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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.

 

Since C10 is the main carbon chain length of the AES (C10 -12, 1 -2.5EO) Na (CAS 68610-66-2) mixture a read-across approach from structural comparable AES (C8-10, 1-2.5EO) mixtures was applied, where the carbon chain length C10 is the main component as well. To cover the acute toxicity of aquatic invertebrates a study results from the mixtures AES (C8-10, 1-2.5EO) Na is available. In this study an EC50 of 91 mg a.i./L for Daphnia magna was determined. The chronic invertebrates study was conducted with the AES (C8-10, 1-2.5EO) NH4 (CAS 160901-28-0) mixture. Based on reproduction a NOEC of 5.3 mg a.i./L for Daphnia magna was found. The algae endpoint was covered by a read-across approach from AES (C8-10, 1-2.5EO) NH4 (CAS 160901-28-0). In this study a NOEC value of 31.3 mg a. i /L was reported 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 determined 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).