Dipotassium peroxodisulphate

Endpoint summary

Additional information

The Persulfate Category includes molecules with similar chemical structure and similar physico-chemical properties. Persulfates are inorganic compounds which differ only by the cationic part of the salt. The cationic part is not expected to influence the hazardous properties of the molecule. The anionic part is identical and, therefore, the three salts are expected to display the same environmental, ecotoxicological and toxicological behaviour.

Short-term toxicity to fish

The acute toxicity to fish was tested in four studies. The most sensitive studies were with diammonium persulfate to Poecilia reticulate according to OECD guideline 203 and to Scophthalmus maximus. The tests revealed a LC50 (96 h) for freshwater of 76.3 mg/L and a LC50 (96 h) for marine water of 107.6 mg/L.

Long-term toxicity to fish

Long-term toxicity testing to fish was considered scientifically unjustified, due to the results obtained in the short-term toxicity to fish studies, the substance physical-chemical properties and hydrolysis behaviour.

Short-term toxicity to aquatic invertebrates

The toxicity of Persulfate Category to aquatic invertebrates was tested in eight studies. The acute toxicity to Daphnia magna with diammonium persulfate according to FIFRA guideline 72-2 of the pesticide assessment guidelines revealed the most sensitive EC50 (48 h) of 120 mg/L. In the marine study with saltwater invertebrate Abra alba according to PARCOM Ring test protocol an EC50 (5 d) of 11 mg/L was detected.

Long-term toxicity to aquatic invertebrates

The long-term toxicity of the Persulfate Category to aquatic invertebrates was tested with diammonium peroxodisulphate (APS). Based on the results of this 21-day chronic toxicity study, the test item had significant influence on the reproductive output of Daphnia magna. The determined NOEC and LOEC based on nominal concentrations for reproduction were 20.8 mg/L and 39.5 mg/L. An EC10 and EC50 of 25.9 mg/L (95% confidence limit: 9.7 - 35.1 mg/L) and 44.0 mg/L (95% confidence limit: 31.5 - 67.8 mg/L) for reproduction was observed, respectively. For mortality a NOEC vaule of 39.5 mg/L and a LOEC value of 75.0 mg/L was observed.

Toxicity to algae

Toxicity to algae was assessed in studies according to OECD guideline 201. One study was available for disodium persulfate and three for diammonium persulfate. A read across approach was applied for dipotassium persulfate, assuming that substances of the Persulfate Category exhibit similar ecotoxicological properties. For substances of the Persulfate Category the worst case salt water growth rate EC50 (72 h) value was 320 mg/L with a NOEC (72 h) value of 32 mg/L.

Toxicity to microorganisms

The toxicity to microorganisms of the Persulfate Category was assessed with diammonium persulfate in a growth inhibition study to Pseudomonas putida. The test revealed an EC10 (18 h) of 36 mg/L.

Toxicity to sediment organisms

The performance of the sediment toxicity test was considered scientifically unjustified, as aquatic toxicity is low and the chemical safety report indicates that there is no risk to sediment organisms.