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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Description of key information

The substance is a multi constituent substance containing water. According to REACH Annex XI, study testing of hydrolysis is not feasible for a substance containing water.

Key value for chemical safety assessment

Additional information

Despite of the justification in REACH Annex, environmentally hazardous sulfides are discussed here. In aqueous environments, Na2S and NaHS are immediately hydrolyzed and, as a function of pH, an equilibrium is established between S2-, HS-, and H2S, with increasing H2S formation with decreasing pH. H2S is an extremely toxic gas that can stay present in water for several hours, depending on the oxygen level of the environment under consideration. In oxic systems, oxidation to - eventually - sulfate will occur.