Registration Dossier

Administrative data

Hazard for aquatic organisms

Hazard for air

Hazard for terrestrial organisms

Hazard for predators

Additional information

Conclusion on classification

Short-term toxicity tests for algae and Daphnia are available for the substance. The EC50 value for Daphnia is 0.23 mg/l, whereas the ErC50 for algae is 1.9 mg/l. Based on the lowest available acute data for Daphnia with an EC50 value of 0.23 mg/L, the substance needs to be classified as Category acute 1 (H400) for aquatic toxicity according to Table 4.1.0 (a) of CLP.

As only one chronic value is available (algae ErC10 0.79 mg/l), the aquatic chronic classification needs to be derived on both chronic and acute toxicity data and the most stringent outcome needs to be taken into consideration. The lowest chronic value available is the ErC10 for algae being 0.79 mg/l. In combination with the substance not being rapidly degradable this would lead to classification in Category Chronic 2 (H411) according to Table 4.1.0 (b) (i) of CLP. In view of the acute daphnid result of 0.23 mg/l, the substance not being rapidly biodegradable and a log Kow of < 4 (3.69), the substance needs to be classified for long term aquatic toxicity according to Figure 4.1.1 and Table 4.1.0, (b) iii of CLP, resulting in aquatic Chronic Category 1 (H410) classification.

Overall, it can be concluded that Methyl nonyl ketone (MNK) needs to be classified as aquatic acute 1 (H400) and aquatic Chronic 1 (H410) in accordance with the criteria outlined in Annex I of the CLP Regulation (1272/2008/EC).

Based on this classification, an M-factor of 1 is indicated in accordance with the CLP regulation (Table 4.1.3)