A new method for the determination of oxygen solubilities by EPR
- Cite this article as:
- Cipollone, M., di Palma, C. & Pedulli, G.F. Appl. Magn. Reson. (1992) 3: 99. doi:10.1007/BF03166783
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Free radicals dissolved in oxygen-containing solutions give rise to EPR spectra characterized by very broad lines due to Heisenberg spin exchange. In the method herein proposed oxygen is consumed at a constant rate, within the cavity of an EPR spectrometer, by alkyl radicals generatedin situ by thermal decomposition of an aliphatic azo compound in the presence of a nitroxide probe. The effect of decreasing the oxygen concentration is to reduce the width, and therefore to increase the height of the spectral lines of the nitroxide, which reach a maximum when oxygen has been completely consumed. From the knowledge of the rate of generation of the alkyl radicals, the oxygen solubility in a given solvent can be easily determined.