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Selenous acid is used in steel guns, wherein it changes the color of the steel from silver-grey to blue-grey. It serves as an important component of the Mecke reagent, which is utilized for drug testing. It acts as a source of selenium. It acts as a reagent for alkaloids and an oxidizing agent. Further, it is used in labeling radiopharmaceuticals. It is involved in the organic synthesis for the preparation of glyoxal.
Kharkongor, I.; Myrboh, B. One-pot synthesis of α-ketoacetals from aryl methyl ketones in the presence of selenous acid catalyzed by boron triflouride etherate. Tetrahedron Lett. 2015, 56 (29), 4359-4362.
Pathe, G. K.; Ahmed, N. SeO2 in water: a mild and efficient promoter for deprotection of acetyl, methoxymethyl and tetrahydropyranyl ethers and sequel oxidation of methyl/methylene carbons of alpha carbonyl carbon. RSC Adv. 2015, 5 (73), 59114-59119.
Hazard Statements: H301+H331-H373
Toxic if swallowed. Toxic if inhaled. May cause damage to organs through prolonged or repeated exposure.
Precautionary Statements: P260-P264b-P270-P271-P301+P310-P304+P340-P311-P314-P330-P501c
Do not breathe dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Do not eat, drink or smoke when using this product. Use only outdoors or in a well-ventilated area. IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Call a POISON CENTER or doctor/physician. Get medical advice/attention if you feel unwell. Rinse mouth. Dispose of contents/ container to an approved waste disposal plant