1H-Pyrazole, 1,4-dimethyl-

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.1 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

1 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.01 mg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

1.1 mg/L

Assessment factor:

1

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.882 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.088 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:

0.117 mg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Conclusion on classification

1,4-Dimethyl-1H-pyrazole (CAS-# 1072-68-0):

Official classification regarding environmental hazards:

 

Aquatic compartment

 

In accordance with Regulation (EC) No 1272/2008, Annex VI Table 3.1 or Table 3.2: no data found

 

Self-classification:

 

Aquatic compartment

 

Following CLP, the substance is not to be classified as acutely hazardous to the aquatic environment.

 

Rationale:

The substance is not to be classified as acutely hazardous to the aquatic environment, since all acute effect values for the three trophic levels are greater than 1 mg/L.

 

Following CLP, the substance is not to be classified as chronically hazardous to the aquatic environment.

 

Rationale:

Chronic data are available only for algae. Therefore classification is based on the available chronic and acute toxicity data.

- Chronic toxicity data: The substance is not rapidly degradable and the ErC10 is >100 mg/L. According to the criteria outlined in Table 4.1.0(b) (i) (Commission Regulation (EU) No 286/2011 amending Regulation (EC) No 1272/2008) the substance is not to be classified as chronically hazardous to the aquatic environment.

- Acute toxicity data: Fish and aquatic invertebrates are the trophic levels which are not covered by chronic data. Therefore classification is based on the respective acute effect data. The LC50/EC50 values are > 100 mg/L, the substance is not rapidly degradable and the log Pow is < 4. According to the criteria outlined in Table 4.1.0(b) (iii) (Commission Regulation (EU) No 286/2011 amending Regulation (EC) No 1272/2008) the substance is not to be classified as chronically hazardous to the aquatic environment.

- Conclusion: The substance is not to be classified as chronically hazardous to the aquatic environment.

1,4-Dimethyl-1H-pyrazole - crude (composition: see IULCID chap. 1.2)

as methanol (CAS-# 67 -5 -1) is not classified as hazardous to the environment, the above reported classification for 1,4-Dimethyl-1H-pyrazole also applies to 1,4-Dimethyl-1H-pyrazole - crude.

The crude is not to be classified as acutely or chronically hazardous to the aquatic environment.

Atmospheric compartment

 

The test substance is not in Annex I of Regulation (EC) 2037/2000 on substances that deplete the ozone layer.

 

The test substance does not belong to the greenhouse gases listed in P Forster, PV Ramaswamy et al. Changes in Atmospheric Constituents and in Radiative Forcing. In: Climate Change 2007: The Physical Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change.