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EC number: 237-486-0
CAS number: 13814-96-5
specifically on the toxicity to microorganisms for lead
bis(tetrafluoroborate) exist. However, since lead salts are
well-examined and also 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 for
reasons already stated in the HH section.
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 explicitly noted here that the submitter of this
dossier has obtained formal 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.
Toxicity data to
bacteria (heterotrophs and nitrifiers) and different protozoan species
for a soluble lead compound were extracted from literature. 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).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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