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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Norethisterone in a saturated solution (approx. 7.8 mg/L) had no inhibitory effect on the growth of Pseudomonas putida. The growth inhibition of the reference substance was in good agreement with the historical data base of this laboratory.

Key value for chemical safety assessment

EC10, LC10 or NOEC for microorganisms:
7.8 mg/L

Additional information

"Should read: > 7.8 mg/L"

The slight increase of growth is not considered to be relevant in ecotoxicological terms, since the test is not designed to assess growth-stimulating effects.