Assessing Redox Properties of Natural Organic Matters with regard to Electron Exchange Capacity and Redox-Active Functional Groups

Figure 3

The reducing capacity of different molecular weight fractions of PPNOM in their native and reduced states. Each reduced sample was prepared by H₂ in the presence of two Pd catalysts. The reducing capacities were determined by the difference of Fe[III] before and after reacting with ferricyanide. Each data were normalized into meq e⁻/g C, which is equal to mmol e⁻/g C in numerical value.