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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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) and by using scientific argumentation (sediment dwelling organisms).

For the environmental hazard assessment of the substance acute toxicity studies for freshwater fish, daphnids, freshwater algae and STP microorganisms are available for the corresponding sodium salt of the substance. These are used for read-across to the substance registered.The substance has a pKa of 0.18 which means that it will be completely dissociated under environmental conditions. Both the free potassium and sodium ions have a lower aquatic toxicity than1,2-bis(2-ethylhexyloxycarbonyl) ethanesulphonate. The presence of either of the counterions sodium or potassium is not considered to have an impact on the aquatic toxicity. It is therefore considered justified to use the data of the sodium salt for read across to the Potassium salt of 1,2-bis(2-ethylhexyloxycarbonyl) ethanesulphonate.

 

Long-term studies for fish and daphnids are waived. Experimental information about toxicity on marine organisms is not available.

Some of the above studies were conducted with test materials which contained the read across substance, docusate sodium, at > 80%. The majority of the acute aquatic studies, was however performed with Docusate Sodium containing formulations. These test materials contained typically between 64 and 70 % Docusate Sodium. For the assessment of all available studies it was assumed that neither synergistic nor antagonistic effects influenced the toxicity of Docusate Sodium and - as worst case scenario - the toxicity observed for the test material is only due to the toxicity of Docusate Sodium. The concentration of Docusate Sodium in the respective test materials was used to calculate the effect concentrations for Docusate Sodium.

The short-term EC50/LC50 values for fish, Daphnia, algae and microorganismswere 49, 6.6, 82.5 and 164 mg/L, respectively.

The substance is ready biodegradable, has a log Pow of < 3, has a low Koc resulting in a low likelihood to partition to soil and sediment and is only moderately toxic to pelagic aquatic organisms. Therefore, the substance is not expected to cause adverse effects on soil and sediment organisms. Consequently, the equilibrium partitioning method is used to assess the hazard of Potassium 1,2-bis(2-ethylhexyloxycarbonyl) ethanesulphonate to soil and sediment-dwelling organisms.

The daphnids were observed to be the most sensitive trophic level with an acute EC50 of 6.6 mg /L. This value will be used as worst case for the risk assessment of aquatic organisms.