Occasions and Possible Mechanisms of Mutual Acceleration and Inhibition of Joint Oxidation Reactions of Sulfide Anion and Cysteine

The model system simulating oxidation of sulfuric-alkaline drains is investigated. The mutual influence of processes of joint oxidation of sulfide-anion and cysteine, revealed strong alkaline environments both at the presence, and in the absence of the catalyst, causes occurrent synergism (non-additivity effects) in the system. The reasons of occurrence of non-additivity effects can be due to a consecutive course of sulfide-anion and cysteine oxidation in a mix and the modification of the catalyst which is shown to have a negative effect. The positive effect is caused by the influence of cystine (a product of cysteine oxidation) on the sodium sulfide oxidation.