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Hazard Predictions

• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)

H2S reacts exothermically with many metal oxides, including BaO2, CrO3, CuO, PbO2, MnO2, NiO, Ag2O, AgO, Na2O2, and Tl2O3. The hydrogen sulfide may ignite due to heat produced during the reaction. Mixtures with group II oxides and either HgO or NiO are particularly dangerous, possibly reacting explosively (Mellor, J.W. 1947. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 10, pp. 129, 141. Longmans, Green and Co Ltd.).

Inorganic sulfides may liberate toxic SOx gases upon oxidation by inorganic oxidizing agents (Predicted).

Hydrogen sulfide is rapidly oxidized and may ignite in the presence of several metal oxides, including copper oxide, lead dioxide, and silver oxide. (Urben, P.G. 1995. Bretherick's Handbook of Reactive Chemical Hazards, 5th Edition. Oxford: Butterworth-Heinemann. Vol. 1, pp. 1547).

Hydrogen trisulfide (HSSSH) decomposes violently and ignites upon contact with copper oxide, lead (II) oxide, lead (IV) oxide, mercury (II) oxide, tin (IV) oxide, or iron (II, III) oxide. (J. W. Mellor, 1947. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 10, pp. 159. Longmans, Green and Co Ltd.).

Potential Gas Byproducts

• Sulfur Oxides (SOx)