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Valid data on n/i-C13 -C15 –aldehydes are available for the endpoints acute toxicity to fish and microorganisms as follows:

- Acute toxicity to fish: Based on mean measured concentrations, the 96 -h LC50 was >0.4 and <0.9 mg/L in an acute fish toxicity study using Tween 80 as emulsifier (Hoechst, 1994). As a surrogate an LC50 of 0.8 mg/L can be used for PNEC calculations based on the geometric mean of the LC0 (0.4 mg/L) and the LC100 (1.6 mg/L).

- Toxicity to microorganisms: n/i-C13 -C15 –aldehydes at 23.6 mg/L (nominal) was not toxic to microorganism (NOEC; Harlan, 2011).

Results from a structurally related substance (nonanal) may be used to cover the following endpoints:

- Acute toxicity to Daphnia magna: the 48-h EC50 was 1.54 mg/L (measured; Ward, 2003).

- Growth inhibiting on the green alga Selenastrum capricornutum in a 72 -h study according to OECD TG 201: the ErC50 was 4.5 mg/L (measured; Ward, 2003).

The data above indicate that N-/iso-C13-C15 aldehydes is acutely toxic to aquatic organisms to an extent that requires classification (GHS: Aquatic Acute 1; GHS: Aquatic Chronic 1).

The long chain N-/iso- C13-C15 aldehydes are poorly soluble in water (2 mg/L; cf. section 4.8), and the Log Pow is high (6 to 7; cf. section 4.7).