Registration Dossier
Registration Dossier
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EC number: 244-344-1 | CAS number: 21351-79-1
Toxicity to terrestrial plants
Administrative data
Link to relevant study record(s)
Description of key information
In accordance with column 2 of REACH Regulation (EC) No. 1907/2006, Annex IX and X, section 9.4.3 and 9.4.6, a long- and short-term toxicity to plants test, does not need to be conducted as direct and indirect exposure of the soil compartment is unlikely. Cesium ions have a very low potential to adsorb to soil (silicate minerals only; not displaceable once bound to crystalline structure and therefore not available for plants nutrition) and hydroxide ions may react with free H+ or any acidic species that may be present, forming water. According to the available information, an input via sludge application on agricultural soil is considered to be negligible, as cesium ions do not adsorb to the sewage sludge to a significant extent. Pursuant to its physico-chemical properties, cesium ions from cesium hydroxide and its monohydrate are not expected to be distributed into soil. The estimated log Pow of cesium hydroxide (anhydrous and monohydrate) is expected to be ≤0 due to its salt character and high water solubility. It can be concluded, that the risk for the terrestrial compartment is low and no further information and/or testing is needed.
Key value for chemical safety assessment
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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