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Hazard for aquatic organisms

Hazard for air

Hazard for terrestrial organisms

Hazard for predators

Additional information

Conclusion on classification

Two studies are available on dipotassium malonate: an acute daphnia study in accordance with OECD 202 and an algae study in accordance with OECD 201. These tests yielded the following results:

- daphnia 48h EC50 > 100 mg/L (nominal concentration)

- algae 72h EC50 (growth rate) > 5.75 mg/L (measured, geometric mean)

The algae EC10 was not determined because the observed inhibition was below 20% for growth rate and below 50% for yield, and there was no concentration response relation observed. The NOEC was found to be 2.06 mg/L (measured, geometric mean).

Based on the criteria described in CLP section 4.1.2, classification for acute aquatic hazard is not required as the available EC50 values are > 1 mg/L.

With regard to long-term aquatic hazard, the classification needs to be determined in two ways, and the most stringent outcome to be retained:

i) based on the available chronic data for algae. As the EC10 is not determined, the NOEC of 2.06 mg/L (measured, geometric mean) is used as the starting point. Taking into account that the substance is readily biodegradable, dipotassium malonate does not need to be classified for long-term aquatic hazard.

ii) based on the available acute data. Based on the algae EC50 of > 5.75 mg/L (measured, geometric mean), and taking into account that the substance is readily biodegradable and has a log Kow < 4, classification for long-term aquatic hazard is not warranted.

In conclusion, classificaiton for environmental toxicity is not required.