| http://www.w3.org/ns/prov#value | - In some cases, the analyte D and the second compound, in this case, a reactant compound E, such as oxygen, react in the presence of the catalyst, as shown in reaction equation (3). ##STR2## The reactant compound E is then directly oxidized (or reduced) at the working electrode, as shown in reaction equation (4) ##STR3## Alternatively, the reactant compound E is indirectly oxidized (or reduced) usi
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