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EC number: 306-060-7 | CAS number: 95873-69-1
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- May-June 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
- Report date:
- 2018
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- GLP compliance:
- yes
- Type of method:
- effusion method: isothermal thermogravimetry
Test material
- Reference substance name:
- Sodium [(6-hydroxy-4-methyl-2-oxo-2H-1-benzopyran-7-yl)oxy]acetate
- EC Number:
- 306-060-7
- EC Name:
- Sodium [(6-hydroxy-4-methyl-2-oxo-2H-1-benzopyran-7-yl)oxy]acetate
- Cas Number:
- 95873-69-1
- Molecular formula:
- C12H10O6.Na
- IUPAC Name:
- sodium [(6-hydroxy-4-methyl-2-oxo-2H-1-benzopyran-7-yl)oxy]acetate
- Test material form:
- solid: particulate/powder
- Details on test material:
- Batch 44034
Description: Cream to light grey powder
Expiry date: 30 November 2019
Storage conditions: Controlled room temperature (15-25 ºC, below 70 RH%).
Constituent 1
- Specific details on test material used for the study:
- Storage Conditions at Test Facility:
At 20 °C ± 5°C, in the dark
Test Item Preparation (GLP)
The test item is solid and was suspended with acetone. The glass plate with the test sample was subsequently dried at room temperature.
Results and discussion
Vapour pressure
- Key result
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0.559 Pa
Any other information on results incl. tables
Plot of the evaporation rate versus temperature (1000/T) temperature range of 80 °C to 110 °C (Test Item)
y = -1.9936x + 2.1834
The coefficient of correlation (R2) was 0.9702.
Calibration of the reference items : y = 1.0022x + 4.3781
The coefficient of correlation (R2) was 0.9825.
Applicant's summary and conclusion
- Conclusions:
- The isothermal thermogravimetric effusion method was applied for the determi-nation of the vapour pressure of Isomethol.
A value of the vapour pressure of the test item was determined using the data obtained between 70 °C and 110 °C. The vapour pressure of the test item was calculated (mean of three determinations) to: 5.59 x 10-1 Pa at 20 °C. - Executive summary:
The evaluation of the vapour pressure was done with the re-producible weight loss values above ≥ 1 μg/min in the temperature range be-tween 80 °C to 110 °C (below the melting point).
The resulting equation was:
log PT=4.3781+1.0022∙log VT
Inserting the equation for log VT above, the following equation for the temperature dependence of the vapour pressure of the test item is obtained:
log PT=C+D x (a x 1000/T +b)= C+(D x b)+(D x a x 1000 )/T
(where: a = -1.9936, b =2.1834, C = 4.3781 and D = 1.0022)
With this equation, a following vapour pressure results were obtained: 5.59 x 10-1 Pa at 20 °C.
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