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Diss Factsheets
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EC number: 209-057-8 | CAS number: 554-00-7
- 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
Phototransformation in water
Administrative data
- Endpoint:
- phototransformation in water
- Type of information:
- other: BUA report
- Adequacy of study:
- other information
- Reliability:
- other: BUA report
- Rationale for reliability incl. deficiencies:
- other: No reliability is given as this is a summary entry for the BUA report.
Data source
Referenceopen allclose all
- Reference Type:
- secondary source
- Title:
- 2,4-Dichloranilin; 2,5-Dichloranilin; 3,4-Dichloranilin
- Author:
- Beratergremium für umweltrelevante Altstoffe (BUA)
- Year:
- 1 994
- Bibliographic source:
- Wissenschaftliche Verlagsgesellschaft, BUA report 140
- Reference Type:
- publication
- Title:
- Ring test of a method for assessing the phototransformation of chemicals in water.
- Author:
- Lemaire J, Guth J. A., Klais O., Leahey J., Merz W., Philp J., Wilmes R., Wolff C.J.M.
- Year:
- 1 985
- Bibliographic source:
- Chemosphere 14, 53-77
- Title:
- No information
- Author:
- Mill T., Mabey W. R., Bomberger D. C. Chou T.-W., Hendry D. G., Smith J. H.
- Year:
- 1 982
- Bibliographic source:
- Environmental Protection Agency (EPA), EPA-600/3-82-022, USA
- Reference Type:
- publication
- Title:
- Degradation of aniline and chloroanilines by sunlight and microbes in estuarine water.
- Author:
- Hwang H.-M., Hodson R. E., Lee R. F.
- Year:
- 1 987
- Bibliographic source:
- Water Res. 21, 309-316
Materials and methods
- Principles of method if other than guideline:
- BUA report
- GLP compliance:
- not specified
Test material
- Reference substance name:
- 2,4-dichloroaniline
- EC Number:
- 209-057-8
- EC Name:
- 2,4-dichloroaniline
- Cas Number:
- 554-00-7
- Molecular formula:
- C6H5Cl2N
- IUPAC Name:
- 2,4-dichloroaniline
Constituent 1
Results and discussion
Any other information on results incl. tables
conclusion
Photodegradation plays a significant role as an elimination path in surface waters: Half-lives (t1/2) for the phototransformation of 2,4-dichloroaniline in natural solar radiation (latitude of 30° north) range from 26 hours in summer to 68 hours in winter.
____________________________________________________________________________________________________
Due to the UV absorption properties of 2,4-dichloroaniline, interactions of the substance with sunlight (> 290/295 nm) are expected.
Direct phototransformation is usually the dominant reaction mechanism in water while indirect phototransformation (reaction with photochemically formed radicals like OH., HO2., ROx.) is of minor importance (Lemaire et al., 1985, Mill et al., 1982). According to the results quoted below this is also true for the dichloroanilines (presumably except waters rich in carbonate). Direct phototransformation can be determined in pure water, in natural waters however both the direct and indirect phototransformation are assessed.
pKa values of the corresponding acids of dichloroanilines suggest that phototransformation in water should predominantly emanate from the disproportionate form of the molecule.
Study by Hwang et al., 1987
The quantum yield for direct photodegradation of 2,4-dichloroaniline in buffered water (pH 7.6) was 0.044, which means that 1000 light quanta transform 44 molecules of 2,4-dichloroaniline.
Furthermore, the photodegradation of 2,4-dichloroaniline in field trials was studied. From the rate constant k (first order) the half-life (t1/2 = 0.693/k) was calculated in each case (=> see tables below).
Samples were treated with formaldehyde in order to kill microorganisms and suppress the biodegradation. UV absorption by formaldehyde is negligible under the experimental conditions. The elimination of 2,4-dichloroaniline in dark controls without formaldehyde was also negligible. No biodegradation of 2,4-dichloroaniline took place during 4 hours or 3 days of incubation time under the given conditions. Water samples from estuaries that were not treated with formaldehyde, and for which also biomineralization was detected, had higher biomineralization rates than samples containing formaldehyde (no microbial activity).Authors suspect this result is based on the fact that 2,4-dichloroaniline can be decomposed only photochemically under the experimental conditions while the resulting phototransformation products can be mineralized both photochemically and microbially.
A slower photodegradation in natural water compared to that in distilled water is generally attributed to a reduction of incident UV radiation 1) due to the presence of other dissolved organic substances and suspended particles or 2) due to quenching of the excited state of the substance under study by humic molecules. The latter is suspected by the authors to occur in the case of the investigated chloroaniline.
Phototransformation (1. reaction step) - half-life t1/2
information on methodology: - 25 µg 14C-2,4-dichloroaniline / l, predissolved in acetone (acetone didn't show photosensitising effects) - midday sun, cloudless sky, about 30° north latitude - depth of water: 3 cm - test duration: 4 h - samples were mixed with formaldehyde |
||
|
t1/2 summer, 25 °C |
t1/2 winter, 13 °C |
distilled water (pH 7.7) |
10 h |
21 h |
surface water from an estuarine (pH 7.7) |
26 h |
68 h |
Photomineralization (=>14CO2) - half-life t1/2
information on methodology: - 25 µg 14C-2,4-dichloroaniline / l, predissolved in acetone (acetone didn't show photosensitising effects) - sunny days, cloudless sky, about 30° north latitude - depth of water: 3 cm - test duration: 3 d |
||
|
t1/2 summer, 25 °C |
t1/2 winter, 13 °C |
distilled water (pH 7.7) |
77 d |
98 d |
surface water from an estuarine (pH 7.7) |
84 d (49 d)* |
189 d (92 d)* |
* photomineralization plus biomineralization (samples without formaldehyde)
Applicant's summary and conclusion
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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