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Long-term toxicity to fish

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Description of key information

NOEC (Pimephales promelas) between 0.11 mg/L and 1.357 mg/L

Key value for chemical safety assessment

Additional information

Since no reliable chronic fish test is available for C8-18AS Mg & TEA (CAS 85586-38-5), in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5, a read-across to another structurally related category members was conducted. Read-across data from C12AS Na (CAS 151-21-3) and C14-15AS Na (CAS 68081-98-1) were used. Toxicity of alkyl sulfates is dependent on the carbon chain length and the influence of the counter ion can be neglected.

A 42-day flow-through study with fathead minnow (Pimephales promelas) examining the toxic effect of CAS 151-21-3 is available (Belanger et al. 1995). Juvenile mortality and juvenile growth were determined in a non-GLP test after exposure to five concentrations up to 1.357 mg/L (measured concentration, equal to 2.1 mg/L of nominal concentration). Since no adverse effects were observed regarding fish survival and body weight, the NOEC value was determined as equal as or higher than 1.357 mg/L (measured concentration).

In two further studies fathead minnows (Pimephales promelas) were exposed to C14 -15AS Na (CAS 68081-98-1) which is considered as the worst case mixture for the whole alkyl sulfate category. The toxicity pattern observed for the alkyl sulfate category confirms that the toxic effects increase with the increasing carbon chain, the most toxic at C14-15. In the non-GLP study of Sousa (1987), which was conducted equivalent to OECD 210 guideline, fathead minnow was exposed to C14-15AS over 34 days in a flow-through system. The highest test concentration was 4.3 mg a.i./L (measured concentration equal to 6.0 mg a.i./L of nominal concentration). The early-life stage test resulted in the lowest NOEC-value of 0.11 mg a.i./L (measured concentration) for larvae survival. This result by Sousa corresponds well with the NOEC-value determined in a GLP-study of Versteeg and Rawlings (1997). In this test fathead minnows (Pimephales promelas) were exposed with the same C14-15AS Na mixture (56% C14 and 44% C15) in an outdoor flow-through system over 35 days. The exposure method is described as equivalent to OECD 53, guidance on simulated freshwater lentic field tests. The resulting NOEC-value is reported to be 0.371 mg/L for growth (length and weight).

Due to structural and property similarities with the tested category members it can be concluded that the above results apply also to C8-18AS Mg & TEA (CAS 85586-38-5). The toxicity of C14-15AS mixtures is considered as a worst case scenario for C8-18AS Mg & TEA (CAS 85586-38-5). The composition of C8-18AS Mg & TEA (CAS 85586-38-5) based on the normalized mean values of provided ranges is C8: 15.8%, C10: 15.8%, C12: 44.7%, C14: 15.8%, C16: 5.3% and C18: 2.6%. It can be concluded that the reliable NOEC value of C8-18AS Mg & TEA (CAS 85586-38-5) for fish is in a range above 0.11 mg/L and below 1.357 mg/L.