Benzyl methacrylate

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.01 mg/L

Assessment factor:

100

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.005 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.001 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

1.33 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.423 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.042 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:

0.079 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 BNMA were conducted in fish, invertebrates, and algal species. Acute toxicity studies were conducted in fish and algae. Chronic studies are available for algae and invertebrates. Algae and daphnia magna were in the same range in chronic studies.

The PNEC aqua (freshwater) was based on the 21 day reproduction EC10 of 1.03 mg/L determined in a study with daphnia magna. An assessment factor of 100 was applied to the EC10 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 72 h growth EC10 of 1.08 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 withGuidance 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 2.28 mg/L for Pimephales promelas (72 h EC50). Based on the available data set, an assessment factor of 1000 was applied to the lowest EC50 to calculate the PNEC aqua (intermittent release) in accordance withGuidance on information requirements and chemical safety assessment,Chapter R.10: Characterisation of dose [concentration]-response for environment, 2008.

 

PNEC STP

No appropriate microbial inhibition test data are available for BNMA.

In a CO2 evolution OECD guideline 301B biodegradation test, the substance applied at a concentration of 13.3 mg/L was found to be readily biodegradable based on 74% degradation after 28 days. The results not only indicate the substance is readily biodegradable, but by default suggests no inhibition of microorganisms at 13.3 mg/L.

PNEC STP was derived using an assessment factor of 10 applied to the test concentration at which no toxicity to the inoculum was observed in the ready biodegradation tests (13.3 mg/L).

 

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]	176.22
Melting point [°C]	-22.00
Boiling point [°C]	243.00
Vapour pressure [hPa], 20°C	0.03
Water solubility [mg/L], 20°C	189.6
Log Kow	3.10
Koc (Kow method)	375.2
PNEC aqua, freshwater[mg/L]	0.0103
PNEC aqua, marine [mg/L]	0.00103

 

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]	176.22
Melting point [°C]	-22.00
Boiling point [°C]	243.00
Vapour pressure [hPa], 20°C	0.03
Water solubility [mg/L], 20°C	189.6
Log Kow	3.10
Koc (Kow method)	375.2
PNEC aqua, freshwater[mg/L]	0.103

 

Secondary poisoning

A PNEC oral was not derived for BNMA since the substance is readily biodegradable. The probability of being rapidly metabolised in exposed organisms is high. Together with the reported log Kow of 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 fish and algae are >1 mg/L. BNMA does not need to be classified for acute toxicity to aquatic organisms according to or Regulation EC No 1272/2008.

 

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