Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.004 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
0.003 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:
1 000 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

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

Sediment (marine water)

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

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
0.057 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

In up-to-date assessment, latest and more reliable data are found and hence used for the estimation of PNEC values. This also led to the change in classification from R51/53 to R50/53.

Conclusion on classification

In Directive 67/548/EEC and the regulation (EC) No 1272/2008, 2-(morpholin-4-ylsulfanyl) -1,3-benzothiazole has been legally classified as "Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment" with the phrase of R 51/53 in Annex I and aquatic chronic 2 (H411), respectively. According to the up-to-date information listed below, a stricter self-classification has been proposed in this dossier as “Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment" with the phrase of R 50/53 and aquatic acute 1 (H400) and aquatic chronic 1 (H410).

- The most sensitive acute toxicity is to fish (Oncorhynchus mykiss): 96 hour-LC50 of 0.31 mg/L (Monsanto, 1981a).

- The most sensitive chronic toxicity of MBT (read-across of one main degradation product) was determined in a long-term study with fish (rainbow trout): NOEC (89d) of 0.041 mg/L (CMA, 1989).

- Measured log Pow of 3.4 (Currenta, 2010c), which is higher than 3.

- MBS is not readily biodegradable (Bayer AG, 1988a).

With the data listed above, MBS 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 both 1.