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EC number: 229-657-3 | CAS number: 6641-64-1
- 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
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_environmental-fate-and-pathways.png)
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: screening tests
- Type of information:
- (Q)SAR
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
- Justification for type of information:
- The supporting QMRF report has been attached.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))
- Principles of method if other than guideline:
- Prediction was done using OECD QSAR tool box v.3.3
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- Name ( IUPAC):4,5-Dichloro-2-nitroaniline
Molecular formula:C6H4Cl2N2O2
Molecular weight: 207.016 g/mol
Smilies:Nc1cc(Cl)c(Cl)cc1[N+]([O-])=O
Inchi:1S/C6H4Cl2N2O2/c7-3-1-5(9)6(10(11)12)2-4(3)8/h1-2H,9H2
Substance type: Organic - Oxygen conditions:
- aerobic
- Inoculum or test system:
- other: Microorganisms
- Duration of test (contact time):
- 28 d
- Parameter followed for biodegradation estimation:
- other: BOD
- Key result
- Parameter:
- other: % degradation by BOD
- Value:
- 0.444
- Sampling time:
- 28 d
- Remarks on result:
- other: other details not available
- Details on results:
- The test chemical 4,5-Dichloro-2-nitroaniline showed 0.44 % biodegradation by using BOD parameter in 28 days.
- Validity criteria fulfilled:
- not specified
- Interpretation of results:
- not readily biodegradable
- Conclusions:
- The test chemical 4,5-Dichloro-2-nitroaniline showed 0.44 % biodegradation by using BOD parameter and microorganisms as inoculum in 28 days. By this value of percent biodegradation it is concluded that test chemical 4,5-Dichloro-2-nitroaniline is not readily biodegradable.
- Executive summary:
Biodegradability of test chemical 4,5-Dichloro-2-nitroaniline is predicted using OECD QSAR tool box v.3.3 using log Kow as preimary descriptor. The test chemical 4,5-Dichloro-2-nitroaniline showed 0.44 % biodegradation by using BOD parameter and microorganisms as inoculum in 28 days. By this value of percent biodegradation it is concluded that test chemical 4,5-Dichloro-2-nitroaniline is not readily biodegradable.
Reference
The
prediction was based on dataset comprised from the following
descriptors: BOD
Estimation method: Takes average value from the 6 nearest neighbours
Domain logical expression:Result: In Domain
(((((((("a"
or "b" or "c" or "d" or "e" or "f" )
and "g" )
and "h" )
and "i" )
and "j" )
and "k" )
and ("l"
and (
not "m")
)
)
and ("n"
and "o" )
)
Domain
logical expression index: "a"
Referential
boundary: The
target chemical should be classified as Anilines (Acute toxicity) by
US-EPA New Chemical Categories
Domain
logical expression index: "b"
Referential
boundary: The
target chemical should be classified as Strong binder, NH2 group by
Estrogen Receptor Binding
Domain
logical expression index: "c"
Referential
boundary: The
target chemical should be classified as SNAr OR SNAr >> Nucleophilic
aromatic substitution OR SNAr >> Nucleophilic aromatic substitution >>
Activated halo-benzenes by Protein binding by OECD ONLY
Domain
logical expression index: "d"
Referential
boundary: The
target chemical should be classified as SNAr OR SNAr >> Nucleophilic
aromatic substitution on activated aryl and heteroaryl compounds OR SNAr
>> Nucleophilic aromatic substitution on activated aryl and heteroaryl
compounds >> Activated aryl and heteroaryl compounds by Protein binding
by OASIS v1.3 ONLY
Domain
logical expression index: "e"
Referential
boundary: The
target chemical should be classified as Radical OR Radical >> Radical
mechanism via ROS formation (indirect) OR Radical >> Radical mechanism
via ROS formation (indirect) >> Nitroaniline Derivatives OR Radical >>
Radical mechanism via ROS formation (indirect) >> Nitroarenes with Other
Active Groups OR SN1 OR SN1 >> Nucleophilic attack after diazonium or
carbenium ion formation OR SN1 >> Nucleophilic attack after diazonium or
carbenium ion formation >> Nitroarenes with Other Active Groups OR SN1
>> Nucleophilic attack after reduction and nitrenium ion formation OR
SN1 >> Nucleophilic attack after reduction and nitrenium ion formation
>> Nitroaniline Derivatives OR SN1 >> Nucleophilic attack after
reduction and nitrenium ion formation >> Nitroarenes with Other Active
Groups OR SN2 OR SN2 >> SN2 attack on activated carbon Csp3 or Csp2 OR
SN2 >> SN2 attack on activated carbon Csp3 or Csp2 >> Nitroarenes with
Other Active Groups by DNA binding by OASIS v.1.3 ONLY
Domain
logical expression index: "f"
Referential
boundary: The
target chemical should be classified as SN1 OR SN1 >> Nitrenium Ion
formation OR SN1 >> Nitrenium Ion formation >> Aromatic nitro OR SN1 >>
Nitrenium Ion formation >> Primary aromatic amine by DNA binding by OECD
ONLY
Domain
logical expression index: "g"
Referential
boundary: The
target chemical should be classified as days - weeks by Biodeg primary
(Biowin 4) ONLY
Domain
logical expression index: "h"
Referential
boundary: The
target chemical should be classified as Does NOT Biodegrade Fast by
Biodeg probability (Biowin 1) ONLY
Domain
logical expression index: "i"
Referential
boundary: The
target chemical should be classified as Does NOT Biodegrade Fast by
Biodeg probability (Biowin 2) ONLY
Domain
logical expression index: "j"
Referential
boundary: The
target chemical should be classified as Class 3 (unspecific reactivity)
by Acute aquatic toxicity classification by Verhaar (Modified) ONLY
Domain
logical expression index: "k"
Referential
boundary: The
target chemical should be classified as Phenols and Anilines by Acute
aquatic toxicity MOA by OASIS ONLY
Domain
logical expression index: "l"
Referential
boundary: The
target chemical should be classified as Known precedent reproductive and
developmental toxic potential AND NO2-alkyl/NO2-benzene derivatives (8b)
AND Polyhalogenated benzene derivatives (8c) by DART scheme v.1.0
Domain
logical expression index: "m"
Referential
boundary: The
target chemical should be classified as Dihalogen-, dinitro-phenol and
their ester derivatives (8e) OR Not known precedent reproductive and
developmental toxic potential by DART scheme v.1.0
Domain
logical expression index: "n"
Parametric
boundary:The
target chemical should have a value of Molecular weight which is >= 138
Da
Domain
logical expression index: "o"
Parametric
boundary:The
target chemical should have a value of Molecular weight which is <= 218
Da
Description of key information
Biodegradability of test chemical 4,5-Dichloro-2-nitroaniline is predicted using OECD QSAR tool box v.3.3 using log Kow as preimary descriptor. The test chemical 4,5-Dichloro-2-nitroaniline showed 0.44 % biodegradation by using BOD parameter and microorganisms as inoculum in 28 days. By this value of percent biodegradation it is concluded that test chemical 4,5-Dichloro-2-nitroaniline is not readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
Predicted data for the target compound 4,5-Dichloro-2-nitroaniline (CAS no. 6641-64-1) and supporting weight of evidence studies for its read across substance were reviewed for the biodegradation end point which are summarized as below
In a prediction biodegradability of test chemical 4,5-Dichloro-2-nitroaniline is estimated using OECD QSAR tool box v.3.3 using log Kow as primary descriptor. The test chemical 4,5-Dichloro-2-nitroaniline showed 0.44 % biodegradation by using BOD parameter and microorganisms as inoculum in 28 days. By this value of percent biodegradation it is concluded that test chemical 4,5-Dichloro-2-nitroaniline is not readily biodegradable.
Another prediction done by using Estimation Programs Interface Suite (EPI suite, 2017) to estimate the biodegradation potential of the test chemical 4,5-Dichloro-2-nitroaniline (CAS No: 6641-64-1) in the presence of mixed populations of environmental microorganisms. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that chemical 4,5-Dichloro-2-nitroaniline is not readily biodegradable.
In a supporting weight of evidence study from authoritative database (J Check, 2017) the read across chemical 4-Chlor-2-nitroanilin (CAS no. 89-63-4) was subjected to biodegradation test by taking sludge as inoculums at 30 mg/L concentration. Biodegradation was analyzed by using three parameters that are BOD, TOC and GC. The initial concentration of read across chemical was 100 mg/L and study design is of standard type. After 2 weeks read across chemical showed 0 % degradation by all three parameters BOD, TOC and GC so it is concluded that read across chemical 4-Chlor-2-nitroanilin is not readily biodegradable.
In another supporting weight of evidence study from authoritative database (J Check, 2017) read across chemical 1,2-Dichloro-4-nitrobenzene (CAS no. 99-54-7) was subjected to biodegradation test by taking sludge as inoculums at 30 mg/L concentration. Biodegradation was analyzed by using three parameters that are BOD, TOC and GC. The initial concentration of read across chemical was 100 mg/L and study design is of standard type. After 4 weeks (28 days) read across chemical1,2-Dichloro-4-nitrobenzene showed 0.0 % degradation by BOD and TOC parameter and 7 % degradation by GC parameter in 28 days so it is concluded that read across chemical1,2-Dichloro-4-nitrobenzene is not readily biodegradable.
On the basis of above results for target chemical 4,5-Dichloro-2-nitroaniline (CAS no. 6641-64-1) (from OECD QSAR tool box v3.4 and EPI suite, 2017) and for its read across substance (from authoritative database), it is concluded that the test substance 4,5-Dichloro-2-nitroaniline is not readily biodegradable in nature.
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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