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Ecotoxicological information

Ecotoxicological Summary

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Administrative data

Hazard for aquatic organisms

Freshwater

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

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.3 µg/L
Assessment factor:
100
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
0.9 mg/L
Assessment factor:
1
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
0.024 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.002 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
1 mg/kg soil dw
Assessment factor:
100
Extrapolation method:
assessment factor

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
PNEC oral
PNEC value:
0.03 g/kg food
Assessment factor:
30

Additional information

The PNEC derivation was as follows justified:

PNEC freshwater sediment:

K_(susp-water) = 1.97

RHO_(susp) = 1150

Conversion factor (wwt -> dwt): 4.6

PNEC_freshwater sediment

= (K_(susp-water) / RHO_(susp)) * PNEC_water * 1000

= (1.97/1150) * 0.003 * 1000

= 0.00514 mg/kg wwt

= 0.02364 mg/kg dw

 

PNEC marine water sediment:

K_(susp-water) = 1.97

RHO_(susp) = 1150

Conversion factor (wwt -> dwt): 4.6

PNEC_marine water sediment

= (K_(susp-water) / RHO_(susp)) * PNEC_marine water * 1000

= (1.97/1150) * 0.0003 * 1000

= 0.000514 mg/kg wwt

= 0.002364 mg/kg dw

Conclusion on classification

Acute aquatic toxicity:

96 h, LC50 (Salmo gairdneri): 27 mg/L (measured concentration)

48 h, EC50 (Daphnia magna): 47 mg/L (nominal concentration)

72 h, ErC50 (Scenedesmus subspicatus): 0.13 mg/L (nominal concentration)

Aquatic chronic toxicity:

72 h, ErC10 (Scenedesmus subspicatus): 0.03 mg/L (nominal concentration)

Biodegradation: readily biodegradable: 80 - 100 % after 28 days (% degradation in weight of evidence approach)

Partition coefficient: log Kow = 0.46 at 25 °C

Classification according to CLP

The available experimental test data are reliable and suitable for classification purposes under Regulation (EC) No 1272/2008. The test substance was found to be readily biodegradable in a weight of evidence approach. Acute and long-term test results reveal that algae are the most sensitive aquatic organisms. As their EC50 and EC10 values are more than two orders of magnitude lower than those for species of other trophic levels it is obvious that acrylic acid shows a specific toxicity to algae. The determined EC50 and EC10 for green algae were 0.13 mg/L and 0.03 mg/L, respectively. Based on these results, the substance is classified as short-term (acute) aquatic toxicity in Category 1 and is classified as long-term (chronic) aquatic toxicity in Category 2 according to Regulation (EC) No 1272/2008 (CLP), as amended for the twelfth time in Regulation (EU) 2019/521.