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reaction mass of: tetrasodium 4-amino-6-(5-(2,6-difluoropyrimidin-4-ylamino)-2-sulfonatophenylazo)-5-hydroxy-3-(4-(sulfatoethylsulfonyl)phenylazo)naphthalene-2,7-disulfonate;tetrasodium 4-amino-6-(5-(4,6-difluoropyrimidin-2-ylamino)-2-sulfonatophenylazo)-5-hydroxy-3-(4-(2-sulfatoethylsulfonyl)phenylazo)naphthalene-2,7-disulfonate
EC number: 431-830-5 | CAS number: -
- 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)
- Endpoint:
- hydrolysis
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1998-04-21 to 1998-05-22
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.7 (Degradation: Abiotic Degradation: Hydrolysis as a Function of pH)
- GLP compliance:
- yes (incl. QA statement)
- Radiolabelling:
- no
- Analytical monitoring:
- yes
- Buffers:
- pH 4: 21.008 g citric acid dissolved in 200 ml sodium hydroxide solution (1 mol/l) and filled up to 1 l.
pH 7: 13.61 g potassium dihydrogen phosphate was dissolved in 1L water; 29.63 ml of sodium hydroxide (1 mol/L) were added to 500 ml of this solution and filled up to a volume of 1 L with distilled water. The solution was adjusted to pH 7.0 with sodium hydroxide or hydrochloric acid.
pH 9: 7.46 g of potassium chloride and 6.184 g of boric acid were dissolved in 1 L water; 500 ml of this solution were added to 21.3 ml sodium hydroxide (1 mol/L) and filled up to a volume of 1 L with water. The solution was adjusted to pH 9.0 with sodium hydroxide or hydrochloric acid. - Details on test conditions:
- Pre-test
- pH 4, 7, 9 at 50°C
Main Test
-Test 1 - pH7 at 50 °C
-Test 2 - pH7 at 55°C
-Test 4 - pH 7 at 65 °C - Duration:
- 4.5 h
- pH:
- 7
- Temp.:
- 50
- Initial conc. measured:
- >= 184.16 - <= 193.76 mg/L
- Duration:
- 3.1 h
- pH:
- 7
- Temp.:
- 55
- Initial conc. measured:
- >= 173.08 - <= 192.68 mg/L
- Duration:
- 1.6 h
- pH:
- 7
- Temp.:
- 65
- Initial conc. measured:
- >= 191.64 - < 195.12 mg/L
- Number of replicates:
- Number of replicates in pre-test - 2 per treatment
Number of replicates in main test - 1 per treatment - Positive controls:
- not specified
- Negative controls:
- not specified
- Preliminary study:
- The preliminary study indicated the following:
- Decomposition at pH 9 is higher than 50 % after 2.4 hours at 50 °C, indicating the test substance is hydrolytically unstable at pH 9
- Decomposition at pH 4 is less than 10 % after 5 days at 50 °C, indicating the test substance is hydrolytically stable at pH 4
- The pre-test at pH 7 indicated that examination of the hydolysis kinetics is essential - Transformation products:
- not measured
- Details on hydrolysis and appearance of transformation product(s):
- Transformation products were not measured.
- pH:
- 4
- Temp.:
- 25 °C
- DT50:
- > 1 yr
- Remarks on result:
- other: Conclusion from preliminary test.
- pH:
- 7
- Temp.:
- 65 °C
- Hydrolysis rate constant:
- ca. 0.923 h-1
- DT50:
- ca. 0.75 h
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: r = 0.9998
- pH:
- 7
- Temp.:
- 55 °C
- Hydrolysis rate constant:
- ca. 0.354 h-1
- DT50:
- ca. 1.96 h
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: r = 1.0
- pH:
- 7
- Temp.:
- 50 °C
- Hydrolysis rate constant:
- ca. 0.202 h-1
- DT50:
- ca. 3.44 h
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: r = 0.996
- pH:
- 7
- Temp.:
- 25 °C
- DT50:
- 59 h
- Remarks on result:
- other: Extrapolation using the Arrhenius equation
- pH:
- 9
- Temp.:
- 25 °C
- DT50:
- < 24 h
- Remarks on result:
- other: Conclusion from preliminary test.
- Validity criteria fulfilled:
- yes
- Conclusions:
- A study was performed to determine abiotic degradation due to hydrolysis as a function of pH of the test substance Reactive Navy FC63805. The study was performed according the EU method C.7 and in compliance with GLP. At pH 4 the decomposition was less than 10 % after 5 days at 50 °C. At pH 7 a half-life of 2.46 days at 25 °C was extrapolated from higher test temperatures. At pH 9 the half-life is < 2.4 hours at 50 °C.
Accordingly, the substance can be considered as hydrolytically stable under acidic (pH 4), moderately degradable at neutral (pH 7), and unstable in basic conditions (pH 9). - Executive summary:
Hydrolysis of the test material was studied in a pre-test and a main test. The experiments were carried out at concentrations of 175 to 200 mg/L in the dark at 50 °C in sterile aqueous buffered solutions at pH 4, 7 and 9 for 5 days in the pre-test and at pH7, at 50, 55 and 65 °C in the main test.
The experiment was conducted in accordance with EU Method C.7 and in compliance with GLP. In the main test the samples were analysed at up to 4.5 hours using HPLC analysis.
The pre-test revealed a pH-dependent decomposition of the substance. At pH 4 after 5 days only 6.4–7.5 % of the substance was decomposed, while at pH 7 and 9 after 5 days almost 100 % of the substance was degraded.
The results of the pre-test triggered more detailed examination of the hydrolysis kinetics. In the main test at pH 7 the half-life period at 25 °C was determined by extrapolating from the results of the experiments at 50, 55 and 65 °C.
The half-lives (DT50, 50% decline times) of the test material at 25 °C was calculated to be > 1 year, 2.46 days and < 1 day at pH 4, 7 and 9 respectively.
This study is classified acceptable and satisfies the guideline requirement for a hydrolysis study.
Reference
Results of pre-test:
pH |
Duration |
Decomposition [%] |
4 |
2.4 h |
0.7 |
4 |
2.4 h |
5.5 |
4 |
5 d |
7.5 |
4 |
5 d |
6.4 |
7 |
2.4 h |
33.5 |
7 |
2.4 h |
35.0 |
7 |
5 d |
99.5 |
7 |
5 d |
99.5 |
9 |
2.4 h |
98.1 |
9 |
2.4 h |
98.1 |
9 |
5 d |
99.5 |
9 |
5 d |
99.6 |
Description of key information
In a hydrolysis study performed according to EU method C.7 and in compliance with GLP Reactive Navy FC63805 showed variable hydrolytical stability with varying pH:
At pH 7 the half-life period was determined to be 2.46 days by extrapolating the results of the experiments at 25, 50, 55 and 65°C. At pH 4 the substance is considered to be hydrolytically stable (half-life > 1 year). At pH 9 the decomposition was higher than 50 % after 2.4 hours at 50°C. The test substance can be considered as hydrolytically unstable at pH 9.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 59 h
- at the temperature of:
- 25 °C
Additional information
A study was performed to determine the abiotic degradation of the test substance Reactive Navy FC63805. The study was performed according to EU method C.7 and in compliance with GLP.
Two tests were performed, a pre- and a main test. The pre-test revealed a pH-dependent decomposition of the substance. At pH 4 after 5 d only 6.4–7.5 % of the substance was decomposed while at pH 7 and 9 after 5 days almost 100 % of the substance was degraded. The pre-test at pH 7 triggered more detailed examination of the hydrolysis kinetics. At pH 4 the decomposition was < 10 % after 5 days of hydrolysis at 50 °C. At pH 7 the half-life period at 25 °C was determined by extrapolating the results of the experiments at 50, 55 and 65 °C. The DT50 (25 °C) was found to be 59 h. At pH 9 the decomposition was higher than 50 % after 2.4 hours at 50 °C, allowing the conclusion that the substance is hydrolytically unstable at this pH.
The test substance can be considered as hydrolytically unstable at pH 9. The substance can be considered as hydrolytically stable at acidic pH 4. At pH 7 at 25 °C the half-life of the substance was determined to be 59 hours.
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