Registration Dossier
Registration Dossier
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EC number: 233-658-4 | CAS number: 10294-34-5
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
The decreased pH caused by the formation of HCl during hydrolysis of BCl3 is decisive for the acute toxicity to fish.
The "LC50" of pH = 3.25 is best described in pH-units and not by the concentration, in case of more or less buffered aquatic environments.
Key value for chemical safety assessment
Additional information
A degradation category approach is applied, based on the very rapid and complete degradation (hydrolysis) of boron trichloride in water to form hydrochloric acid and boric acid. The description and justification of the category is presented in Section 13. The endpoint results of the degradation products are transcribed to boron trichloride.
Relevant information for the 2 degradation products:
Hydrogen chloride:
The lowest fish LC50,96h value from a key study was pH = 3.25 (NOEC: pH 3.5). Normalised, this corresponds to 20.5 mg HCl/L in non-buffered water. An LC50,96h of ≥22 mg BCl3/L is calculated after converting to BCl3, if not only pure water is considered. NOEC ≥12 mg BCl3/L.
Boric acid:
Fish, Fathead minnow, lowest value from an acute test of reliable quality: LC50,96h = 456 mg B(OH)3/L. An LC50,96h = 864 mg BCl3/L is obtained after converting to BCl3.
Endpoint conclusion: The decreased pH caused by the formation of HCl during hydrolysis of BCl3 is decisive for the acute toxicity to fish. An LC50,96h of ≥22 mg BCl3/L is calculated after converting to BCl3, if not only pure water is considered. NOEC ≥12 mg BCl3/L.
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