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Diss Factsheets
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EC number: - | CAS number: 42355-78-2
- 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
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Under test conditions no biodegradation observed.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
No ready biodegradation was tested on the substance, but according to the estimation modelling BIOWIN v.4.10, the substance is predicted as non biodegradable; all substances of the Stilbene Fluorescent Whitening Agents category are predicted as non readily biodegradable and for many members of the category readily and inherently biodegradability tests have been performed confirming the previsions (see the Category Justification Report attached to the section 13).
The studies performed on OB 3a-MSA, the analogue dihydroxyethylamino derivative tetrasulphonated, are reported here as the main reference. Both the substance under registration OB 1 -MSA and the analogue OB 3a-MSA are tetrasulphonated sodium salts. The diethylamino substituent is less polar, less reactive and makes the molecule slightly less soluble compared to the dihydroxyethylamino derivative. The latter can therefore considered as a representative conservative analogous for the biodegradability endpoint.
In a ready biodegradability test according to OECD guideline 301A (Ciba-Geigy, 1992) a DOC removal of 1.2 % was observed. Hence, the substance OB 3a-MSA is considered not readily biodegradable. Three BOD5 tests, in which no oxygen consumption was measured, confirm the non rapid biodegradability of the test substance. Additional information is given from two Zahn Wellens tests OECD 302B (Ciba-Geigy, 1992 and Novartis Services AG., 1997). One of the two indicates a biodegradation of 24 % after 28 days. This value is obtained at about the fifth day; afterwards the degradation process seems to stop. The slope of the 28 days curve, the second test of inherent biodegradation and the BOD5/COD reported suggest that the 24 % of DOC removal recorded in the first Zahn Wellens test can still be related to a slow adsorption process more than a biological degradation.
In conclusion, the substance can be considered as neither readily nor inherently biodegradable.
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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