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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

EC50 (3h) > 100 mg/l

Key value for chemical safety assessment

Additional information

A study on the toxicity potential of Acid Blue 193 to microorganisms in avaiable. It was not possible to retreive the detailed composition of the tested substance, thus it cannot be confirmed if the composition was comparable to those currently placed on the market; it's only known that it was a concentrated sample. Although the uncertainty related to tested composition, the study has been included into the dossier, for completeness sake.

The toxicity to microorganisms was assessed using aerobic activated sludge from a domestic waste-water treatment plant. The respiration rate of the sludge was slightly inhibited (33 %) at the highest concentration of test item. Respiration rate was inhibited to a minor extent (5 %) at concentrations of the standard up to 3.2 mg/l. The IC50 was found to be about higher than 100 mg/l.

In addition, a sheet of testing results is availabe. No details about testing method, procedures and results are given, thus a reliability cannot be assigned. Anyway, the information reported are consistent with those obtained into the key study. The EC50 (3h) value was indicated to be higher than 100 mg/l for microorganisms (reference given in attachment).