4-cyclohexyl-4-methylpentan-2-one

Ecotoxicological Summary

Conclusion on classification

Classification was done according to the criteria described in the CLP regulation EC No 1272/2008, version 2016.

Acute aquatic hazard:

For classification acute toxicity data are available for aquatic invertebrates (Daphnia) and algae:

Daphnia: EC50 (48h) = 2.07 mg/L

Algae: ErC50 (72h) = 2.13 mg/L

The lowest EC50 value was observed for daphnia, which is hence the most sensitive species although the difference between daphnia and algae is minimal. According to Table 4.1.0 (a) the substance should not be classified for acute aquatic hazard, as the lowest EC50 (48h) for daphnia = 2.07 mg/L, is larger than the cut-off for classification of 1 mg/L.

Chronic aquatic hazard

For chronic classification, there are only chronic data available for one trophic level, algae. As described in Figure 4.1.1 in the CLP regulation (EC No 1272/2008, version 2016), the most stringent outcome of classification according to Table 4.1.0 (b) (i) or (ii) and (iii) should be used.

Table 4.1.0 (b) (i):

The substance is not readily biodegradable, hence Table 4.1.0 (b) (i) applies.

The 72h ErC10 for algae was 1.68 mg/L. Therefore, the substance should not be classified for chronic aquatic hazard. as the ErC10 is larger than the cut-off for classification of 1 mg/L.

Table 4.1.0 (b) (iii):

The substance is not readily biodegradable, the acute EC50 values for algae and invertebrates are both between 1 -10 mg/L, therefore the substance meets the criteria for classification for chronic aquatic hazard category 2.

Most stringent classification:

The conclusion of both assessment is that the substance should be classified for chronic aquatic hazard category 2.