Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Sulphur trioxide reacts rapidly with water and even trace levels of atmospheric moisture to form sulphuric acid, a strong mineral acid that completely dissociates readily in water to hydrogen ions and sulphate ions (at environmentally relevant pH) and is totally miscible with water. The hydrogen ions, although not degraded as such due to their elemental nature, contribute to the pH of the local environment and are potentially mobile. The sulphate ions are incorporated into the various mineral species present in the environment. No further information is necessary.

No data on terrestrial toxicity are available and no testing is proposed. Waivers are proposed for all endpoints based on the lack of exposure, however endpoints may have to be re-considered in light of more detailed exposure modelling for all uses in the CSR.

Additional information