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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

18h NOEC (Pseudomonas putida) = 550 mg/L (growth inhibition)

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
550 mg/L

Additional information

Since no reliable toxicity tests with microorganisms are available for C16-18 and C18 unsatd. AS Na (CAS 1394155-71-5), in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a read-across to another structurally related category member was conducted. Read-across data from C16-18AS Na (CAS 68955-20-4) were used, since toxicity of alkyl sulfates is dependent on the carbon chain length.

One reliable study with Pseudomonas putida is available for C16-18AS Na (CAS 68955-20-4). The key study (Steber 1988) followed the procedure of cell multiplication inhibition test according to Bringmann and Kühn (1977). The growth inhibition of Pseudomonas putida was recorded after 18 hours of exposure to the test substance. The 18-hour NOEC value was determined to be 550 mg a.i./L (nominal concentration).

Due to structure and property similarities with the tested category member it can be concluded that the above result applies also to C16-18 and C18 unsatd.AS Na (CAS 1394155-71-5). The 18-hour NOEC value for microorganisms is 550 mg/L. This value was used for the PNEC STP derivation for C16-18 and C18 unsatd.AS Na (CAS 1394155-71-5).