Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.24 µg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
0.002 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.024 µg/L
Assessment factor:
10 000
Extrapolation method:
assessment factor

STP

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

Sediment (freshwater)

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

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.094 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:
PNEC soil
PNEC value:
18.1 µg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

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

Additional information

Conclusion on classification

Acute toxicity studies on fish, invertebrates, and algae are available for polysulfides, di-tert-bu. From the available fish study, no quantitative exposure/effect relationship could be established: there is uncertainty on exposure concentrations from analytical measurements but qualitatively no mortality or sub-lethal effect was observed at a concentration equeivalent to the one producing 50% immobilisation of daphnia (EC50 -48h = 0,24 mg/L). Therefore invertebrates are more sensitive than fish. With respect to algae, the ErC50 -72h = 0.84 mg/L, slightly above the result for invertebrate.

Based on these resultss, in the range 0.1 - 1 mg/L, polysulfides, di-tert-bu is to be classified as very toxic to aquatic organisms as regards acute effects. Moreover, polysulfides, di-tert-bu is not ready biodegradable and its log Pow value is 5.6

Polysulfides, di-tert-bu is not classified in annex I of the former 67/548/EEC directive (DSD) but according to the criteria it can be self-classified as N-R50/53. According to regulation 1272/2008/EC (CLP) criteria, it has to be self-classified as "Aquatic Chronic Category 1." For mixtures containing the substance a multiplying factor M = 1 should be used.