Subject redox behaviour

It is not only the properties of the compound in question that influence its behaviour but also the environmental and operational conditions it is subjected to (temperature, pressure, pH, redox conditions), as well as the particular configurations of the (biological) reactors (in particular, their partitioning into compartments featuring different conditions mainly aerobic, anoxic and anaerobic), SRT and, to variable extents, HRT. Moreover, in chemical processes, reagent... 

The complexity of the redox processes involving vitamin C have not prevented numerous studies of the oxidation of L-ascorbic acid and some on the oxidation and reduction of dehydroascorbic acid and other oxidation products. One of the reasons for the great interest in this subject is that the role of vitamin C in living systems is certainly connected to its oxidation-reduction behaviour and this may ultimately be the key to understanding the biological mechanisms of the actions of vitamin C. In this. section we will examine the oxidation and reduction of vitamin C by a wide variety of reagents, with emphasis on the behaviour of L-ascorbic acid since this is the most studied compound in this respect. 

The metal foils were used to demonstrate the authenticity of the proposed concept while the oxide powders were used to fabricate the sensor films whose sensing behaviour towards different levels of carbon monoxide or hydrogen in a 10% 02-balance N2 background was monitored before and after these films were subjected to the reduction-oxidation processes described above. A set of these films were also reduced in hydrogen and oxidized in air to differentiate the morphological attributes obtained in the proposed approach versus those resulting from classical redox method. Titania samples were subjected only to reduction in a H2/N2 mixture. 

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