Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

6.1.1: Short-term toxicity to fish:

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 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.

 

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 note here that the submitter of this dossier gain access to the lead dichloride dossier.

 

As stated above the LC50 value for the acute toxicity testing 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).

6.1.3: Short-term toxicity to aquatic invertebrates:

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).

6.1.5: Toxicity to aquatic algae and cyanobacteria:

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 a NOEC of 103mg/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 NOEC value for the acute toxicity testing of triethylmethylammonium tetrafluoroborate in algae is 103 mg/L.

 

For algae, 7 individual reliable freshwater acute toxicity data for various lead salts for one species were put forward for hazard assessment purposes. The acute toxicity values (48h-EC50) for Pseudokirchneriella subcapitata varied between of 21.7 µg dissolved Pb/L (at pH 7.5 and hardness of 24.2 mg/L) and 322.9 µg dissolved Pb/L (at pH 7.3 and hardness of 174.4 mg/L). 2 different chronic high quality no-effect levels for dissolved lead for freshwater algae situated between 34.1µg Pb/L and 93.0 µg Pb/L (Pseudokirchneriella subcapitata) were observed. High quality no-effect levels for dissolved lead for marine algae plants were situated between 52.9 µg Pb/L (Skeletonema costatum; endpoint: yield) and 1231.8 µg Pb/L (Dunaliella tertiolecta; endpoint: growth rate).

 

By using the lowest value of all these data, it can be concluded that for lead bis(tetrafluoroborate) the EC50for aquatic algae is ca. 40µg/L (worst case consideration).

6.1.7: Toxicity to microorganism:

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 a EC50of 550mg/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 potassium tetrafluoroborate (approx. 1.3g/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 toxicity testing in bacteria of potassium tetrafluoroborate was determined to 550 mg/L.

 

Short-term toxicity data for a soluble lead compound were extracted from literature for bacteria (heterotrophs and nitrifiers) and different protozoan species. 2 different no-effect levels for lead, between 1.06 and 2.92 mg/L (depending on the exposure time), were compiled for heterotrophic bacteria. For nitrifiers, 2 different no-effect concentrations, between 2.79 and 9.59 mg/L, were observed. 14 different short-term toxicity data were selected for protozoan species/communities. No-effect concentrations for protozoan communities varied between 1.0 and 7.0 mg Pb/L, while LC50 values for protozoan varied between <1.5 and >250.0 mg/L.

 

By using the lowest value of all these data, it can be concluded that for lead bis(tetrafluoroborate) the NOEC for acute toxicity to bacteria is ca. 1.8 mg/L (worst case consideration).