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Hazard Predictions

• Flammable: Reaction products may be flammable
• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive
• Toxic: Reaction products may be toxic

H2S may react explosively with BrF5 (Mellor, J.W. 1956. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 2, Supp. 1, p. 172. Longmans, Green and Co Ltd.), ClF3 (Mellor. 1956. Volume 2, Supplemental 1. pp. 157.), Cl2O (Mellor. 1941. Volume 2. pp. 241-242; 1946. Volume 5. pp. 824.), or F2O (Streng, A.G. 1963. Chemical Reviews 63:612.).

H2S ignites on contact with silver bromate, mercury(I) bromate, lead(II) hypochlorite (Pascal, P. 1960. Nouveau Trait茅 de Chimie Min茅rale. Vol. 13.1, p. 1004. Masson et Cie.), heptasilver nitrate octaoxide (Mellor, J.W. 1941. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 3, p. 483-485. Longmans, Green and Co Ltd.), dibismuth dichromium nonaoxide (Pascal, 1960. Volume 13.1. pp. 1025.), Na2O2 (Barrs, C.E. 1955. Journal of the Royal Institute of Chemistry 79:43), and other peroxides (Mellor. 1947. Volume 10. pp. 129.).

Many inorganic sulfides ignite on contact with fluorine (Mellor, J.W. 1940. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 2, pp. 11, 13. Longmans, Green and Co Ltd.; Volume 6, pp. 110; 1938, Volume 9. pp. 522; 1947. Volume 10. pp. 133; 1943. Volume 11. pp. 430; Moissan, H., Le Fluor et ses Composes, Paris, Steinheil, 1900, pp. 231-232.) or chlorine (Mellor. 1940. Volume 4. pp. 952; 1946. Volume 6. pp. 144; 1939. Volume 9. pp. 270.).

H2S reacts exothermically, possibly igniting due to reaction heat, with many metal oxides, including BaO2, CrO3, CuO, PbO2, MnO2, NiO, Ag2O, AgO, Na2O2, and Tl2O3. 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.).

Sulfides can form flammable or explosive mixtures with NaClO3 (MCA Safety Datasheet 42, Manufacturing Chemists' Association, Washington, 1952).

PbS reacts violently with H202 (Lewis, R.J., Sr. 1992. Sax's Dangerous Properties of Industrial Materials, 8th Edition. New York: Van Nostrand Reinhold. pp. 2105).

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

• Hydrogen Sulfide (H2S)
• Sulfur Oxides (SOx)