Registration Dossier
Registration Dossier
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EC number: 603-923-2 | CAS number: 135590-91-9
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
The substance is not expected to pose a risk to sediment organisms. The substance has a low adsorption potential (Koc range 486 – 823) and thus adsorption to sediment particles is not expected. The available aquatic toxicity tests demonstrated that the substance is not acutely very toxic to aquatic organisms. All available effect concentrations (EC/LC50) are > 1 mg/L . Furthermore, the substance is not expected to accumulate and persist in the sediment compartment. The available sediment simulation test demonstrated a degradation of the substance in natural water and sediment. A rapid hydrolysis of the substance by microbially induced processes was observed in the study with half-lives of 0.6 d in the water phase and 1.1 d for the tested water-sediment system. The determined metabolites of the parent substance were mono-and dicarboxylic acids and their salts.
Furthermore, according to Annex IX, column 2 of Regulation (EC) No 1907/2006, testing with sediment organisms does not need to be conducted as the Chemical Safety Assessment does not indicate a need for further investigations. According to Annex XI, Section 3 of Regulation (EC) No 1907/2006 toxicity tests on sediment organisms are considered not necessary. The exposure concentrations for the sediment compartment during the lifecycle of the substance are low. The environmental exposure assessment for the substance indicates no risk for the sediment compartment (all RCR< 1; please refer to Chapter 9 and 10 of the Chemical Safety Report for detailed information).
Supporting information on the sediment toxicity of a metabolites of the test item is available.
Data available for one of the major metabolites determined no toxic effects up to the highest tested concentration. The study was conducted according to OECD guideline 219. A static exposure regime was applied for 28 days using Chironomus riparius as test organisms. The test was set up in a water-sediment system using spiked water. Effects on emergence rate and development rate were not observed. The reported EC50 (28 d) was >50 mg/L (NOEC (28 d) 50 mg/L).
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