Linking Transition Metal Concentration and Oxidative Potential in PM<sub>2.5</sub> by Ascorbic Acid Assay via Quasi-Michaelis-Menten Mechanism.

If AA oxidation followed first-order reaction kinetics with respect to AA (i.e., rate = k [AA]), normalization would yield a flat trend in Figure b, as the dependency on AA concentration would be eliminated. However, high Cu samples showed a decreasing trend, indicating that the reaction does not follow first-order reaction kinetics.

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