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EC number: 203-583-1 | CAS number: 108-44-1
- 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
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
- Endpoint:
- bioaccumulation in aquatic species: fish
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Study period:
- 2002
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with national standard methods with acceptable restrictions
- Justification for type of information:
- 1. HYPOTHESIS FOR THE ANALOGUE APPROACH
The read-across approach should be used to support the assessment of m-toluidine (3-methylaniline, CAS No. 108-44-1, EC No. 203-583-1) and data gap filling using fate and (eco)toxicity data of p-toluidine (4-methylaniline, CAS No. 106-49-3, EC No. 203-403-1). Together with the o-toluidine (2-methylaniline, CAS No. 95-53-4, EC No. 202-429-0), they make up the structural isomers of methylated aniline. The different substitution pattern lead to minor difference in chemical reactivity of the substances.
It is reasonable to assume and experimentally verified that source and target substance have nearly identical behavior in physico-chemical and (eco) toxicological studies. Studies regarding o-toluidine allow a comprehensive data evaluation, supporting the read-across approach and clarifying the quantitatively similar effects of the substances. While all three isomers exhibit effects in the same range, no clear tendency can be derived. However, in some effects, p-toluidine is slightly stronger than the other isomers. Therefore, the read-across also considers the worst-case approach.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
All substances are structural isomers of methylated aniline. The structures consist of a benzene ring, a methyl group and an amino group, substituted directly to the ring. They have a clear identity with high purity ( > 99 %). (see Justification Document for Details.)
3. ANALOGUE APPROACH JUSTIFICATION
Source and target substances are isomers of methylated aniline. The structures consist of a benzene ring, a methyl group and an amino group, connected directly to the benzene ring. All isomers employ the same empirical formula: C7H9N, and molecular weight: 107.1531 g/mol. A methyl group is substituted either in meta- or in ortho- or para- position to the amino group of the aniline ring. Source and target substances are isomers and therefore have very similar chemical structures and can be regarded as homologous structures. The only difference between both substances is displayed by the position of the methyl group. In addition to only little differences in structure between these substances, there are further data, which confirm the similarity concerning behavior. Due to the common structural aspects, the main physico-chemical parameters like vapour pressure, water solubility, octanol/water partition coefficient, organic carbon partition coefficient and dissociation constant are in the same range.For m-toluidine and p-toluidine, the main ecotoxicological parameters like short-term toxicity on Daphnia and fish, toxicity on algae, and long-term toxicity on Daphnia are in the same range. It is shown that Daphnia is the most sensitive aquatic organism for both isomers.
Overall, based on the comparable composition of source and target, their similar physico-chemical properties and ecotoxicological effects the read-across approach for assessment of the boiconcentration factor and the long-term toxicity towards fish is justified. - Reason / purpose for cross-reference:
- read-across source
- Guideline:
- other: "Bioaccumulation test of chemical cubstance in fish and shellfish", order of the prime minister, the minister of health and welfare, the minister of international trade and industry No 1, Japan, 1974
- Principles of method if other than guideline:
- This guideline corresponds to OECD Guideline 305C (Bioaccumulation: Test for the degree of bioconcentration in Fish), 1981
- GLP compliance:
- not specified
- Test organisms (species):
- Cyprinus carpio
- Route of exposure:
- aqueous
- Test type:
- flow-through
- Water / sediment media type:
- natural water: freshwater
- Total exposure / uptake duration:
- 28 d
- Nominal and measured concentrations:
- 10 and 100 µg/L (nominal)
- Type:
- BCF
- Value:
- < 1.3
- Remarks on result:
- other: Conc.in environment / dose:100 µg/l
- Type:
- BCF
- Value:
- < 13
- Remarks on result:
- other: Conc.in environment / dose:10 µg/l
- Validity criteria fulfilled:
- not specified
- Remarks:
- Since the test is poorly reported the validity criteria cannot be assessed sufficiently. Nevertheless the test is considered as valid based on the data given.
- Conclusions:
- With a BCF of < 1.3 at 100 µg/L and < 13 at 10 µg/L the substance has a very low potential for bioaccumulation.
- Executive summary:
As there is no data available for m-toluidine, read across with p-toluidine (CAS No. 106-49-0) is proposed to cover this endpoint. m-Toluidine and p-toluidine are isomers and have very similar chemical structures. Their main physico-chemical parameters (vapour pressure, water solubility, octanol/water partition coefficient, organic carbon partition coefficient and dissociation constant) are in the same range. The main ecotoxicological parameters like short-term toxicity on Daphnia and fish, toxicity on algae, and long-term toxicity on Daphnia are also in the same range. It is shown that Daphnia is the most sensitive aquatic organism for both isomers. Therefore a read across between these two substances to cover physico-chemical and ecotoxicological endpoints for m-toluidine seems to be justified. More details regarding the read across justification are depicted in the annex of the Chemical Safety Report (CSR).
According to a guideline which corresponds to OECD Guideline 305C (Bioaccumulation: Test for the degree of bioconcentration in Fish), a BCF of < 1.3 at 100 µg/L and < 13 at 10 µg/L was determined on fish (Cyprinus carpio) for p-toluidine. The test was conducted by EA, Japan: "Investigation of the Ecotoxicological Effects of OECD High Production Volume Chemicals", Office of Health Studies, Environmental Health Department, Environment Agency, Japan.
Reference
judgement: low bioconcentration
lipid content of fish
- start of testing: 2.80%
- end of testing: 2.95%
Description of key information
With a BCF of < 1.3 at 100 µg/L and < 13 at 10 µg/L the substance has a very low potential for bioaccumulation.
Key value for chemical safety assessment
- BCF (aquatic species):
- 13 dimensionless
Additional information
As there is no data available for m-toluidine, read across with p-toluidine (CAS No. 106-49-0) is proposed to cover this endpoint. m-Toluidine and p-toluidine are isomers and have very similar chemical structures. Their main physico-chemical parameters (vapour pressure, water solubility, octanol/water partition coefficient, organic carbon partition coefficient and dissociation constant) are in the same range. The main ecotoxicological parameters like short-term toxicity on Daphnia and fish, toxicity on algae, and long-term toxicity on Daphnia are also in the same range. It is shown that Daphnia is the most sensitive aquatic organism for both isomers. Therefore a read across between these two substances to cover physico-chemical and ecotoxicological endpoints for m-toluidine seems to be justified. More details regarding the read across justification are depicted in the annex of the Chemical Safety Report (CSR).
According to a guideline which corresponds to OECD Guideline 305C (Bioaccumulation: Test for the degree of bioconcentration in Fish), for p-toluidine a BCF of < 1.3 at 100 µg/L and < 13 at 10 µg/L was determined on fish (Cyprinus carpio) for p-toluidine. The test was conducted by EA, Japan: "Investigation of the Ecotoxicological Effects of OECD High Production Volume Chemicals", Office of Health Studies, Environmental Health Department, Environment Agency, Japan.
An experimentally determined logKow of 1.4 for m-toluidine supports this consideration that the substance has a low potential for bioaccumulation.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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