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EC number: 210-323-0 | CAS number: 612-83-9
- 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
Adsorption / desorption
Administrative data
- Endpoint:
- adsorption / desorption
- Type of information:
- migrated information: read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- other information
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: secondary source
Data source
Reference
- Reference Type:
- secondary source
- Title:
- BUA, Beratergremium für umweltrelevante Altstoffe; 3,3´-Dichlrorobenzidin, BUA-Stoffbericht 30, March 1989
- Year:
- 1 989
- Bibliographic source:
- Gesellschaft Deutscher Chemiker, GdCh, Beratergremium für umweltrelevante Altstoffe, BUA, VCH Verlag, Weinheim
Materials and methods
Test material
- Reference substance name:
- 3,3'-dichlorobenzidine
- EC Number:
- 202-109-0
- EC Name:
- 3,3'-dichlorobenzidine
- Cas Number:
- 91-94-1
- IUPAC Name:
- 3,3'-dichlorobiphenyl-4,4'-diamine
Constituent 1
Results and discussion
Applicant's summary and conclusion
- Executive summary:
3,3´-dichlorobenzidine (DCB) is readily adsorbed by aquatic sediments.
As was found for sand-silt sediments from ponds with an organic carbon content of 0.8 - 2.4% , the sediment-water partition coefficient Kd after 24 hours incubation at 22°C for both, destilled water or to pH 5 - 7 buffered solutions were between 20 - 40 (Kd as the ratio of sediment sorbed DCB [µg/g sediment] to dissolved DCB [µg/g water]). Lake sediments with extremely high organic carbon content showed Kd-values up to 128.
With more alkaline pH, especially at pH 9, sorption is considerably declining as desorption is increased. This is due to the liberation of humic acids and fulvo acids from the sediment. The extent of desorption is declining with prolonged contact time of sediment with DCB (24h versus 7 days). This might be so because of a transition with time of mainly phyisical adsoprtion to covalent bonds
by condensation reactions of amino groups of DCB with carbonyl groups of the organic carbon content of the sediment.
This is supported by other data showing the decrease with time of the extractability of DCB from clay-loam-soils by ethyl acetate : methanol 60 : 40 (v/v) (4 weeks: 22%, 32 weeks: 7 - 10%) and the concommitant increase of extractability with sodium hydroxide.
Immobility of DCB in soils was also demonstrated by perlocation experiments (constant water flow through DCB conatminated soil to noncontaminated soil over 12 weeks): at maximum 2.9% of the radioactively labelled DCB had been translocated to the noncontaminated soil and at maximum 0.16% had been found in the flow through water.
Adsorption of DCB to soils is following Freundlich´s equation, as had been deduced with clay-loam-soil and sand soil:
Cs = Kp * CW1/n;
Cs = amount of DCB adsorbed to soil [nmol/g];
CW = DCB in solution water [nmol/ml];
KP = Soil-watre partition coefficient;
Constant 1/n describes linearity of the adsorption isotherm;
Clay-loam (5.69% organic carbon, pH 7.7, 25°C): KP = 1113, 1/n = 0,85
Sand (2.9% organic carbon, pH 5.9, 25°C): KP = 273, 1/n = 0,74
This demonstrates the high affinity of DCB for both soils.
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