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Breaking cover: Hydroxyl radicals OH. destroy the self-assembled monolayer (SAM) of hexanethiol on gold and mercury electrodes and thus allow the electrochemical response of the redox couple Ru2+/3+ to be measured. On a completely SAM-covered electrode the Ru2+/3+ signal is absent, thus the recovery of the signal following radical attack is a reliable measure of the radical activity.
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Scholz et al. (2007) studied this question.
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