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Toxicity to microorganisms

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Description of key information

The toxicity of 4,4 -sulphonyldiphenol to microorganisms was assessed in an activated sludge respiration inhibition test according to OECD 209 [BASF SE, 2009]. The EC10  and EC50 (3h) determined to be 200 and 390 mg/L. 

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Additional information

4,4-sulphonyldiphenol was tested in the 3 -hour activated sludge test according to OECD test guideline 209 and EU-method C.11.

In comparison to the inoculum controls the respiration rate of the activated sludge was inhibited dose-dependently in the concentration range from 62.5 to 1000 mg/L, displaying inhibition rates from -17 up to 96 %. The respiration rate of the activated sludge was inhibited by 22 %, at 250 mg/L and by 70 % at 500 mg/L.

Based on measured inhibition rates the 3 -hour EC10, EC50 were calculated to be 200 and 390 mg/L.