Oxidation hydrogen sulfide

Manganese dioxide Aluminum, hydrogen sulfide, oxidants, potassium azide, hydrogen peroxide, peroxosulfuric acid, sodium peroxide... 

Like ammonia, hydrogen sulfide (oxid. no. S = —2) can act only as a reducing agent when it takes part in redox reactions. Most often the H2S is oxidized to elementary sulfur, as in the reaction... 

See Hydrazine and derivatives, above Hydrogen sulfide Oxidants Non-metal hydrides, above Potassium phosphinate Air, or Nitric acid Sulfur dioxide, below... 

Hydrogen peroxide Metals, Metal oxides, Metal salts Hydrogen sulfide Oxidants... 

Elemental sulfur and thiosulfate are rarely measured due to difficulties of the analytical technique [42], Such measurements completed in summer 1989, winter 1991 [43], and summer 2004 testify that these parameters are being formed as intermediate products or from hydrogen sulfide oxidation. Their concentrations in the upper part of the anoxic layer were about 1-7 p,M. Directly at the density of hydrogen sulfide onset, elemental sulfur is the dominant form of these three species (about 50-80% of total reduced sulfur) [43]. A step of sharp decrease in concentrations of elemental sulfur and thiosulfate to about 0.5-1 jlM is usually observed about 3-5 m higher than the hydrogen sulfide onset. Volkov et al. [43] noted that the distributions of reduced sulfur forms were more pronounced in summer than in winter. 

The formation of sulfur intermediates is both chemically and biologically mediated. Oxidation of hydrogen sulfide with oxygen and Fe(Mn) oxyhy-droxides and sulfate reduction are the main processes responsible for sulfur intermediates formation in the euxinic water columns, except for elemental sulfur, which is formed only during hydrogen sulfide oxidation. Chemically mediated reactions of thiosulfate formation are elemental sulfur(polysulfides)... 

Vairavamurthy A. and Anonymous (1993) Geochemical incorporation of sulfur into organic matter importance of hydrogen sulfide oxidation product. Abstracts with Programs—Geological Society of America, Geological Society of America (GSA), vol. 25, pp. 19. 

Table 9.7. I Homogeneous, surface and enzyme catalysis of carbon dioxide hydration, hydrogen sulfide oxidation and Mn oxidation... 

Ghosh, T.K. and ToUefson, E.L. (1986). Kinetics and reaction mechanism of hydrogen sulfide oxidation over activated carbon in the temperature range of 125-200°C. Can.]. Chem. Eng., 64, 969-76. 

Steijns, M., Derks, F., Verloop, A., and Mars, P. (1976). The mechanism of the catalytic oxidation of hydrogen sulfide. II Kinetics and mechanism of hydrogen sulfide oxidation catalyzed by sulfur./. Catal., 42, 87—95. 

HYDROGEN SULFIDE OXIDATION BY THESE STRONG OXIDANTS... 

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