Registration Dossier

Ecotoxicological information

Sediment toxicity

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

exposure considerations – There is no concern for exposure of sediment organisms to the test substance. The release of the long-chain alkyl methacrylate esters, e.g. C12MA into water is very limited due to the extremely low water solubility of < 1 µg/L at 25 °C according to US-EPA OPPTS 830.7860. Therefore, the expected hazard to sediment organisms is very low as the solubility of the substance drops under a certain trigger level for effects in the aquatic environment.

The absence of aquatic toxicity in the range of water solubility was demonstrated in regarding tests on algae and daphnia.

  

The low water solubility is further supported by the calculated log Kow of 6.68 which demonstrates a lipophilic character of C12MA. In fact, the water column can be regarded as a barrier.

However, if a low concentration of C12MA (< 1 µg/L) is released into water, the Mackay fugacity model demonstrates that 83.7% (m/m) remain in the waterbody and only 14.4% (m/m) partition into the sediment.

With respect to the water solubility of < 1 µ/L, the expected amount to be distributed into sediment would be negligible ( < 0.14 µg/L).

 

Furthermore, the substance is readily biodegradable and will not persist in sediment.

 

Consequently, no risk for sediment environment is assumed and further testing of sediment toxicity is not required.


Key value for chemical safety assessment

Additional information

There is no concern for exposure of sediment organisms to the test substance.

The release of the long-chain alkyl methacrylate esters into water is very limited due to the extremely low water solubility. Therefore, occurrence in the sediment will be very limited as well. Nevertheless, the esters are readily biodegradable and will not persist in sediment.