Registration Dossier
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EC number: 232-108-0 | CAS number: 7787-32-8
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
Barium fluoride will dissociate in aqueous solution to form barium and fluoride ions. Reliable chronic toxicity data for invertebrates are available for barium and fluoride.
A 21d-EC16 of 5.8 mg Ba/L (nominal values) is reported by Biesinger and Christensen (1972), which can be used for the estimation of a NOEC-value of 2.9 mg Ba/L (i.e., EC16/2; ECHA-guidance). This value translates to an 21d-NOEC of 3.70 mg BaF2/L. For fluoride the 21-day NOEC is 8.9 mg fluoride/L in Daphnia magna (arithmetic mean of two tests) corresponding to 41 mg BaF2/L
Based on these results it may conservatively be assumed that the toxicological moiety of concern for the long-term toxicity of BaF2 to invertebrates (if any) is barium and therefore the 21-d NOEC of 3.7 mg BaF2/L is considered in the freshwater CSA.
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 3.7 mg/L
Additional information
For barium fluoride no data on long-toxicity to aquatic invertebrates are available. As barium fluoride in water rapidly dissociates into barium and fluoride ions, it is these ions that are expected to be present in the environment and which will therefore be assessed. Reliable long-term toxicity data for aquatic invertebrates are available for barium and fluoride ions.
Barium
Biesinger and Christensen (1972) reported a nominal 21d-EC16 of 5.8 mg Ba/L for the water flea Daphnia magna. Measured concentration levels were not reported. According to ECHA Guidance, a NOEC can be estimated by dividing a reliable ECx by 2 when X refers to an effect between 10 and 20%. The 21d-EC16 of 5.8 mg Ba/L is compliant with this criterion. Thus, a NOEC of 2.9 mg Ba/L is derived for the reproduction of Daphnia magna in freshwater corresponding to the 21d-NOEC of 3.70 mg BaF2/L.
Fluoride
The EU RAR for hydroge fluoride summarises the findings of two long-term toxicity studies with Daphnia magna exposed to sodium fluoride. The two studies provide reproductive NOEC values of 3.7 and 14.1 mg fluoride/L. The arithmetic mean 21 -day NOEC of both studies is 8.9 mg fluoride/L corresponding to 41 mg BaF2/L
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