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EC number: 429-600-4 | CAS number: 1026988-42-0
- 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
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
In contact with water the substance will not hydrolyse at pH=4 and will hydrolyze rapidly at pH=7 and 9.
Key value for chemical safety assessment
Additional information
In water Basazol Yellow 8511-MS dissociates into i) two molecules methane sulfonate (CAS 75-75-2) and ii) one molecule 2,4-bis[2,2'-[2-(N,N-dimethylamino)ethyloxycarbonyl]phenylazo]-1,3-dihydroxybenzene.
Methane sulfonate is an NLFG (no labile functional group) compound and hence not susceptible to hydrolysis (Kollig et al., 1993).
The two key studies were conducted with the structurally related substance Basazol Yellow 8511 (CAS 118208-02-9) which is the the analogue chloride salt.
At pH=4 and 50 °C less than 10 % hydrolysis occurred which means: t0.5 > 1y at 25 °C. Therefore no further hydrolysis tests at pH=4 were necessary according to OECD111.
At pH=7 and 25 °C t0.5 was already clearly below 24 h. Therefore a precise determination of t0.5 was not necessary according to directive 67/548/EWG.
The hydrolysis rates of aromatic esters generally increase with increasing pH (Mabey & Mill, 1978). At pH=9 and 25 °C t0.5 has to be even lower than at pH=7. Therefore a precise determination of t0.5 was not necessary.
Apart from the two esterbonds which are susceptible to hydrolysis at pH 7 and 9 (see above) the molecule does not contain hydrolysable functional groups. Hence the two hydrolysis products which were formed are: i) the aromatic diazo core with two carboxylic groups, ii) 2-dimethylaminoethanol (CAS 108-01-0).
The aromatic diazo core is not susceptible to further hydrolysis. 2-dimethylaminoethanol (CAS 108-01-0) is stable against hydrolysis (Harris, 1990; Kollig et al., 1993; Wolfe & Jeffers, 2000).
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