Sulphite, oxidation

Sodium arsenite does not oxidize in air while sodium sulphite oxidizes. When mixture of sodium arsenite and sodium sulphite is treated, both of them undergo simultaneous oxidation. Oxidation of sodium sulphite catalyses the oxidation of sodium arsenite. 

Note Bubble column mass transfer parameters are difficult to estimate reliably. 9 The above figures are based on results from the sulphite oxidation method at a higher electrolyte concentration than the 0.05M solution to be used in the present example, and therefore the values for and a may be overestimates. 

In section6.3.1, it was shown that for the second oxidation wave of sodium dithionite (sulphite oxidation to sulphate), an influence of electron-transfer rate (kinetics) is observed that cannot be neglected. Therefore, first the oxidation of sulphite is studied and described, followed by the oxidation reaction of sodium dithionite. 

These slow kinetics can be explained by the following hypothesis. In the first scan, it is presumed that the relative amount of PtO sites present (necessary for sulphite oxidation) is small compared with the Pt and PtOH sites (not favourable for sulphite oxidation) owing to the pre-treatment of the... 

Of the various methods used to determine k a, the chemical method, based initially on the sulphite oxidation (Cooper et al., 11) and later extended to other reactions (Sharma and Danckwerts, 12), has been widely used. 

Physical (including thermochemical and explosive) properties Chemical properties of 2,4,6-trinitrotoluene Reaction with sodium sulphite Oxidation of 2,4,6-trinitrotoluene Reduction of 2,4,6-trinitrotoluene Melhylation of 2,4,6-trinitrotoluene... 

Mori T, Nonaka T, Tazaki K, Koga M, Hikosaka Y, Noda S (1992) Interactions of nutrients, moisture and pH on microbial corrosion on concrete sewer pipes. Wat Res 26 29-37 Moriarty DJW, Nicholas DJD (1970) Electron transfer during sulphide and sulphite oxidation by Thiobacillus concretivorus. Biochim Biophys Acta 216 130-138 Morikawa M, Imanaka T (1993) Isolation of a new mixotrophic bacterium which can fix C02 and assimilate aliphatic and aromatic hydrocarbons anaerobically. J Ferment Bioeng 76 280-283... 

Linek, V. and J. Tvrdik, "A Generalization of Kinetic Data on Sulphite Oxidation Systems", Biotechnology and Bioengineering, 1971, Volume XIII, 353-369. 

This expression is found useful for determining interfacial area in bubble column reactors (sulphite oxidation). Thus, by measuring transfer rate (moles/sec) for known values of C, kj, and D, then area A can be calculated. The method is not restricted to linear kinetics, in light of Eq. 2.120. 

Fig, 28. Comparison of gas/liquid interfacial area as a function of the energy dissipation rate (necessary power input) in sulphite oxidation systems, [ 1, stirred tank reactor S lReith(118)] 2,bubble column-porous plate G [authors] 3, bubble column-perforated plate S[Reith(118)J 4, ejector nozzle S [Nagel(il8)] 5, nacked bubble column S lNagel(117)) 6, bubble column-injector nozzle G authorsJ. G geometrical area ... 

In the special case of Co sulphite oxidation, the reaction rate is directly dependent on the Co concentration, and consequently Ha = /(Co ). 

Molybdenmn Xanthine dehydrogenase Sulphite oxidase Purine metabolism Sulphite oxidation... 

SO2 removal from exhaust gas, the caustic scmbber and sulphite oxidation... 

The major portion of the interest in crown ethers now seems to reside in (i) the novelty of the grouping(s) built into the rings this year s crop includes xanthates, sulphites, oxidized and reduced pyridines, bipyridyl, and ferrocene and/or (ii) the uses to which the chelating species are put. Thus, Lehn and Vierling have designed a crown ether (443) with an overwhelming... 

---