Registration Dossier
Registration Dossier
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EC number: 231-830-3 | CAS number: 7758-02-3
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Sodium bromide is not considered toxic to algae based on the EC50 value of 440 mg/L. The NOEC was found to be >440 mg/L, based on a study with Skeletonema costatum.
Key value for chemical safety assessment
- EC50 for marine water algae:
- 440 mg/L
- EC10 or NOEC for freshwater algae:
- 3 200 mg/L
Additional information
Potassium bromide is an inorganic salt that dissociates to its composite ions in aqueous solutions at environmental pH and temperature. Comparison of the available data on the various bromide salts have shown that the bromide ion is the relevant ion for determination of the toxicological profile with simple cations such as potassium, sodium or ammonium, that are ubiquitous in nature, having little or no influence on the bromide ion properties. It is therefore justified to read-across data from other inorganic bromide salts to potassium bromide.
The key study is performed with marine species, Skeletonema costatum. Sodium bromide is not considered toxic to algae based on the EC50value of 440 mg/L and the NOEC >440 mg/L.
There are two supporting studies for freshwater species. NOECs were derived from acute and (semi) chronic toxicity tests with freshwater green algae, and (cyano)bacteria. The test results show that the organisms have a similar toxicity to NaBr as the NOECs ranged from 3200 mg NaBr/L to 4200 NaBr/L.
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