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EC number: 204-671-2 | CAS number: 124-02-7
- 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:
- Experimental Starting Date: 05 August 2015 Experimental Completion Date: 29 October 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)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.7 (Degradation: Abiotic Degradation: Hydrolysis as a Function of pH)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Radiolabelling:
- no
- Analytical monitoring:
- yes
- Details on sampling:
- Preparation of the Sample Solutions
Stock solutions were prepared in glass flasks at a nominal concentration of 900 mg/L in the three buffer solutions. The stock solutions were split into individual glass headspace vials and sealed with no headspace to reduce the potential for volatization of the test item for each data point. The sample solutions were shielded from light whilst maintained at the test temperature.
Preliminary Test/Tier 1
Sample solutions at pH 4, 7 and 9 were maintained at 50.0 ± 0.5 °C for a period of at least 120 hours.
Analysis of the Sample Solutions
The sample solutions were taken from the water bath at various times and the pH of each solution recorded. The concentration of test item in the stock solutions and sample solutions was determined by high performance liquid chromatography (HPLC).
Samples
An aliquot of each sample was diluted by a factor of 2 using acetonitrile.
Standards
Duplicate standard solutions of test item were prepared in acetonitrile:relevant buffer (1:1 v/v) at a nominal concentration of 450 mg/L.
Matrix blanks
Acetonitrile:relevant buffer (1:1 v/v). - Buffers:
- The determination of hydrolysis as a function of pH was carried out using a procedure designed to be compatible with Method C7 Abiotic Degradation, Hydrolysis as a Function of pH of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 111 of the OECD Guidelines for Testing of Chemicals, 13 April 2004.
The test system used sterile buffer solutions at pH’s 4, 7 and 9.
Table 3.1 – Buffer Solution Specification
Buffer solution
(pH) Components Concentration
(mol dm-3)
4 Citric acid 0.06
Sodium chloride 0.04
Sodium hydroxide 0.07
7 Disodium hydrogen orthophosphate (anhydrous) 0.03
Potassium dihydrogen orthophosphate 0.02
Sodium chloride 0.02
9 Disodium tetraborate 0.01
Sodium chloride 0.02
These solutions were subjected to ultrasonication and degassing with nitrogen to minimize the dissolved oxygen content.
The glassware used to hold the sample solutions and standards was silanized with dichlorodimethylsilane to prevent adsorption of the cationic test item to the glass. - Details on test conditions:
- Refer to details on sampling and analytical methods.
- Duration:
- 120 h
- pH:
- 4
- Temp.:
- 50 °C
- Initial conc. measured:
- 0.903 other: g/L - Sample A
- Duration:
- 120 h
- pH:
- 4
- Temp.:
- 50 °C
- Initial conc. measured:
- 0.893 other: g/L - Sample B
- Duration:
- 120 h
- pH:
- 7
- Temp.:
- 50 °C
- Initial conc. measured:
- 0.915 other: g/L - Sample A
- Duration:
- 120 h
- pH:
- 7
- Temp.:
- 50 °C
- Initial conc. measured:
- 0.916 other: g/L - Sample B
- Duration:
- 120 h
- pH:
- 9
- Temp.:
- 50 °C
- Initial conc. measured:
- 0.875 other: g/L - Sample A
- Positive controls:
- no
- Negative controls:
- no
- Statistical methods:
- Not specified.
- Preliminary study:
- The mean peak heights relating to the standard and sample solutions are shown in table 3.2 (please see remarks on results including tables and figures section).
- Test performance:
- The linearity of the detector response with respect to concentration for all three solution matrices was assessed over the nominal concentration range of 35 to 850 mg/L. These were satisfactory with a correlation coefficient (r) of at least 0.998 being obtained.
- Transformation products:
- not specified
- Details on hydrolysis and appearance of transformation product(s):
- Less than 10% hydrolysis after 5 days at 50°C.
- pH:
- 4
- Temp.:
- 50 °C
- DT50:
- > 1 yr
- pH:
- 7
- Temp.:
- 50 °C
- DT50:
- > 1 yr
- pH:
- 9
- Temp.:
- 50 °C
- DT50:
- > 1 yr
- Other kinetic parameters:
- None.
- Details on results:
- The estimated half-life of the test item at 25 °C for pH 4, 7 and 9 has been shown to be greater than 1 year.
- Validity criteria fulfilled:
- yes
- Conclusions:
- The estimated half-life of the test item at 25 °C for pH 4, 7 and 9 has been shown to be greater than 1 year.
- Executive summary:
The determination of hydrolysis as a function of pH was carried out using a procedure designed to be compatible with Method C7 Abiotic Degradation, Hydrolysis as a Function of pH of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 111 of the OECD Guidelines for Testing of Chemicals, 13 April 2004.
The test system used sterile buffer solutions at pH’s 4, 7 and 9.
Table 3.1– Buffer Solution Specification
Buffer solution
(pH)Components
Concentration
(mol dm-3)
4
Citric acid
0.06
Sodium chloride
0.04
Sodium hydroxide
0.07
7
Disodium hydrogen orthophosphate (anhydrous)
0.03
Potassium dihydrogen orthophosphate
0.02
Sodium chloride
0.02
9
Disodium tetraborate
0.01
Sodium chloride
0.02
These solutions were subjected to ultrasonication and degassing with nitrogen to minimize the dissolved oxygen content.
The glassware used to hold the sample solutions and standards was silanized with dichlorodimethylsilane to prevent adsorption of the cationic test item to the glass.
Conclusion
The estimated half-life of the test item at 25 °C for pH 4, 7 and 9 has been shown to be greater than 1 year.
Reference
Results Please see Attachment 1 of this Summary for the Typical Chromatography. The mean peak areas relating to the standard and sample solutions are shown in the following table:
Table 3.2
Solution |
Mean Peak Area |
Standard 483 mg/L |
3.6915 x 106 |
Standard 468 mg/L |
3.5213 x 106 |
Initial Sample A, pH 4 |
3.4212 x 106 |
Initial Sample B, pH 4 |
3.3839 x 106 |
24 hours Sample A, pH 4 |
3.4849 x 106 |
24 hours Sample B, pH 4 |
3.4552 x 106 |
120 hours Sample A, pH 4 |
3.3506 x 106 |
120 hours Sample B, pH 4 |
3.3828 x 106 |
Standard 483 mg/L |
3.4664 x 106 |
Standard 468 mg/L |
3.3391 x 106 |
Initial Sample A, pH 7 |
3.2706 x 106 |
Initial Sample B, pH 7 |
3.2740 x 106 |
24 hours Sample A, pH 7 |
3.3943 x 106 |
24 hours Sample B, pH 7 |
3.8616 x 106 |
120 hours Sample A, pH 7 |
3.2961 x 106 |
120 hours Sample B, pH 7 |
3.3331 x 106 |
Standard 483 mg/L |
3.4265 x 106 |
Standard 468 mg/L |
3.3429 x 106 |
Initial Sample A, pH 9 |
3.1121 x 106 |
Initial Sample B, pH 9 |
-* |
24 hours Sample A, pH 9 |
2.7741 x 106 |
24 hours Sample B, pH 9 |
2.9420 x 106 |
120 hours Sample A, pH 9 |
3.0742 x 106 |
120 hours Sample B, pH 9 |
3.1210 x 106 |
*Contained a large interfering peak. Therefore the sample was not used in any calculations.
The test item concentrations at the given time points are shown in the following tables:
Table 3.3 pH 4 at 50 ºC
Time (Hours) |
Concentration (g/L) |
% of initial concentration |
||
A |
B |
A |
B |
|
0 |
0.903 |
0.893 |
101 |
99.5 |
24 |
0.920 |
0.912 |
102 |
102 |
120 |
0.884 |
0.893 |
98.5 |
99.4 |
Result: Less than 10% hydrolysis after 5 days at 50 °C, equivalent to a half-life greater than 1 year at 25 °C.
Table 3.4 pH 7 at 50 ºC
Time (Hours) |
Concentration (g/L) |
% of initial concentration |
||
A |
B |
A |
B |
|
0 |
0.915 |
0.916 |
99.9 |
100 |
24 |
0.949 |
1.08 |
104 |
118 |
120 |
0.922 |
0.932 |
101 |
102 |
Result: Less than 10% hydrolysis after 5 days at 50 °C, equivalent to a half-life greater than 1 year at 25 °C.
Table 3.5 pH 9 at 50 ºC
Time (Hours) |
Concentration (g/L) |
% of initial concentration* |
||
A |
B |
A |
B |
|
0 |
0.875 |
-[1] |
100 |
- |
24 |
0.780 |
0.827 |
89.1 |
94.5 |
120 |
0.864 |
0.877 |
98.8 |
100 |
Result: Less than 10 % hydrolysis after 5 days at 50 °C, equivalent to a half-life greater than 1 year at 25 °C.
The results from the Preliminary Test/Tier 1 showed the test item was stable to hydrolysis and therefore it was not necessary to undertake further testing at pH 4, 7 and 9.
*The initial concentration was based on Sample A of the 0 hour time point only.
[1] Contained a large interfering peak. Therefore the sample was not used in any calculations.
Description of key information
The determination of hydrolysis as a function of pH was carried out using a procedure designed to be compatible with Method C7 Abiotic Degradation, Hydrolysis as a Function of pH of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 111 of the OECD Guidelines for Testing of Chemicals, 13 April 2004.
The estimated half-life of the test item at 25 °C for pH 4, 7 and 9 has been shown to be greater than 1 year.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 1 yr
- at the temperature of:
- 25 °C
Additional information
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