Registration Dossier
Registration Dossier
Data platform availability banner - registered substances factsheets
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Diss Factsheets
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 264-036-0 | CAS number: 63225-53-6
- 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:
- Tier 1: 20 - 25 Apr 2015, Tier 2: 20 Jul - 24 Sep 2015
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 111 (Hydrolysis as a Function of pH)
- Version / remarks:
- 13 Apr 2004
- Deviations:
- yes
- Remarks:
- (1) Tier 2 study: An 8 h temperature deviation (< 24 °C) occurred on the 2nd sampling day. (2) Tier 2 study: Hydrolysis was investigated at one temperature only (25 °C) instead of the minimum of three temperatures (per pH value) required by the guideline.
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.7 (Degradation: Abiotic Degradation: Hydrolysis as a Function of pH)
- Version / remarks:
- 30 May 2008
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Federal Office for the Environment (FOEN), Bern, Switzerland
- Radiolabelling:
- no
- Analytical monitoring:
- yes
- Details on sampling:
- - Sampling intervals for the parent/transformation products: Tier 1: daily, during 5 d. Tier 2: 10 - 12 sampling time points over a period of 30 d.
- Sampling method: Sampling was performed in sterile conditions (Bunsen burner, hood). For sampling, the test vessels were removed from the thermostat cabinet and 5 mL were transferred with a sterile pipette tip into a test tube. Then, sterile filtered N2 was injected into the headspace and the test vessel was immediatley closed with the screw cap and placed back onto the stirring device in the thermostat cabinet.
- Sampling intervals/times for pH measurements: At every sampling. The pH (precision ± 0.1 unit) was measured in the test tube with the remaining sample volume (after removal of volume required for HPLC).
- Sampling intervals/times for sterility check: In the Tier 1 study no sterility test was conducted at the end of the incubation period. In the Tier 2 study sterility tests were conducted at the end of the test on the pooled replicate test vessels to confirm that the degradation of the test item did not occur through biological processes. The number of colony forming units per mL (CFU/mL) was determined in the pooled replicate test vessels according to European Pharmacopoeia. The sterility tests were performed by a third laboratory in accordance with ISO/IEC 17025.
- Sample storage conditions before analysis: Either immediate HPLC measurement (with max. half (2.5 mL) of the sampled volume) or storage in freezer. In the Tier 1 study samples wer not frozen before HPLC analysis. In the Tier 2 study part of the HPLC analyses were not conducted directly after sampling. Instead, the samples were frozen in order to measure several sampling time points at once, whenever possible. To ensure the stability of the test item in the freezer, a test was performed. - Buffers:
- - pH: 4, 7, and 9
- Type and final molarity of buffer: (a) pH 4: mixture of 0.1 M potassium biphthalate and 0.1 N NaOH. (b) pH 7: mixture of 0.1 M monopotassium phosphate and 0.1 N NaOH. (c) pH 9: mixture of 0.1 M H3BO3 in 0.1 M KCl and 0.1 N NaOH.
- Composition of buffer: pH 4: 0.4 mL 0.1 N NaOH + 50 mL 0.1 M potassium biphtalate to 100 mL Milli-Q water. pH 7: 29.63 mL 0.1 N NaOH + 50 mL 0.1 M monopotassium phosphate to 100 mL MQ. pH 9: 21.30 mL 0.1 N NaOH + 50 mL 0.1 M H3BO3 to 100 mL MQ. Prepared according to Annex 3 of the guideline for a temperature of 20 °C. - Details on test conditions:
- TEST SYSTEM
- Type, material and volume of test flasks, other equipment used: 100 mL vessels with screw cap (Schott, Duran). The buffers were prepared in separate, larger glass vessels.
- Sterilisation method: Test solutions were filter-sterilized. The test and blank vessels (inlcuding a magnetic rod for stirring) were sterilized by autoclaving before use. Sampling was conducted under sterile conditions (Bunsen burner, hood) to ensure the sterility of the test vessels throughout the test.
- Lighting: None. The test vessels were placed in the thermostat cabinet in the dark.
- Measures to exclude oxygen: In the Tier 1 study the three freshly prepared buffers were sparged with N2 for about 5 min to minimize reaction of the test item with oxygen and then placed at 25 °C for at least 3 h to allow for temperature equilibration. In the Tier 2 study, the freshly prepared pH buffers were not sparged with nitrogen for 5 min. However, no influence on the initial test item concentrations were observed, which were about 50 mg/L as planned. After sampling sterilie filtered N2 was injected into the headspace before recapping the test vessels.
- If no traps were used, is the test system closed/open: Closed, with screw caps.
TEST MEDIUM
- Volume used/treatment: 50 mL
- Kind and purity of water: Milli-Q
- Preparation of test medium: The freshly prepared buffers were used to prepared test solutions of 50 mg/L test item. After stirring at least 10 min to ensure full dissolution of the test item in the thermostat cabinet at 25 °C, the pH was adjusted with a precision of ± 0.1 pH unit. The vessels were again taken out the the cabinet and were filter-sterilized under sterile conditions and then filled into the test and blank vessels.
- Renewal of test solution: No
OTHER TEST CONDITIONS
- Adjustment of pH: Yes, with a precision of ± 0.1 pH unit. - Duration:
- 5 d
- pH:
- 4
- Temp.:
- 50 °C
- Initial conc. measured:
- 50.6 mg/L
- Remarks:
- Tier 1 study
- Duration:
- 5 d
- pH:
- 7
- Temp.:
- 50 °C
- Initial conc. measured:
- 47.7 mg/L
- Remarks:
- Tier 1 study
- Duration:
- 5 d
- pH:
- 9
- Temp.:
- 50 °C
- Initial conc. measured:
- 48.2 mg/L
- Remarks:
- Tier 1 study
- Duration:
- 30 d
- pH:
- 4
- Temp.:
- 25 °C
- Initial conc. measured:
- 47.7 mg/L
- Remarks:
- Tier 2 study
- Duration:
- 30 d
- pH:
- 7
- Temp.:
- 25 °C
- Initial conc. measured:
- 48.2 mg/L
- Remarks:
- Tier 2 study
- Duration:
- 30 d
- pH:
- 9
- Temp.:
- 25 °C
- Initial conc. measured:
- 46.7 mg/L
- Remarks:
- Tier 2 study
- Number of replicates:
- 2 test vessels (buffer + test item) and 1 blank vessel (buffer without test item) per pH value
- Positive controls:
- no
- Negative controls:
- no
- Statistical methods:
- The 95% confidence intervals (CI) of the hydrolysis rate constant were calculated using the "Regression" module of the "Data Analysis" Tool of Excel, Microsoft Office 10.
- Transformation products:
- no
- Key result
- pH:
- 4
- Temp.:
- 25 °C
- Hydrolysis rate constant:
- 0.002 d-1
- DT50:
- 313 d
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: Hydrolysis rate constant: Lower CI: 0.00182 d^-1, Upper CI: 0.00262 d^-1
- Remarks:
- Half-Life: Lower CI: 265 d, Upper CI: 381 d
- Key result
- pH:
- 7
- Temp.:
- 25 °C
- Hydrolysis rate constant:
- 0.005 d-1
- DT50:
- 132 d
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: Hydrolysis rate constant: Lower CI: 0.00484 d^-1, Upper CI: 0.00567 d^-1
- Remarks:
- Half-Life: Lower CI: 122 d. Upper CI: 143 d
- Key result
- pH:
- 9
- Temp.:
- 25 °C
- Hydrolysis rate constant:
- 0.012 h-1
- DT50:
- 55.7 h
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: Hydrolysis Rate Constant: Lower CI: 0.0122 d^-1, Upper CI: 0.0127 d^-1
- Remarks:
- Half-Life: Lower CI: 55 d. Upper CI: 57 d.
- Details on results:
- TEST CONDITIONS
- pH, sterility, temperature, and other experimental conditions maintained throughout the study: Yes
Reference
The Tier 1 study indicated that the test substance is stable at pH 4 but hydrolyses at pH 7 (roughly estimated half-life of 6.6 d) and pH 9 (roughly estimated half-life < 1 d).
Description of key information
Half-life (pH 4): 313 d, 95% CI: 265 – 381 d (OECD 111, 25 °C, 30 d)
Half-life (pH 7): 132 d, 95% CI: 122 – 143 d (OECD 111, 25 °C, 30 d)
Half-life (pH 9): 55.7 h, 95% CI: 55 – 57 h (OECD 111, 25 °C, 30 d)
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 132 d
- at the temperature of:
- 25 °C
Additional information
There is one GLP study available, in which the hydrolysis of the substance was investigated according to the OECD guideline 111.
Hydrolysis was investigated in a two-tiered approach at pH 4, 7, and 9 at 50 °C (tier 1) and 25 °C (tier 2). Hydrolysis was monitored for a maximum of 30 d or until 90% hydrolysis was observed. For the test, sterile test solutions containing the test item (50 mg/L, nominal) in three different buffers were prepared in closed test vessels, which were placed on a stirring device in a thermostat cabinet in the dark. Samples were taken at regular intervals and hydrolysis was monitored by HPLC analysis. Sterility was maintained throughout the test.
The Tier 1 study indicated that the test substance is stable at pH 4, but hydrolyses at pH 7 (roughly estimated half-life of 6.6 d) and 9 (roughly estimated half-life < 1 d). In the Tier 2 study, the test item concentration showed a constant decrease over time, which was very slow at pH 4, slightly faster at pH 7 and fastest at pH 9. Since all plots of the log-transformed concentration vs. time yielded a linear function, it was assumed that hydrolysis follows a pseudo-first order reaction and that the hydrolysis rate constant (Kobs) as well as half-life (t0.5) could be calculated in the standard way. The hydrolysis rate constant Kobs as well as the calculated half-life (including 95% confidence intervals) were 0.00222 d^-1 and 313 d (265 – 381 d) at pH 4 (25 °C), 0.0056 d^-1 and 132 d (122 – 143 d) at pH 7 and 0.0124 ^h-1 and 55.7 h (55 – 57 h) at pH 9.
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.