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EC number: 250-418-4
CAS number: 30989-05-0
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).
Some of the above studies were conducted with test materials which contained the submission substance at > 80%. The majority of the acute aquatic studies, however, was performed with B-TEGME containing mixtures. These test materials, i.e., methyl borated esters and brake fluids, contained 22 and 17% B-TEGME, respectively. The tests were typically conducted up to 1000 mg test material/L, corresponding to 170 and 220 mg B-TEGME/L. For the assessment of these studies it is assumed that neither synergistic nor antagonistic effects influence the toxicity of B-TEGME and - as worst case scenario - the toxicity observed for the mixture is only due to the toxicity of B-TEGME. The concentration of B-TEGME in the respective mixtures was used to calculate the effect concentrations for B-TEGME.
The (acute) LC50 and EC50 values for (freshwater) fish, daphnids algae were > 222.4, >211.2 and >224.4 mg B-TEGME/L. The EC50 for STP microorganisms was > 1000 mg/L.
Experimental information about toxicity on marine organisms is not available.
Based on the facts that B-TEGME is ready biodegradable, hydrolyses quickly, has a log Pow of << 3, has a low Koc resulting in a low likelihood to partition to sediment and is not toxic to pelagic aquatic organisms, B-TEGME is not expected to cause adverse effects on sediment organisms and consequently sediment toxicity tests do not need to be conducted to assess the risk for sediment-dwelling organisms.
Experimental results and scientific assessments indicate that Daphnia magna was the most sensitive species of the aquatic compartment with an EC50 of > 211.2 mg B-TEGME/L. Hence, the most conservative, worst case endpoint for the freshwater aquatic environment is 211.2 mg B-TEGME/L.
This value is well above the limit of 100 mg/L for classification and labeling, i. e., higher than 100 mg B-TEGME/L. No mortality occured until a concentration of 100 mg/L. Therefore, no hazard was identified.
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