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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The inhibition of the degradation activity of activated sludge is not anticipated when 2-Ethylhexyl acrylate is introduced into biological treatment plants in appropriately low concentrations.
EC20 (30 min) > 1000 mg/L (domestic activated sludge, ISO 8192)
TTC = 2.3 mg/L (Chilomonas paramaecium, cell multiplication inhibition test)

Key value for chemical safety assessment

EC50 for microorganisms:
10 000 mg/L
EC10 or NOEC for microorganisms:
2.3 mg/L

Additional information

In a test with domestic activated sludge the inhibition of oxygen consumption was examined according to guideline ISO 8192 (BASF AG, 1988). After 30 minutes oxygen uptake was inhibited by 7 % at 1000 mg/L, the highest concentration tested. As no reference substance was tested and therefore, the sensitivity of the activated sludge is unknown, the test result should be used with care. EC20 > 1000 mg/L

In addition there is a test by BASF AG according to DIN 38 412 L 27 in which the inhibition of oxygen consumption for Pseudomonas putida exposed to 2-ethylhexyl acrylate for 30 minutes was studied (BASF 1988). Tween 80 was used as solubiliser. At the highest tested concentration of 10000 mg/L no inhibition of oxygen uptake was found. EC50 > 10000 mg/L

But the most sensitive microorganism to 2-ethylhexyl acrylate was the protozoan Chilomonas paramaecium with a 48-hour Toxicity Threshold of 2.3 mg/L determined in a cell multiplication inhibition test (Bringmann 1980). Although this species does not influence the degradation processes in a wastewater treatment plant itself, it is necessary for a proper function of a WWTP and therefore was used for derivation of the PNEC STP in the EU Risk Assessment (2005).

Taking all these test results into consideration, inhibition of the degradation activity of activated sludge in a WWTP is not anticipated when the substance is introduced in appropriately low concentrations in WWTPs.