Registration Dossier
Registration Dossier
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EC number: 201-207-0 | CAS number: 79-43-6
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), a long-term fish study and by using scientific argumentation (sediment dwelling organisms).
For the aquatic environmental hazard assessment of DCA acute toxicity studies for freshwater and marine fish, daphnids, marine and freshwater algae and STP microorganisms and a long-term fish study are available.
The above studies were performed with pure test materials which contained the submission substance at > 80%.
The short-term freshwater EC50/LC50 values for fish, Daphnia, algae and microorganisms were > 2000, 106, 1485 and 12250 mg DCA/L,respectively.The short-term marine EC50/LC50 values for fish and algae were 321.6 and 148.2 mg/L. The EC10 for marine algae was 39.9 mg/L
DCA is ready biodegradable, has a log Pow of < 3, has a low Koc resulting in a low likelihood to partition to sediment and is only moderately toxic to pelagic aquatic organisms. Therefore,DCA 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.
Daphnids were the most sensitive trophic level with an acute EC50 of 106 mg DCA/L. This was likely cauused by the reduction of the pH. As conservative measure, this value will be used also for the calculation of the PNEC freshwater and the PNEC sediment (freshwater). This conservative approach considers also for some experimental shortcommings in the test design of the tests with freshwater invertebrates and algae.
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