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Long-term toxicity to fish

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Description of key information

Based on the low toxicity in acute studies with fish, physical-chemical properties and hydrolysis behaviour of disodium persulfate, long term toxicity testing of fish was considered not scientifically justified.

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In accordance to Column 2 REACH Annex IX, long-term toxicity to fish, information requirement 9.1.6, can be waived if no toxicity to aquatic organisms is expected. The short-term toxicity testing to fish revealed that persulfates are practically non-toxic to fish. Upon contact with water or water vapour substances of the Persulfate Category hydrolyse into cation and persulfate anion. Hydrolysis is temperature and pH dependent. Decomposition rates increase with decreasing pH value and increasing temperature. The persulfate anion, independent of the cation, undergoes further decomposition in normal water or acid conditions, readily oxidizing water to oxygen, producing sulphate and hydrogen ions. All persulfate decomposition products are ubiquitous to the environment. Hydrolysis is metal catalyzed, and rapid reaction with organic matter is also possible. Therefore long-term toxicity testing of fish is scientifically unjustified.