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EC number: 220-491-7 | CAS number: 2783-94-0
- 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
Endpoint summary
Administrative data
Description of key information
Additional information
Stability:-
Phototransformation in air:
The atmospheric oxidation half-life of disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate was estimated using the level III multimedia model. It was estimated that the substance is persistent in air medium as the half life period of disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate in air is 4 days. This indicates that disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate is not likely to photo transformed in air.
OVERALL OH Rate Constant =0.000000000004cm3/molecule-sec.
Hydrolysis:
The Hydrolysis rate constant of disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate is estimated to be 0.0000000000040204 (4.0204 E-12) cm3/molecule-sec. at half life of the 31.925 Hrs.The estimated half life of the substance indicates that the substance is slowly hydrolysable.
Phototransformation in water :
No experimental data available. As this study is not a standard information requirement in REACH and there is no indication from the CSA on the need to investigate further the fate and behaviour of the substance (Annex X requirement), no further testing is considered necessary.
Phototransformation in Soil :
No experimental data available. As this study is not a standard information requirement in REACH and there is no indication from the CSA on the need to investigate further the fate and behaviour of the substance (Annex X requirement), no further testing is considered necessary.
Biodegradation:
Biodegradation in water: screening tests:
The half life period of disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate in water is 38 days and based on this value it can be concluded that the chemical is not persistent in water medium since the half life is less than the threshold of 60 days (to qualify the chemical as persistent). Also the diffusion percentage of disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate in water medium is 9 %. This coupled with the dilution of water shall result in ready biodegradability of the chemical.
Medium |
Half life in Days |
Percent in medium |
Water |
38 |
9% |
Biodegradation in water and sediment: simulation tests:
Based on the Level III Fugacity Model, the half life period of the disodium 6-hydroxy-5-[(4-sulphonatophenyl) azo] naphthalene-2-sulphonate was estimated. The half period of disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate in water is 38 days (912 hrs) therefore it is considered that the substance will qualify as not persistent as the half life does not exceed the EPA criteria of 60 days. So, it can be confirmed that the substance is readily biodegradable in water medium where as in sediment the half life is 340 days (8160 hrs).
Based on this value, it can be inferred that the substance is persistent in sediment medium and is not readily biodegradable probably due to the anaerobic conditions existing in most sediments. However, it can be observed that disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate less diffuse in the sediment medium since it's percentage in the sediment medium is reported to be 13% and hence persistence in the sediment compartment is not likely to be critical.
PBT profiler estimation:
Medium |
Half life in Days |
Percent in medium |
Water |
38 |
9% |
Sediment |
340 |
13% |
Biodegradation in soil:
The PBT Profiler & EPI Suite has estimated that disodium 6-hydroxy-5-[(4-sulphonatophenyl) azo]naphthalene-2-sulphonate is expected to be found predominantly in soil and its persistence estimate is based on its transformation in this medium. Its half-life in soil, 75 days (1800 hrs). Does not exceed the threshold of 120 days as per Annex XIII of REACH. Thereforedisodium 6-hydroxy-5-[(4-sulphonatophenyl) azo]naphthalene-2-sulphonateis estimated to be not persistent in the soil environment.
PBT Profiler Estimate:
Media |
Half-Life (days) |
Percent in |
Soil |
75 |
78% |
Fugacity Model by EPI Suite estimation database:
|
Mass Amount (percent) |
Half-Life (days) |
Emissions (kg/hr) |
Soil |
77.9 |
1.8e+003 |
1000 |
Bioaccumulation:
Bioaccumulation is the process by which the chemical concentration in an aquatic organism achieves a level that exceeds that in the water, as a result of chemical uptake through all possible routes of exposure. The relationship between bioaccumulation and bio-concentration is that, chemicals that have the potential to bioconcentrate also have the potential to bioaccumulate. Bioaccumulation is closely related to the Bioconcentration factor (BCF).
The estimated BCF of the key study was obtained to be 3.2.Supporting study also indicate the BCF value to be 3.1 and 3.09.This low value of BCF of disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate indicates its non bioaccumulative nature as the BCF factor is less than the bio-concentration threshold of 2000.
Adsorption / desorption:
According to EPI (Estimation Programs Interface) Suite soil adsorption coefficient (Koc) value for disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate was estimated to be 25110 at 25°C by MCI method. This value indicates that disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate is non mobile in soil. This value is equivalent to 20088 at 20°C.
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