Research Article
Antioxidative Reactivity of L-Ascorbic Acid and D-Isoascorbic Acid Species towards Reduction of Hexachloroiridate (IV)
Figure 5
Determination of the reaction stoichiometries by spectrophotometric titrations for reduction of [IrCl6]2– by AA and IAA. Absorbance at 488 nm versus [AA]tot or [IAA]tot for a series of reaction mixtures in which [Ir(IV)] = 0.40 mM kept constant and [AA]tot or [IAA]tot varied from 0 to 0.50 mM. Reaction medium: [H+] = 0.10 M and 1.0 M ionic strength; reaction time is about 5 min, room temperature.