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Acutely toxic to aquatic organisms.

The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.

Reaction mass of bis(2-hydroxyethanaminium) sulfite and 2-(methylamino)ethanol - oxosulfane oxide (1:1) is soluble in water and dissociates to 2 -(methylamino)ethanol, (2- hydroxyethyl)ammonium and sulphite ions.

Since no studies on the aquatic toxicity of the substance are available, study reports and published literature about the toxic effects of 2-aminoethanol (CAS 141-43-5), 2 -(methylamino)ethanol (CAS 109 -83 -1) and substances of the sulphite category (e.g. sodium sulphite, CAS 7757-83-7) have been consulted alternatively.

Guideline studies from toxicity testing with the dissociation products and read-across substances are available for every endpoint, respectively. Fish was found to be the least sensitive organism with LC50 values > 100 mg/L retrieved from toxicity testing with 2-aminoethanol as well as with 2 -(methylamino)ethanol and the sulphite category members.

Effect concentrations for aquatic invertebrates were found to be in the range of 10 to 100 mg/L for 2-aminoethanol (i.e. EC50 = 65 mg/L), 2 -(methylamino)ethanol (EC50 = 33 mg/l) and disodium disulphite (i.e. EC50 = 74.9 mg SO32-/L), respectively.

Aquatic plants were found to be the most sensitive organisms with a detected ErC50 of 2.8 mg/L and a NOErC of 1 mg/L with the dissociation product 2-aminoethanol.

Effect concentrations for 2 -(methylamino)ethanol were in the range of 10 to 100 mg/L (i.e. ErC 50 = 28.1) .

Effect concentrations for sodium sulphite were in the range of 10 to 100 mg/L (i.e. ErC 50 = 36.8 mg SO32-/L; NOErC = 28 mg/L).

Data on the long-term toxicity of the dissociation products are available with all but one NOEC being above 1 mg/L. Chronic testing of 2-aminoethanol on Daphnia magna according to OECD guideline 211 resulted in a NOEC of 0.85 mg/L.

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