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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The effective concentration  (EC50) of Eicosanoic acid in the microorganism (Tetrahymena pyriformis) in a  24 hr study on the basis of population effect was estimated to be  as 5.85 mg/L.

Key value for chemical safety assessment

EC50 or LC50 for microorganisms:
5.85 mg/L

Additional information

No. of studies were reviewed for toxicity to microorganisms from reliable sources having Klimisch rating 2 and 4.

The summary of the results are presented below  

Sr.No

Endpoint

Effect values

Basis for effects

Duration

Species

Sources

1

EC50

5.85 mg/L

Population

24 hr.

Tetrahymena pyriformis

Predicted data from QSAR for target CAS : 506-30-9

2

EC50

75.387 mg/L

-

15 min.

Vibrio fisheri

Experimental data from Environmental Toxicology and Water Quality for RA CAS : 57-10-3

 

Based on the studies summarized in the above table for the target substance Eicosanoic acid and the read across substance, in microorganisms (Tetrahymena pyriformis and Vibrio fisheri),the endpoint value was found to vary between EC50 = 5.85 mg/L to 75.387 mg/L in a 15 min. to 24 hr. study on the basis of population effect.