1-methyltrimethylene dimethacrylate

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.092 mg/L

Assessment factor:

100

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.13 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.009 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

20 mg/L

Assessment factor:

1

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

1.6 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.16 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:

0.573 mg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

PNEC aqua (freshwater)

Freshwater aquatic toxicity studies with 1,3-BDDMA were conducted in invertebrates (chronic) and algal species. The acute toxicity study with fish is currently being conducted. Additional acute fish toxicity was calculated based on QSAR prediction. Algae were the most sensitive trophic level in acute and chronic studies.

The PNEC aqua (freshwater) was based on the EC10 of 9.19 mg/L determined in an algal toxicity study with Desmodesmus subspicatus.

Two chronic study results are available for this substance, which cover two trophic levels (algae and invertebrates). Fish chronic data are not available. Therefore an assessment factor of 100 was applied to the EC10 (algae) to calculate the PNEC aqua (freshwater) in accordance with Guidance on information requirements and chemical safety assessment, Chapter R.10: Characterisation of dose [concentration]-response for environment, 2008.

 

PNEC aqua (marine)

No tests with marine species are available. The PNEC aqua (marine) was based on the EC10 of 9.19 mg/L determined in an algal toxicity study with Desmodesmus subspicatus. An assessment factor of 1000 was applied to the EC10 to calculate the PNEC aqua (marine) in accordance with Guidance on information requirements and chemical safety assessment, Chapter R.10: Characterisation of dose [concentration]-response for environment, 2008.

 

PNEC aqua (intermittent release)

The PNEC aqua (intermittent release) was based on the lowest acute toxicity value of 13.0 mg/L for Desmodesmus subspicatus (72 h EC50). Based on the available data set, an assessment factor of 100 was applied to the lowest EC50 to calculate the PNEC aqua (intermittent release) in accordance with Guidance on information requirements and chemical safety assessment, Chapter R.10: Characterisation of dose [concentration]-response for environment, 2008.

 

PNEC STP

PNEC STP was derived using an assessment factor of 1 applied to the test concentration at which no toxicity to the inoculum was observed in the toxicity control of the ready biodegradation tests (20 mg/L) and in read across with 1,3 -BDDMA tested in a Bringman Kühn test with pseudomonas putida at a concentration of 51.2 g/l which is above the water solubilty of the substance. Additionally, in a valid OECD guideline 301B biodegradation test including a toxicity control 47.4 mg/L of the test substance 1,3-BDDMA did not inhibit microbial activity.

 

PNEC sediment (freshwater, marine)

No toxicity data for sediment dwelling organisms are available. Thus, the PNEC for freshwater as well as marine sediment has been calculated with the equilibrium partitioning method using EUSES 2.1.

The following data have been taken into account for the calculation:

Molecular weight [g/mol]	226.27
Melting point [°C]	-23.00
Boiling point [°C]
Vapour pressure [hPa], 20°C	0.001
Water solubility [mg/L], 20°C	243
Log Kow	3.10
Koc (Kow method)	322.6
PNEC aqua, freshwater[mg/L]	0.087
PNEC aqua, marine [mg/L]	0.0087

 

 

PNEC soil

No toxicity data for soil organisms are available. Thus, the PNEC for freshwater as well as marine sediment has been calculated with the equilibrium partitioning method using EUSES 2.1.

The following data have been taken into account for the calculation:

Molecular weight [g/mol]	226.27
Melting point [°C]	-23.00
Boiling point [°C]
Vapour pressure [hPa], 20°C	0.001
Water solubility [mg/L], 20°C	243
Log Kow	3.10
Koc (Kow method)	322.6
PNEC aqua, freshwater[mg/L]	0.087

 

PNEC oral

A PNEC oral was not calculated for 1,3-BDDMA since the substance is readily biodegradable. The probability of being rapidly metabolised in exposed organisms is high. Together with the reported log Kow was 3.1 this indicates that there would be only little biomagnification of the test substance in the food chain.

Conclusion on classification

Based on the available reliable and relevant data, short-term toxicity values (L(E)C50) for daphnia and algae are >1 mg/L. 1,3-BDDMA does not need to be classified for acute toxicity to aquatic organisms according to EC No 1272/2008.

 The OECD 203 short term-fish is currently being conducted.

Based on the available reliable and relevant data, long-term toxicity values (EC10) for aquatic invertebrates and algae are > 1 mg/L, and 1,3-BDDMA is readily biodegradable. Thus, 1,3-BDDMA does not need to be classified for chronic toxicity to aquatic organisms according to Regulation EC No 1272/2008.