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EC number: 263-214-5 | CAS number: 61792-11-8
- 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
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Hydrolysis
Administrative data
Link to relevant study record(s)
- Endpoint:
- hydrolysis
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study performed according to guideline and GLP.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 111 (Hydrolysis as a Function of pH)
- GLP compliance:
- yes (incl. QA statement)
- Specific details on test material used for the study:
- - Names of test material (as cited in study report): Lemonile; 3,7-dimethyl-2,6-nonadienenitrile
- Substance type: Colourless liquid
- Physical state: Liquid
- Analytical purity: 99.4 % (sum of components)
- Lot No: VE00101509
- Expiration date of the lot/batch: 2012-09-09 - Radiolabelling:
- no
- Analytical monitoring:
- yes
- Details on sampling:
- - Sampling intervals for the parent/transformation products: 0.0, 6.0, 24.0, 120.0, 144.0 h
- Buffers:
- Ready made concentrates (Titrisol®, MERCK, Darmstadt, Germany) were used to prepare buffer solutions by dilution with fresh ultrapure, sterile water:
pH 4.00 ± 0.02 at 20°C (art. No. 9884): after dilution:
Citric acid: 0.056 mol/l
NaOH: 0.11 mol/l
HCl: 0.044 mol/l
pH 7.00 ± 0.02 at 20°C (art. No. 9887): after dilution
KH2PO4: 0.026 mol/l
Na2HPO4: 0.041 mol/l
pH 9.00 ± 0.02 at 20°C (art. No. 9889): after dilution
H3BO3: 0.05 mol/l
KCl: 0.05 mol/l
NaOH: 0.022 mol/l
In order to avoid any unnecessary excess of inorganic salts that could reduce the solubility of the test substance, these buffer solutions were diluted to 10% with ultrapure water before being used as test media. - Details on test conditions:
- TEST SYSTEM
- Type, material and volume of test flasks, other equipment used: 20 ml amber-glass vials (crimp caps with Teflon coated rubber septa)
- Sterilisation method: No special sterilising treatmnet other than heating the glassware to 160°C overnight prior to use was applied.
- Is there any indication of the test material adsorbing to the walls of the test apparatus? No
TEST MEDIUM
- Preparation of test medium: The water solubility of Lemonile at 20°C is 42 mg/l.. According to the guidelines the initial concentration to be used for the hydrolysis reaction should not exceed the half of the saturation concentration, or a concentration of 0.01 mol/l. A nominal concentration of 15.0 mg/l was used in the preliminary test. Therefore, a stock solution containing 15.0 g/l of test substance in acetone was prepared. By a 1:1000 dilution of this solution with buffer solution, the test concentration, 15.0 mg/l, was obtained. The amount of carrier solvent (acetone) did not exceed 0.1%, as required by the guidelines - Duration:
- 144 h
- Preliminary study:
- Measured pH values and analytical results are given in Table 1. The criterion given in the guidelines for the preliminary test is:
- If less than 10% degradation after 120h (equivalent to a half-life time higher that 1 year at 25°C) is observed, no further testing is necessary.
This criterion is fulfilled for pH4, pH7 and pH9. For all three pH, < 10% degradation was observed at 50°C over a 138h period (6h to 144h). The concentration was assessed from 6h to 144h since the fast initial drop of concentrations observed during the first 6h of the experiment can be assigned to phenomena other than hydrolysis (adsorption to glassware, septa etc). - Transformation products:
- no
- % Recovery:
- 90.2
- pH:
- 4
- Temp.:
- 50 °C
- Duration:
- 138 h
- Remarks on result:
- other: preliminary test
- % Recovery:
- 95.2
- pH:
- 7
- Temp.:
- 50 °C
- Duration:
- 138 h
- Remarks on result:
- other: preliminary test
- % Recovery:
- 91.2
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 138 h
- Remarks on result:
- other: preliminary test
- Key result
- pH:
- 4
- Temp.:
- 25 °C
- DT50:
- > 1 yr
- Remarks on result:
- hydrolytically stable based on preliminary test
- Key result
- pH:
- 7
- Temp.:
- 25 °C
- DT50:
- > 1 yr
- Remarks on result:
- hydrolytically stable based on preliminary test
- Key result
- pH:
- 9
- Temp.:
- 25 °C
- DT50:
- > 1 yr
- Remarks on result:
- hydrolytically stable based on preliminary test
- Details on results:
- TEST CONDITIONS
- pH, sterility, temperature, and other experimental conditions maintained throughout the study: Yes
MAJOR TRANSFORMATION PRODUCTS
At pH4: None identified
At pH7: None identified.
At pH9: None identified. - Conclusions:
- The half-life time of Lemonile at 25°C is higher than one year at pH4, pH7 and pH9.
- Executive summary:
An abiotic degradation study (hydrolysis as a function of pH) was carried out with Lemonile according to OECD guideline No 111.
Only the preliminary test needed to be performed since, at 50°C, less than 10% hydrolysis occurred at all three pH values of 4, 7 and 9 after 138h. A hydrolysis of less than 10% after 120h, or more, at 50'C corresponds to a half-life time of more than 1 years at 25'C. C, less than 10% hydrolysis occurred at all three pH values of 4, 7 and 9 after 138h. A hydrolysis of less than 10% after 120h, or more, at 50° C corresponds to a half-life time of more than 1 years at 25°C.
Therefore, the half-life time of Lemonile at 25°C is higher than one year at pH4, pH7 and pH9.
Reference
Table 1
All tabulated values represent rounded-off results obtained by calculations based on the exact raw data.
pH |
|
|
|
|
|
t [h] |
0.0 |
6.0 |
24.0 |
120.0 |
144.0 |
pH4, 50°C |
4.00 |
3.99 |
3.98 |
3.97 |
3.98 |
|
3.97 |
3.97 |
3.98 |
3.96 |
3.97 |
pH7, 50°C |
7.02 |
7.04 |
7.06 |
7.06 |
7.05 |
|
7.03 |
7.05 |
7.06 |
7.07 |
7.07 |
pH9, 50°C |
9.01 |
8.98 |
8.97 |
8.97 |
8.98 |
|
8.99 |
8.98 |
8.96 |
8.97 |
8.96 |
|
|||||
Concentrations (aqueous phase): [mg/l] |
|
|
|
|
|
t [h] |
0.0 |
6.0 |
24.0 |
120.0 |
144.0 |
pH4, 50°C |
15.4 |
15.2 |
14.8 |
13.9 |
13.5 |
|
15.6 |
15.3 |
14.9 |
13.8 |
13.9 |
pH7, 50°C |
16.0 |
15.4 |
15.4 |
14.0 |
14.6 |
|
16.0 |
15.2 |
15.3 |
14.2 |
14.5 |
pH9, 50°C |
11.7 |
11.3 |
11.2 |
10.5 |
10.3 |
|
11.7 |
11.2 |
11.2 |
10.5 |
10.2 |
|
|||||
Average Concentrations (aqueous phase): [mg/l] |
|
|
|
|
|
t [h] |
0.0 |
6.0 |
24.0 |
120.0 |
144.0 |
pH4, 50°C |
15.5 |
15.2 |
14.9 |
13.9 |
13.7 |
pH7, 50°C |
16.0 |
15.3 |
15.3 |
14.1 |
14.6 |
pH9, 50°C |
11.7 |
11.2 |
11.2 |
10.5 |
10.2 |
|
|||||
Average Concentrations (aqueous phase): [%] |
|
|
|
|
|
t [h] |
0.0 |
6.0 |
24.0 |
120.0 |
144.0 |
pH4, 50°C |
- |
100.0 |
97.5 |
91.0 |
90.2 |
pH7, 50°C |
- |
100.0 |
100.4 |
92.2 |
95.2 |
pH9, 50°C |
- |
100.0 |
99.5 |
93.5 |
91.2 |
The criterion given in the guidelines for the preliminary test is:
If less than 10% degradation after 120 h (equivalent to a half-life time higher than 1 year at 25°C) is observed , no further testing is required.
This criterion is fulfilled for pH4, pH7 and pH9. For all three pH < 10% degradation was observed at 50°C over a 138 h period (6 h to 144 h).
The fast initial drop of the concentrations observed during the first 6 h of the experiment can be assigned to phenomena other than hydrolysis (adsorption to glassware, septa etc). Therefore the concentration was assessed from 6 h to 144 h. In this 138 h period less than 10% hydrolysis were observed at all three pH values of 4, 7 and 9. A hydrolysis of less than 10% after 120 h or more at 50°C corresponds to a half-life time of more than one year at 25°C.
Description of key information
Half life greater than 1 year at 25 °C at pH 4, 7 and 9 (OECD 111)
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 1 yr
- at the temperature of:
- 25 °C
Additional information
A reliable study was performed in accordance with GLP and OECD Guideline No. 111 to assess the hydrolysis of Lemonile. A nominal concentration of 15 mg/L was used in the preliminary test. The fast initial drop of the concentrations observed during the first 6 h of the experiment can be assigned to phenomena other than hydrolysis (adsorption to glassware, septa etc). Therefore the concentration was assessed from 6 h to 144 h. In this 138 h period less than 10% hydrolysis were observed at all three pH values of 4, 7 and 9. A hydrolysis of less than 10% after 120 h or more at 50 °C corresponds to a half-life time of more than one year at 25°C. The half-life time of Lemonile at 25 °C was therefore found to be greater than one year at pH4, pH7 and pH9.
Since less than 10% degradation was observed in the preliminary test, no further testing was necessary.
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.
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