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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways


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Administrative data

Link to relevant study record(s)

Data waiving:
study technically not feasible
Justification for data waiving:

Description of key information

Hydrolysis is not possible as potassium thiosulfate dissociates rapidly into thiosulfate anions and potassium cations and is transformed e.g. by oxidation, reduction, speciation, precipitation in environmental solutions. Accordingly, data available on an analogue substance (disodium thiosulfate , CAS 7772-98-7) according to a OECD 111 (Hydrolysis as a function of pH) conform study show no indication of hydrolysis for the test substance in aqueous media.

Key value for chemical safety assessment

Additional information