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- W2024480566 abstract "The participation of a form of molybdenum in the active sites of some enzymes such as nitrate reductase is a consequence of the efficiency of the metallic ion in a low oxidation state in taking part in chemical reactions as aceptor/donor of oxo-groups [l]. In electrochemical studies involving the MoWI) species in acidic medium, a molybdenum intermediate is generated, which probably has similar physicochemical properties to the metallic ion in the nitrato reductase molybdoenzyme, since a catalytic wave appears in the presence of nitrate [2]. The increase in polarographic currents during catalytic processes has been used to determine both the metal ion and the substrate. The sequence of reactions in a typical catalytic cycle involves reduction of the metallic ion at the electrode and further chemical oxidation of the reduced species by an appropriate electrochemically inactive substrate. The higher the rate constant of the chemical reaction, the higher is the ratio between the polarographic currents in the presence and in the absence of the reactant. In fact, in electrochemical processes molybdenum shows catalytic behavior when oxidant ions as nitrate 121, perchlorate [3] or chlorate [4] are present in the solution. The magnitude of the catalytic current in the system depends on factors such as the acidity, the molybdenum and substrate concentrations and the existence of ligands that could stabilize the catalytically active molybdenum species. The present study was performed in order to characterize the existence of a catalytic cycle in the MoWI)/H,SO, system in the presence of hydrazoic acid, I-IN,. This acid shows some peculiar chemical properties. It has a pK, value similar to acetic acid [5]," @default.
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- W2024480566 date "1994-10-01" @default.
- W2024480566 modified "2023-09-27" @default.
- W2024480566 title "Studies on the molybdenum/ hydrazoic acid catalytic polarographic system in sulfuric medium" @default.
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- W2024480566 doi "https://doi.org/10.1016/0022-0728(94)03440-0" @default.
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