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EC number: 215-608-3
CAS number: 1333-83-1
Classification for Persistence
Sodium hydrogendifluoride is an inorganic substance and so the issue of
biodegradation does not apply. The substance dissociates rapidly to its
constituent ions in the aqueous environment, forming Na+, H+ and F- ions
which are naturally ubiquitous in the terrestrial and aquatic
compartments of the environment. As such sodium hydrogenfluoride does
not satisfy the criteria for classification as persistent.
Classification for Bioaccumulation
No data is available for bioaccumulation of sodium hydrogendifluoride.
However, the substance is considered to have a low potential for
crossing biological membranes and dissociates fully to its constituent
ions (Na+, H+ and F-) in aqueous environments. Data available for sodium
and fluoride indicates that bioaccumulation will not occur and as the
behaviour of these species is well characterised, no further information
is required. As such sodium hydrogendifluoride is not considered to
satisfy the criteria for classification as bioaccumulative.
Classification for Toxicity
The toxic effects of sodium hydrogendifluoride are considered to be
primarily due to fluoride ions from dissociation of the substance. Tests
carried out with an appropriate read-across substance found that no
classification for acute or chronic toxicity is triggered based on the
criteria set out in EU regulation 1272/2008 (CLP) or under Annex XII of
REACH. As such, the substance is not considered toxic.
No significant exposure is expected in the air compartment or through
secondary poisoning. Background levels of fluoride in the marine
compartment are expected to be greater than those arising from sodium
hydrogendifluoride. Exposure to all other compartments is considered.
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.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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