Oxacycloheptadec-10-en-2-one

Short-term toxicity to aquatic invertebrates

Description of key information

An acute immobilisation test was conducted for 48 hrs for assessing the effect of test chemical on Daphnia magna (Experimental study report, 2017). The test was performed in accordance to OECD guideline No. 202 “Daphnia sp., Acute Immobilization Test”. Own breeding stock at University of Chemistry and Technology, Prague of Daphnia magna was used as a test organism for the study. The stock solution 10.0 g/l was prepared by dissolving colourless liquid in acetone. Test solutions of required concentrations were prepared by mixing the stock solution of the test sample in reconstituted water.Nominal test chemical conc. used for the study were 0, 0, 0.6, 1.0, 1.7, 2.9, 4.9 and 8.3 mg/L, respectively. Study was performed using total 5 organisms per vessel/replicates in a static fresh water system. Daphnids were exposed to test chemical in 50 ml glass vessel in a volume of 25 ml of liquid solution containing both the chemical and media. The beakers were placed in a room at a temperature of 20±1°C. With the test substance one positive control Potassium dichromate (K2Cr2O7) was also run simultaneously. After the exposure of chemical, effect concentration EC50 was calculated using nonlinear regression by the software Prism 4.0. On the basis of the effect of test chemical on the mobility of the test organism Daphnia magna, the 48 hr EC50 value was determined to be 1.7 mg/l with a 95% confidence interval value ranging from 1.5 to 2.0 mg/l, respectively. Thus, based on the EC50 value, test chemical can considered as toxic to aquatic invertebrates. Since, the test chemical is readily biodegradable in water, chemical can be considered as non-toxic to aquatic invertebrate and thus can be considered to be not classified as per the CLP classification criteria.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates

Effect concentration:

1.7 mg/L

Additional information

Experimental study of the test chemical was reviewed for the short term toxicity to aquatic invertebrates end point which is summarized as below:

 

In an experimental study from study report (2017),an acute immobilisation test was conducted for 48 hrs for assessing the effect of test chemical on Daphnia magna. The test was performed in accordance to OECD guideline No. 202 “Daphnia sp., Acute Immobilization Test”. Own breeding stock at University of Chemistry and Technology, Prague of Daphnia magna was used as a test organism for the study. The stock solution 10.0 g/l was prepared by dissolving colourless liquid in acetone. Test solutions of required concentrations were prepared by mixing the stock solution of the test sample in reconstituted water.Nominal test chemical conc. used for the study were 0, 0, 0.6, 1.0, 1.7, 2.9, 4.9 and 8.3 mg/L, respectively. Study was performed using total 5 organisms per vessel/replicates in a static fresh water system. Daphnids were exposed to test chemical in 50 ml glass vessel in a volume of 25 ml of liquid solution containing both the chemical and media. The beakers were placed in a room at a temperature of 20±1°C. With the test substance one positive control Potassium dichromate (K2Cr2O7) was also run simultaneously. After the exposure of chemical, effect concentration EC50 was calculated using nonlinear regression by the software Prism 4.0. On the basis of the effect of test chemical on the mobility of the test organism Daphnia magna, the 48 hr EC50 value was determined to be 1.7 mg/l with a 95% confidence interval value ranging from 1.5 to 2.0 mg/l, respectively. Thus, based on the EC50 value, test chemical can considered as toxic to aquatic invertebrates. Since, the test chemical is readily biodegradable in water, chemical can be considered as non-toxic to aquatic invertebrate and thus can be considered to be not classified as per the CLP classification criteria.

 

Short term toxicity to aquatic invertebrates endpoint can also be considered for waiver as per in accordance with column 2 of Annex VII of the REACH regulation, testing for this end point is considered scientifically unjustified since there are mitigating factors indicating that aquatic toxicity is unlikely to occur as the substance is highly insoluble in water.