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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

The environmental hazard assessment for (fresh-) water organisms and sediment habitats is supported by several acute studies (pelagic compartment), by a chronic Daphnia study from a read across substance and by using scientific argumentation (sediment dwelling organisms).

For the environmental hazard assessment of the registered substance acute toxicity studies for freshwater fish, daphnids, freshwater algae and STP microorganisms are available. A long-term study is available from a read across substance. Long-term studies for fish are waived. Experimental information about toxicity on marine organisms is not available.

The short-term EC50/LC50 values for fish, Daphnia, algae were 0.73, 2.6 and 30 mg/L, respectively. STP microorganisms showed no toxic effects at 17 mg/L as determined in the toxic control of a readily biodegradation test.

The chronic Daphnia study with the read across source substance CAS 90268-36-3 resulted in an EC10 of 1.1. mg/L. The acute toxicity of CAS 147993-66-6 to daphnids was 5 times higher when compared to the acute Daphnia toxicity of CAS 90268-36-3, i.e., an EC50 of 13 mg/L vs. an EC50 of 2.6 mg/L for CAS 90268-36-3 and CAS 147993-66-6, respectively. This factor of 5 will be considered in the risk assessment for the PNEC calculation. For fish and algae the difference between both substances was smaller. Therefore, the factor of 5 was considered to be conservative.

The registered substance has a log Pow of << 3 resulting in a low likelihood to partition to sediment. Therefore, the registered substance is not expected to cause adverse effects on sediment organisms. Consequently sediment toxicity tests do not need to be conducted to assess the risk for sediment-dwelling organisms. The PNECs for these endpoints will be calculated using the partition coefficient method.

In short-term tests, fish were the most sensitive trophic level with an acute LC50 of 0.73 mg /L. The long-term EC10 from the chronic Daphinna study is EC10= 0.22 mg/L. This value will be used as worst case scenario for the risk assessment of aquatic organisms.