Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

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

Marine water

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

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
100 mg/L
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (freshwater)

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

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.031 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:
0.061 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

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

Additional information

In up-to-date assessment, latest and more reliable data are found and hence used for the estimation of PNEC values. Therefore the PNEC values reported here are different in comparison to the ones in EU-risk assessment (2008).

Conclusion on classification

According to the Directive 67/548/EEC and the regulation (EC) No 1272/2008, CBS is legally classified as R50/53 and aquatic acute 1 (H400) and aquatic chronic 1 (H410), respectively.

The up-to-date information confirmed this classification and is summarised below:

- The most sensitive acute and chronic toxicity is to aquatic algae (Selenastrum capricornutum): 72h- ECr50 of 0.15mg/L and a NOEC of 0.0084 mg/L (National Institute of Technology and Evaluation, 1996).

- Estimated log Pow of 5 (Currenta, 2010), which is higher than 3.

- CBS is not readily biodegradable (Bayer AG, 1989).

With the data listed above, CBS should be classified as aquatic acute 1 (H400) and aquatic chronic 1 (410) according to GHS (Regulation EC 1272/2008) and as R50/53 according the Directive 67/548/EEC. The appropriate multiplying factors for acute and chronic toxicity are 1 and 10, respectively.