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Toxicity to microorganisms

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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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