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Oximetry of oxygen supersaturated solutions using nitroxides as EPR probe
Alberto Moscatelli1, Thomas K Chen, Steffen Jockusch
1Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, USA.
Abstract:
The broadening of the three hyperfine EPR nitroxide lines in oxygen supersaturated solutions was examined. The solutions were supersaturated with oxygen either by thermal decomposition of 1,4-peroxy-1,4-dimethylnaphthalene or by pressurizing molecular oxygen above the sample solution. The linear relationship between the Lorentzian component of the line width and the O(2) concentration was proven to hold even when the hyperfine splitting is unresolved. In this region of line broadening, the requirement for spectral simulation is discussed.
