel’nichenko, N.A. Russ. J. Phys. Chem. (2008) 82: 1533. doi:10.1134/S0036024408090239
The possibility of determining the content of dissolved oxygen (O2) in distilled water, sea water, and aqueous solutions of electrolytes with errors of ∼2% without preliminary instrument calibration was demonstrated. The reasons for different relaxation efficiency coefficients reported by various authors were analyzed. The results of the determination of the content of O2 from the rate of spin-lattice relaxation in sea water and separate solutions of sea water components at 25°C depending on water salinity (S) up to 180‰ inclusive are presented. Noticeable changes in the steepness of the dependence of the content of O2 on S at 80–90‰ were observed; these changes were related to the attainment of the boundaries of the complete solvation of the main sea water ions. The main reasons for the discrepancies between the oxygen salting out coefficients KS found by various authors were explained, and the interrelation between the solubility of O2 and ion hydration characteristics was revealed. The O2 salting out constants for sea water and solutions of slats contained in sea water obtained from relaxation measurement data are given. The filling of “ice-like formation” voids was shown to be the main mechanism of the solution of O2 in water and aqueous solutions of electrolytes.