Registration Dossier
Registration Dossier
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EC number: 232-156-2 | CAS number: 7789-29-9
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Classification for Persistence
Potassium 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 K+, H+ and F- ions which are naturally ubiquitous in the terrestrial and aquatic compartments of the environment. As such potassium hydrogenfluoride does not satisfy the criteria for classification as persistent.
Classification for Bioaccumulation
No data is available for bioaccumulation of potassium hydrogendifluoride. However, the substance is considered to have a low potential for crossing biological membranes and dissociates fully to its constituent ions (K+, H+ and F-) in aqueous environments. Data available for potassium 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 potassium hydrogendifluoride is not considered to satisfy the criteria for classification as bioaccumulative.
Classification for Toxicity
The toxic effects of potassium 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 classifacation for acute or chronic toxcity 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.
- Likely routes of exposure:
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 potassium hydrogendifluoride. Exposure to all other compartments is considered.
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