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EC number: 606-396-7 | CAS number: 198904-86-8
- 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:
- from 06 Jun 2017 to 28 Aug 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to other study
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.7 (Degradation: Abiotic Degradation: Hydrolysis as a Function of pH)
- Version / remarks:
- 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 111 (Hydrolysis as a Function of pH)
- Version / remarks:
- 2004
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 835.2120 (Hydrolysis of Parent and Degradates as a Function of pH at 25°C)
- Version / remarks:
- 2008
- Deviations:
- no
- GLP compliance:
- yes
- Radiolabelling:
- no
- Analytical monitoring:
- yes
- Details on sampling:
- TESTS CONDUCTED
Tier 1 at 50°C (pH 4, 7 and 9) and Tier 2 at 3 different temperatures (pH 4, 7 and 9)
PREPARATION OF THE SAMPLES
- Test item was spiked to the buffers using a solution of the test item in acetonitrile.
- Target concentration: 0.2 mg/L
- For each sampling time, duplicate sterile vessels under vacuum were filled with 6 mL test solution.
- The vessels were placed in a temperature controlled environment in the dark.
- Blank buffers containing a similar content of co-solvent were treated similarly as the test samples (at t=0).
SAMPLING DETAILS
- Samples for analysis were taken immediately after preparation (t=0), at t= 5 days (Tier 1) and at several sampling points after t=0 (Tier 2).
- Samples taken from solutions with a temperature > 20°C were cooled to room temperature using running tap water.
- Samples not analysed on the sampling day were stored in the freezer. Stability has been demonstrated over a period of at least 17 days. On the day of analysis, the frozen samples were defrosted at room temperature, treated and analysed.
pH MEASUREMENTS
The pH of the test solutions (except for the blanks) was determined at each sampling point. - Buffers:
- Buffer pH 4: 16.7% 0.01 M sodium acetate and 83.3% 0.01 M acetic acid in water.
Buffer pH 7: 0.01 M potassium di-hydrogenphosphate in water adjusted to pH 7 using 1 N sodium hydroxide.
Buffer pH 9: 0.01 M boric acid and 0.01 M potassium chloride in water adjusted to pH 9 using 1 N sodium hydroxide.
Details:
- Kind of water: tap water purified by a purification system (Milli-Q, Millipore)
- Sodium azide content: 0.0009% (w/v) - Details on test conditions:
- TEST SYSTEM
- Sterilisation method: Each buffer was filter-sterilised through a 0.2 µm FP 30/0.2 CA-S filter (Whatman) and transferred into a sterile vessel.
- Measures to exclude oxygen: nitrogen gas was purged through the sterile buffers for 5 minutes prior to preparation of the blank and test solutions.
- Measures taken to avoid photolytic effects: the test vessels were kept in the dark.
TEST MEDIUM
- Identity and concentration of co-solvent: acetonitrile. The volume of the co-solvent was < 1% of the sample volume. Nominal concentrations were not corrected for the spiking volume.
DETAILS TIER 1
pH 4.0, pH 7.0 and pH 9.0 at 50.0 ± 0.2°C
DETAILS TIER 2
pH 4.0 - 4.1 at 19.3 ± 0.8°C, 49.8 ± 0.1°C and 59.0 ± 0.6°C
pH 6.9 - 7.1 at 19.3 ± 0.8°C, 49.6 ± 0.4°C and 59.1 ± 0.6°C
pH 8.9- 9.0 at 19.3 ± 0.8°C, 49.6 ± 0.3°C and 59.1 ± 0.6°C
- Duration:
- 769.62 h
- pH:
- 4
- Temp.:
- 20 °C
- Initial conc. measured:
- >= 0.208 - <= 0.225 mg/L
- Remarks:
- Duplicate samples.To avoid an error in the Validation check, the' >=' and '<=' codes were used.
- Duration:
- 266.08 h
- pH:
- 4
- Temp.:
- 50 °C
- Initial conc. measured:
- >= 0.161 - <= 0.203 mg/L
- Duration:
- 75.77 h
- pH:
- 4
- Temp.:
- 60 °C
- Initial conc. measured:
- >= 0.167 - <= 0.176 mg/L
- Duration:
- 769.4 h
- pH:
- 7
- Temp.:
- 20 °C
- Initial conc. measured:
- >= 0.196 - <= 0.201 mg/L
- Duration:
- 745.93 h
- pH:
- 7
- Temp.:
- 50 °C
- Initial conc. measured:
- >= 0.187 - <= 0.187 mg/L
- Duration:
- 98.07 h
- pH:
- 7
- Temp.:
- 60 °C
- Initial conc. measured:
- >= 0.171 - <= 0.187 mg/L
- Duration:
- 768.98 h
- pH:
- 9
- Temp.:
- 20 °C
- Initial conc. measured:
- >= 0.191 - <= 0.207 mg/L
- Duration:
- 576.85 h
- pH:
- 9
- Temp.:
- 50 °C
- Initial conc. measured:
- >= 0.18 - <= 0.194 mg/L
- Duration:
- 75.02 h
- pH:
- 9
- Temp.:
- 60 °C
- Initial conc. measured:
- >= 0.175 - <= 0.186 mg/L
- Number of replicates:
- Two
- Positive controls:
- no
- Negative controls:
- no
- Preliminary study:
- At pH 4, pH 7 and pH 9, a degree of hydrolysis of > 10% was observed after 5 days at 50°C. The Tier 2 test is required.
- Test performance:
- RECOVERIES
- Recovery is the concentration analysed at t=0 relative to the nominal concentration.
- The mean (n=2) recovery at each pH and temperature was calculated (see table below).
- The mean recoveries obtained at pH 4 fell within the acceptable range for non-labelled chemicals of 70-110%.
- The mean recoveries obtained at pH 7 fand at pH 9 ell within the criterion range of 90-110%.
- The concentrations analysed in the test samples were not corrected for recovery. - Transformation products:
- not specified
- Details on hydrolysis and appearance of transformation product(s):
- no data
- % Recovery:
- 85
- pH:
- 4
- Temp.:
- 50 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 1
- % Recovery:
- 78
- pH:
- 7
- Temp.:
- 50 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 1
- % Recovery:
- 86
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 1
- % Recovery:
- > 100
- pH:
- 4
- Temp.:
- 20 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 2 (108%)
- % Recovery:
- 91
- pH:
- 4
- Temp.:
- 50 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 2
- % Recovery:
- 86
- pH:
- 4
- Temp.:
- 60 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 2
- % Recovery:
- 99
- pH:
- 7
- Temp.:
- 20 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 2
- % Recovery:
- 93
- pH:
- 7
- Temp.:
- 50 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 2
- % Recovery:
- 90
- pH:
- 7
- Temp.:
- 60 °C
- Duration:
- 0 d
- Remarks on result:
- other: Tier 2
- % Recovery:
- 99
- pH:
- 9
- Temp.:
- 20 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 2
- % Recovery:
- 94
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 2
- % Recovery:
- 90
- pH:
- 9
- Temp.:
- 60 °C
- Duration:
- 0 h
- Remarks on result:
- other: Tier 2
- pH:
- 4
- Temp.:
- 20 °C
- Hydrolysis rate constant:
- 0 h-1
- DT50:
- 1 601 h
- Type:
- (pseudo-)first order (= half-life)
- Key result
- pH:
- 4
- Temp.:
- 25 °C
- Hydrolysis rate constant:
- 0.001 h-1
- DT50:
- 902 h
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: from the Arrhenius equation
- pH:
- 4
- Temp.:
- 50 °C
- Hydrolysis rate constant:
- 0.01 h-1
- DT50:
- 66 h
- Type:
- (pseudo-)first order (= half-life)
- pH:
- 4
- Temp.:
- 60 °C
- Hydrolysis rate constant:
- 0.039 h-1
- DT50:
- 18 h
- Type:
- (pseudo-)first order (= half-life)
- pH:
- 7
- Temp.:
- 20 °C
- Hydrolysis rate constant:
- 0.002 h-1
- DT50:
- 382 h
- Type:
- (pseudo-)first order (= half-life)
- Key result
- pH:
- 7
- Temp.:
- 25 °C
- Hydrolysis rate constant:
- 0.002 h-1
- DT50:
- 313 h
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: from the Arrhenius equation
- pH:
- 7
- Temp.:
- 50 °C
- Hydrolysis rate constant:
- 0.006 h-1
- DT50:
- 124 h
- Type:
- (pseudo-)first order (= half-life)
- pH:
- 7
- Temp.:
- 60 °C
- Hydrolysis rate constant:
- 0.028 h-1
- DT50:
- 25 h
- Type:
- (pseudo-)first order (= half-life)
- pH:
- 9
- Temp.:
- 20 °C
- Hydrolysis rate constant:
- 0.002 h-1
- DT50:
- 365 h
- Type:
- (pseudo-)first order (= half-life)
- Key result
- pH:
- 9
- Temp.:
- 25 °C
- Hydrolysis rate constant:
- 0.002 h-1
- DT50:
- 308 h
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: from the Arrhenius equation
- pH:
- 9
- Temp.:
- 50 °C
- Hydrolysis rate constant:
- 0.005 h-1
- DT50:
- 140 h
- Type:
- (pseudo-)first order (= half-life)
- pH:
- 9
- Temp.:
- 60 °C
- Hydrolysis rate constant:
- 0.033 h-1
- DT50:
- 21 h
- Type:
- (pseudo-)first order (= half-life)
- Validity criteria fulfilled:
- yes
- Conclusions:
- The half-life time of the substance at 25°C at pH 4, pH 7 and pH 9 was determined to be 902 hours, 313 hours and 308 hours, respectively.
- Executive summary:
The rate of hydrolysis of the substance at pH values normally found in the environment (pH 4, 7 and 9) was determined in a GLP-compliant study according to EC C.7, OECD 111 and EPA OPPTS 835.2120.
A degree of hydrolysis of > 10% was determined at pH 4, pH 7 and pH 9 after 5 days and 50°C (Tier 1).
Hydrolysis rates at 20°C, 50°C and 60°C were determined in a Tier 2 study. The substance was shown to degrade by a pseudo-first order behaviour. Half-life times at 25°C were determined from the Arrhenius equation: 902 hours, 313 hours and 308 hours at pH 4, pH 7 and pH 9, resp.
Reference
pH 4: Statistical Parameters Pseudo-first order curve
Temperature |
Slope |
Intercept |
Coefficient of correlation |
20 |
-1.88E-04 |
2.00 |
0.852 |
50 |
-4.53E-03 |
1.98 |
0.996 |
60 |
-1.69E-02 |
1.91 |
0.986 |
pH 7: Statistical Parameters Pseudo-first order curve
Temperature |
Slope |
Intercept |
Coefficient of correlation |
20 |
-7.88E-04 |
1.90 |
0.828 |
50 |
-2.44E-03 |
1.91 |
0.936 |
60 |
-1.20E-02 |
1.82 |
0.967 |
pH 9: Statistical Parameters Pseudo-first order curve
Temperature |
Slope |
Intercept |
Coefficient of correlation |
20 |
-8.24E-04 |
1.99 |
0.946 |
50 |
-2.14E-03 |
1.86 |
0.985 |
60 |
-1.42E-02 |
1.89 |
0.983 |
Description of key information
The rate of hydrolysis of the substance at pH values normally found in the environment (pH 4, 7 and 9) was determined in a GLP-compliant study according to EC C.7, OECD 111 and EPA OPPTS 835.2120.
A degree of hydrolysis of > 10% was determined at pH 4, pH 7 and pH 9 after 5 days and 50°C (Tier 1).
Hydrolysis rates at 20°C, 50°C and 60°C were determined in a Tier 2 study. The substance was shown to degrade by a pseudo-first order behaviour. Half-life times at 25°C were determined from the Arrhenius equation: 902 hours, 313 hours and 308 hours at pH 4, pH 7 and pH 9, resp.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 313 h
- at the temperature of:
- 25 °C
Additional information
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.