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EC number: 256-170-3 | CAS number: 44914-03-6
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
48-hour EC50 (mobility): 5.65 mg/L (OECD 202)
Key value for chemical safety assessment
Additional information
Acute toxicity of 2-methylbutyl acrylate (2-MBA) to Daphnia magna was determined in a 48-hour study conducted according to OECD TG202 under GLP criteria. The key study is considered reliable without restriction. A supporting study of 2-MBA done under OECD TG202 (non-GLP, nominal concentrations) gave similar results, with a 48-hour EC50 of 7.5 mg/L. The 2-MBA results are similar to a supporting study for the analogous compound n-butyl acrylate (n-BA), which had a 48-hour EC50 (mobility) of 8.2 mg/L (study conducted under GLP according to USEPA OTS 797.1300). The n-BA study is considered reliable without restriction for n-BA, but as read-across to 2-MBA is reliable with restriction (Klimisch 2). Both acrylates are readily biodegradable, which would mitigate long-term toxicity under environmental conditions. 2-MBA and n-BA are acrylate esters which exert toxicity by virtue of electrophilic (Michael-type) addition to cellular nucleophiles such as glutathione(1)or cellular proteins(2). The result of this addition is glutathione depletion followed by oxidative damage to cells, or alternatively protein inactivation. Detoxification is by ester hydrolysis followed by downstream conversion and entry of acrylic acid to the citric acid cycle(3). n-Butyl acrylate (n-BA) differs from 2-MBA by the latter's additional methyl branch adjacent to the ester moiety on the alcoholic side of the molecule. Molecular weight, hydrophobicity and vapor pressure are similar between 2-MBA and n-BA. The entirely linear structure of n-BA is expected to be somewhat more amenable to esterase activity and beta-oxidation than the 2-methyl branched structure of 2-MBA. In addition, n-BA has a slightly lower log Kow. Taken together, n-BA may be slightly less toxic than 2-MBA with slightly faster detoxification (by ester hydrolysis), but is expected to have generally similar toxicity values.
References:
1. A. P. Freidig, H. J. M. Verhaar, J. L. M. Hermens. 1999. Comparing the Potency of Chemicals with Multiple Modes of Action in Aquatic Toxicology: Acute Toxicity Due to Narcosis versus Reactive Toxicity of Acrylic Compounds. Env. Sci. Technol. 33 (17): 3038–3043.
2. K. Chan & P. J. O’Brien. 2008. Structure–activity relationships for hepatocyte toxicity and electrophilic reactivity of a,b-unsaturated esters, acrylates and methacrylates. J. Appl. Toxicol. 28 (8): 1004–1015.
3. H. Greim, J. Ahlers, R. Bias, B. Broecker, H. Hollander, H.-P. Gelbke, S. Jacobi, H.-J. Klimisch, I. Mangelsdorf, W. Mayr, N. Schön, G. Stropp, P. Stahnecker, R. Vogel, C. Weber, K. Ziegler-Skylakakis, E. Bayer. 1995. Assessment of structurally related chemicals: Toxicity and ecotoxicity of acrylic acid and acrylic acid alkyl esters (acrylates), methacrylic acid and methacrylic acid alkyl esters (methacrylates). Chemosphere 31 (2): 2637–2659.
Data matrix – Analog approach (key study results only) |
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Target substance |
Source substance |
|
CHEMICALNAME |
2-methylbutyl acrylate |
n-butyl acrylate |
CAS# |
44914-03-6 |
141-32-2 |
Molecular formula |
C8H14O2 |
C7H12O2 |
Molecular Weight |
142.2 |
128.2 |
PHYSICO-CHEMICAL DATA |
||
Melting Point |
≤ -75 °C |
Not available |
Boiling Point |
161.7 °C at 1013hPa |
147 °C at 1013hPa |
Density |
0.8886 g/cm3 at 25 °C |
0.9 g/cm3 at 20.0 °C |
Vapour Pressure |
1.7 hPa at 20°C |
5 hPa at 22.2°C |
Partition Coefficient (log Kow) |
2.9 |
2.38 (at 25°C) |
Water Solubility |
316 mg/L at 23 °C |
Not available |
ENVIRONMENTAL FATE and PATHWAYS |
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Photodegradation |
DT50 1.04 d (AOPWIN v1.92) |
Not determined |
Stability in Water |
Adaptation, readily biodegradable |
DT50, 1100 day at pH 7, 25 °C (40CFR796.3500) |
Aerobic Biodegradation |
60% after 11 days (OECD 301D) |
80 - 90% after 28 days (OECD 310) |
Bioconcentration |
Not bioaccumulative |
Not bioaccumulative |
Transport and Distribution |
Koc 263 – 302 (Calculated by TGD method) |
Koc 40-148 (EPA OTS 796.2750) |
Henry's Law constant |
96 Pa*m3/mol at 23.1 °C |
Not determined |
ENVIRONMENTAL TOXICITY |
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Acute Toxicity to Aquatic Invertebrates (D. magna) |
48-hour EC50 (mobility) 5.65 mg/L (OECD 202) |
48-hour EC50 (mobility) 8.2 mg/L (EPA OTS 797.1300) |
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