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Description of key information

Experimental data show the test item has a 3 hour NOEC of 3.2 mg/L and EC50 of 612 mg/L for toxicity to aquatic microorganisms, a 72 hour NOEC of 32 mg/L and EC50 of >100 mg/L for algal growth inhibition and a 48 hour EC50 of 4.4 mg/L for toxicity to aquatic invertebrates.

As none of the acute effect concentrations are below 1 mg/L, the substance does not meet the criteria for acute aquatic toxicity category 1 under EU CLP. The NOEC for algal growth inhibition, the only chronic toxicity result, is above the chronic aquatic toxicity criteria for non-rapidly degradable substances of =<1 mg/L for chronic category 2. However, as only limited chronic ecotoxicity data are available, the acute toxicity data have been compared to the chronic classification criteria. As the lowest EC50 is 4.4 mg/L for aquatic invertebrates and the substance is not readily biodegradable, the substance meets the criteria for aquatic chronic category 2 classification. Therefore, the substance is classified for aquatic chronic toxicity category 2.

Additional information

Experimental data are available from three GLP-compliant, guideline studies. The toxicity to aquatic invertebrates was determined in a study following OECD guideline 202. Algal growth inhibition was determined in a study following OECD 203 and toxicity to aquatic microorganisms was determined in an OECD guideline 209 study on respiration inhibition.

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