Registration Dossier
Registration Dossier
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EC number: 215-127-9 | CAS number: 1304-28-5
Endpoint summary
Administrative data
Description of key information
Additional information
Barium oxide reacts violently with water to form barium hydroxide according to the chemical equation:
BaO + H2O ----> Ba(OH)2
The hydrolysis of barium oxid is rapid, complete and very exothermic. Barium hydroxide has a water solubility of 49.1 g/L at 25 °C (CRC Handbook of Chemistry and Physics, 88th ed. Boca Raton, FL: CRC Press Inc., 2008) and dissociates in water to form barium and hydroxide ions.
Barium chloride (CAS No. 10361-37-2) has a water solubility of 263/g/L (Kirk-Othmer Encyclopedia of Chemical Technology, 4th ed. Volumes 1: New York, NY. John Wiley and Sons, 1991-Present) and dissociates in water to barium and chloride ions.
The read-across from barium chloride to barium oxide /barium hydroxide is justified on the following basis: both substances are very soluble in water hence bioavailable and both will release Ba 2+ ions.
Therefore, from an ecotoxicity standpoint, the chloride or hydroxide anions are not considered to have any influence on the effective toxicity of Ba2+or any toxicity in their own right, so the anions can be disregarded. Therefore any effect will be related to the Ba2+cation, and the data from ecotoxicity tests conducted with barium chloride and other soluble barium salts are regarded as a suitable surrogate for read-across.
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