Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
no hazard identified

Marine water

Hazard assessment conclusion:
no data: aquatic toxicity unlikely

STP

Hazard assessment conclusion:
no data: aquatic toxicity unlikely

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
3.85 mg/kg sediment dw
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.385 mg/kg sediment dw
Assessment factor:
1 000
Extrapolation method:
assessment factor

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
no exposure of soil expected

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
PNEC oral
PNEC value:
66.7 mg/kg food
Assessment factor:
300

Additional information

The soil PNEC has not been derived as direct emissions to soil are considered unlikely and indirect emissions very limited and negligible compared to other routes of emission. Given the very low vapour pressure of the substance, the air PNEC has not been derived as the air compartment is not expected to be a relevant route of exposure. The decision not to derive freshwater, marine or STP PNECs was based on the available acute and chronic toxicity data, which show that polysulfide di-tert-nonyl does not exhibit toxicity at the limit of water solubility.

The sediment PNECs have been derived by assessment factor based on results from an OECD 218 study withChironomus riparius,read across from polysulfide di-tert-dodecyl.

The secondary poisoning PNEC has been derived on the basis of data read across from polysulfide di-tert-dodecyl. These substances are polysulfides, characterised by hydrocarbon compounds containing one or more groups of atoms of the element sulphur linked together by covalent bonds. Given that the partition coefficient for the two substances is very similar, with polysufide di-tert-nonyl having a log Kow of >5.2 and polysulfide di-tert-dodecyl having a log Kow of >6.2, it is expected that the substances would behave similarly in the aquatic environment. Therefore, read across between the polysulfides for secondary poisoning is considered to be justified.

Conclusion on classification

Acute ecotoxicity studies are available for fish, Daphnia and algae for polysulfides di-tert-nonyl itself, or the appropriate read across substance polysulfides, di-tert-dodecyl. Based on this dataset one can conclude that polysulfides di-tert-nonyl has L/EC50s above its water solubility limit. However, as the substance is very poorly soluble, chronic ecotoxicity studies were conducted with fish andDaphnia, with the test item polysulfides, di-tert-dodecyl. There were no biologically significant effects in either study at the limit test concentration, which was slightly above saturation. These results are read across to polysulfides, di-tert-nonyl. As both acute and chronic ecotoxicity studies determined no significant effects at the limit of solubility of the test item, polysulfides, di-tert-nonyl is not classified for environmental endpoints.