Registration Dossier
Registration Dossier
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EC number: 237-222-4 | CAS number: 13701-59-2
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
In a limit test no significant inhibition of micro-organisms was observed at 100 mg/L. As such, the NOEC was determined to be 100 mg/L and the EC50 was determined to be >100 mg/L.
Key value for chemical safety assessment
- EC50 for microorganisms:
- 100 mg/L
- EC10 or NOEC for microorganisms:
- 100 mg/L
Additional information
A 3 -hour activated sludge respiration inhibition test was conducted for barium diboron tetraoxide. The test was carried out according to OECD guideline 209. Activated sludge from a domestic wastewater treatment plant was exposed to the test substance at a concentration of 100 mg/L. Six controls (tap water, synthetic sewage and inoculum, but without addition of test item) were tested in parallel. 3,5 -dichlorophenol was used as a reference substance.
The respiration rates of the activated sludge treated with the test item at a concentration of 100 mg/L differed by less than 10% from control. Therefore Barium diboron tetraoxide at a concentration of 100 mg/L had no toxic effects on respiration activity of activated sludge. The NOEC s established to be100 mg/L and the EC50 was established to be >100 mg/L.
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