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Short-term toxicity to aquatic invertebrates

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Description of key information

Key value for chemical safety assessment

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No studies on environmental data for lead bis(tetrafluoroborate) exists. Since lead salts are very well examined and one study for tetrafluoroborate salts exists, which results in an EC50of 106mg/L, it was decided to read across from a soluble lead salt and a tetrafluoroborate salt in the forefront of the lead bis(tetrafluoroborate) dossier preparation.

 

Lead bis(tetrafluoroborate) is a soluble metal salt (> 500 g/L at 20°C; for more detailed information please refer to section 4.8 of this dossier). Read across is performed to the lead dichloride dossier (water solubility 10g/L at 20°C) and triethylmethylammonium tetrafluoroborate (> 2000 g/L at 20°C). It is note here that the submitter of this dossier gain access to the lead dichloride dossier.

 

As stated above the EC50value for the acute toxicity testing of triethylmethylammonium tetrafluoroborate in daphnia magna is 106 mg/L.

 

For invertebrates, 43 individual reliable acute toxicity data points for two different species performed with various lead salts were put forward for hazard assessment purposes. The acute toxicity values (48h-LC50) for Ceriodaphnia dubia varied between of 26.4 µg dissolved Pb/L (at pH 8.1 and hardness of 25 mg/L) and 3115.8 µg dissolved Pb/L (at pH 8.15 and hardness of 103.2 mg/L).The acute toxicity values (48h-LC50) for Daphnia magna varied between of 107.0 µg dissolved Pb/L (at pH 8.3 and hardness of 152 mg/L) and 108.8 µg dissolved Pb/L (at pH 7.6 and hardness of 54 mg/L).

 

By using the lowest value of all these data, it can be concluded that for lead bis(tetrafluoroborate) the EC50for aquatic invertebrates value is ca. 48µg/L (worst case consideration).