A review of the current understanding of redox capacity in natural, disequilibrium systems

Abstract This paper reviews the conceptual significance of the redox capacity in natural systems that are typically in a state of redox disequilibria. Redox capacity has been shown to be thermodynamically undefinable in disequilibrium systems. Comparisons are made between poising capacity and the acid base analog, buffer capacity. Alternate methods of assessing redox capacity that do not necessitate solution equilibrium are discussed.

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