Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.32 mg/L
Assessment factor:
10
PNEC freshwater (intermittent releases):
0.264 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.032 mg/L
Assessment factor:
100

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
10 mg/L
Assessment factor:
10

Sediment (freshwater)

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

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.157 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:
0.126 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
PNEC oral
PNEC value:
1.13 mg/kg food
Assessment factor:
30

Additional information

Conclusion on classification

Imidazolidine-2-thione was previously self-classified R52/53 according to 67/548 EC and chronic category III according to CLP due to the results mentioned hereafter:

 

  • Short term Toxicity to Fish: LC50-96h = 7500 mg/L
  • Short term toxicity to aquatic invertebrates: EC50-48h = 26.4 mg/L
  • Toxicity to aquatic algae: EC50 -72h > 100 mg/L
  • Imidazolidine-2-thione not readily biodegradable

 

However, the new chronic study performed on the most sensitive organisms allow us to remove this classification, as the chronic invertebrate NOEC was determined to be superior to 1 mg/L (in addition to the algae NOEC which is also superior to 1 mg/L). Therefore, Imidazolidine-2-thione is not classified anymore for environmental purposes.