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Environmental fate & pathways


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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.