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Sediment toxicity

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Description of key information

NOECreproduction/biomass = 37.0 mg/kg sediment dry weight

Key value for chemical safety assessment

Additional information

Chronic test on sediment dwelling organisms (OECD 218):

In accordance with GLP regulations the toxicity of Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-,C7-9-branched alkyl esters to the sediment dwelling oligochaete Lumbriculus variegatus was investigated in a 28-day static sediment-water study (ECT 2006).


With respect to biomass and reproduction the test showed a clear dose-response relationship.

For the endpoint survival there was no dose-response relationship (no mortality was observed up to the highest concentration level). Therefore no LCx-values could be calculated.


The NOEC for the parameter reproduction and biomass was determined to be 37.0 mg/kg sediment dry weight (nominal). The LOECreproduction/biomass was 111.1 mg/kg sediment dry weight (nominal).


The mean measured initial recovery found in the water-sediment system (119.0%) was calculated from the recoveries found in samples of the analysed concentration levels on day 0 of the exposure phase. This mean initial recovery differed by less than 20% from the nominal concentrations, therefore the biological results were not corrected for measured concentrations but based on nominal concentrations instead.