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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

Key value for chemical safety assessment

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No studies on aquatic toxicity for lead bis(tetrafluoroborate) exist. Since other inorganic lead salts are well examined and one study for tetrafluoroborate salts exists which results in an LC50of 760 mg/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 for the same reason as already discussed in the HH section.

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 potassium tetrafluoroborate (approx. 1.3 g/L at 20°C). It is explicitly noted here that the submitter of this dossier has obtained formal access to the lead dichloride dossier.

As stated above, the LC50 value for the acute toxicity of potassium tetrafluoroborate in fish (leuciscus idus) is 760 mg/L.

 

For soluble lead salts, 47 individual reliable acute toxicity data points for two different fish species were put forward for hazard assessment purposes. The acute toxicity values (96h-LC50) for Pimephales promelas varied between of 40.8 µg dissolved Pb/L (at pH 5.67 and hardness of 15.9 mg/L) and 3597.9 µg dissolved Pb/L (at pH 7.1 and hardness of 26 mg/L).The acute toxicity values (96h-LC50) for Oncorhynchus mykiss varied between of 107.0 µg dissolved Pb/L (at pH 8.8 and hardness of 290 mg/L) and 1170.0 µg dissolved Pb/L (at pH 6.9 and hardness of 32 mg/L).

 

By using the lowest value of all these data, it can be concluded that for lead bis(tetrafluoroborate) the LC50fish value is ca. 75 µg/L (worst case consideration).