Registration Dossier
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EC number: 232-164-6 | CAS number: 7789-41-5
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
In a publication by Vidakovic-Cifrek, Z. et al. EFFECTS OF CACL2 AND CABR2 ON GROWTH, PHOTOSYNTHETIC PIGMENTS AND ION ACCUMULATION IN DUCKWEED, the two higher concentrations (0.075 and 0.1 mol/l) of all three tested samples caused disturbed water content in plants after 14 days of cultivation.
In a static test, alga, Skeletonema costatum, was incubated for 72 hours in the presence of sodium bromide solution at 5 different concentrations. While growth and growth rates were reduced in the presence of sodium bromide solution, the percentage inhibition in growth rate remained below 50% at all time points, even at the highest concentration of sodium bromide solution of 1000.0 mg/L, unlike the reference substance which gave 60.7 % growth inhibition after 48 hours at a concentration of 1.5 mg/L. All EC50 and NOEC values were determined to be above this 1000.0 mg/L sodium bromide solution threshold.
Read across from NaBr to CaBr2 is possible due to the full dissociation of both compounds in water. Na+ and Ca2+ are not toxic in the concentration ranges where Br- is toxic. Therefore only the Br- is responsible for the toxicity effects.
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