Registration Dossier
Registration Dossier
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EC number: 233-658-4 | CAS number: 10294-34-5
Toxicity to microorganisms
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 algae.
The "EC50" of pH = 5.0 to 5.5 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
Relevant information for the 2 degradation products:
Hydrogen chloride:
Inhibition of respiration rate of activated sludge: The EC50,3h value from a key study was pH = 5.0 to 5.5. NOEC: pH >6.0
An EC50,3h of ≥0.12 to ≥0.39 mg BCl3/L is calculated after converting to BCl3, if not only pure water is considered. NOEC ≥0.04 mg BCl3/L.
Boric acid:
Inhibition of respiration rate of activated sludge, lowest value from an acute test of reliable quality: An EC50,3h of >175 mg B/L equivalent to >1000 mg B(OH)3/L is reported. An EC50,3h = 1900 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 respiration inhibition of activated sludge. An EC50,3h of ≥0.12 to ≥0.39 mg BCl3/L is calculated after converting to BCl3, if not only pure water is considered. NOEC: pH ≥0.04 mg BCl3/L.
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