Selenium dioxide

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Yellowish-white, shiny crystals that reacts with moisture to produce a pungent smelling greenish vapor. Selenium dioxide is used in photographic toning baths and in the manufacture of red and pink glass and glazes.

Synonyms and Related Terms

selenium oxide; selenium (IV) oxide; selenous acid anhydride; selenious anhydride

Chemical structure

Selenium dioxide.jpg

Other Properties

Soluble in ethanol, water; sulfuric acid. Crystals are four-sided needles.

Composition SeO2
CAS 7446-08-4
Melting Point 340-350 (sublimes)
Density 3.954
Molecular Weight mol. wt. = 110.9
Refractive Index >1.76

Hazards and Safety

Toxic by ingestion, inhalation and contact. Corrosive in the presence of moisture.

LINK: International Chemical Safety Card

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 696
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 8576
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index= >1.76

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