A spin-trapping technique for distinguishing between free and "bound hydroxyl" radicals has been proposed in the literature. This technique relied upon observations of the steady-state concentrations of the spin-adducts of•OH and [Formula: see text] (from formate) to 5,5-dimethyl-1-pyrroline-N-oxide. In the present work, it is shown that the steady-state approach was only qualitatively correct. An alternative procedure is demonstrated which involves monitoring the growth of the spin-adducts after the start of radical generation. The latter approach is found to be quantitative.
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Castelhano et al. (1983) studied this question.