Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
4.1 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
25 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.082 mg/L
Assessment factor:
500
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
no data: aquatic toxicity unlikely

Sediment (freshwater)

Hazard assessment conclusion:
insufficient hazard data available (further information necessary)

Sediment (marine water)

Hazard assessment conclusion:
insufficient hazard data available (further information necessary)

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
insufficient hazard data available (further information necessary)

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

The examination of the PNEC values must be carried out with caution. This applies to the algal toxicity values, since it is well known and supported by numerous investigations that the growth-inhibiting effects of complexing agents and ion-exchanging materials, which are often observed in nutrient-poor, but also in standard culture-media of ecotoxicological standard tests, result from the depletion of trace metals essential for algal growth. For such substances, it is recommended to use a nutrient-enriched medium to avoid respective nutrient-depletion effects. Thus, it can be concluded that the inhibitory effect observed in nutrient-poor or standard test media is without any practical relevance and not to be considered as a toxic effect. Hence, EC50 values as well as NOEC values for algae were considerably overestimated by the available study, and consequently, this also applies for the derived PNEC values which represent an unrealistic worst-case scenario derived from laboratory experiments, but without practical relevance for natural environmental conditions. Therefore, the derived PNECs would not be suitable for a refined risk assessment.

Conclusion on classification