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The alkyl ether sulfates grouped within the AES category show similar structural, physico-chemical, environmental and toxicological properties. The approach of grouping different AES for the evaluation of their effects on human health and the environment was also made by the Danish EPA [1] and HERA [2], supporting the read across approach between structurally related AES.

The aquatic toxicity of the alkyl ether sulfates has been evaluated in studies on fish, invertebrates and algae as well as microorganisms. In most of the given studies AES were tested as sodium salts. As the kation counterpart of the AES anions is not expected to influence the ecotoxicological profile of the substance, read-across is possible between all comparable mixtures independent from the kation (e. g. sodium, magnesium, ammonium, MIPA; for details see category justification). Based on the available experimental data it is assumed that with increasing chain lengths also the toxicity increases. Therefore, using experimental data of AES with chain length >= C12 as a read-across for AES (C8-10, 1-2.5EO) Na it is considered as a worst case scenario.

For the hazard assessment of AES (C8-10, 1-2.5EO) Na short-term results of a Daphnia test are available. The determined EC50 value of this study was 91 mg a.i./L. The chronic toxicity on aquatic invertebrates and the toxicity on algae were covered by a read-across approach from AES (C8-10, 1-2.5EO) NH4 (CAS 68891-29-2). Based on reproduction an NOEC of 5.3 mg a.i./L for Daphnia magna was determined in the long-term aquatic invertebrates test. For algae a NOEC value of 31.3 mg a. i /L was found and the corresponding EC50 value was assumed to be > 100 mg a.i./L. To cover the acute toxicity on fish a read-across approach from AES (12-14, 1-2.5EO) Na (CAS 68891-38-3) was performed as a worst case scenario. The LC50 value reported in this read-across study was 7.1 mg a.i./L for fish.

 

 [1] Danish EPA - Environmental and Health Assessment of Substances in Household Detergents and Cosmetic Detergent Products (2001). Environmental Project No. 615, pp. 24-28

[2] HERA - Human & Environmental Risk Assessment on ingredients of European household cleaning products (2004). Alcohol Ethoxysulphates (AES).