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EC number: 213-485-0 | CAS number: 957-68-6
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- December 11, 2012
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Comparable to guideline study (OECD104) with acceptable restrictions
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 012
- Report date:
- 2012
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- effusion method: vapour pressure balance
Test material
- Reference substance name:
- 3-acetoxymethylen-7-amino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
- EC Number:
- 213-485-0
- EC Name:
- 3-acetoxymethylen-7-amino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
- Cas Number:
- 957-68-6
- Molecular formula:
- C10H12N2O5S
- IUPAC Name:
- (6R,7R)-3-[(acetyloxy)methyl]-7-amino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
- Test material form:
- solid: particulate/powder
- Remarks:
- migrated information: powder
- Details on test material:
- Name: 7-Aminocefalosporansäure (7-ACA)
Lot no.: B146988
Constituent 1
Results and discussion
Vapour pressureopen allclose all
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Temp.:
- 50 °C
- Vapour pressure:
- 0 Pa
Any other information on results incl. tables
The vapour pressure was measured in the temperature range of 48 to 119 °C. The measured vapour pressure values together with the measured temperatures are listed inTable 1.
Table1: Results of the Effusion method
No. |
Temperature / °C |
Vapour pressure / Pa |
1 |
48 |
1.32 ×10-4 |
2 |
53 |
2.02 ×10-4 |
3 |
59 |
3.13 ×10-4 |
4 |
69 |
4.28 ×10-4 |
5 |
79 |
7.25 ×10-4 |
6 |
88 |
1.40 ×10-3 |
7 |
98 |
2.26 ×10-3 |
8 |
103 |
3.92 ×10-3 |
9 |
114 |
5.00 ×10-3 |
10 |
119 |
8.16 ×10-3 |
11 |
124 |
1.35 ×10-2 |
Figure 1on page 11 shows the vapour pressure as a function of the inverse temperature 1/T.
From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation
log10p = A + (B/T)
can be derived by regression of the data points to
A = 4.7452
B = -2759.92.
The vapour pressure of the test item7-Aminocephalosporanic acidcalculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC 440/2008 Method A.4.Vapour Pressureare shown inTable2:
Table2: Calculated vapour pressure values for 20, 25 and 50 °C
Temperature / °C |
Vapour pressure / Pa |
20 |
2.1 ×10-5 |
25 |
3.1 ×10-5 |
50 |
1.6 ×10-4 |
Applicant's summary and conclusion
- Conclusions:
- The vapour pressure of the test item 7-Aminocephalosporanic acid was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC 440/2008 Method A.4. Vapour Pressure:
Temperature / °C Vapour pressure / Pa
20 2.1 ×10-5
25 3.1 ×10-5
50 1.6 ×10-4 - Executive summary:
Once the required vacuum has been obtained (approximately 10-4Pa) and therefrigeration box has been cooled down with liquid nitrogen the measurement was started. The series of measurements was commenced at the lowest desired measuring temperature. The orifice was opened for a certain time and the increase of weight on the balance pan was measured. Under consideration of the geometry of the vapour pressure balance, physical data of the test item and the evaporation rateΔm/Δtthe vapour pressure was calculated.
For further measurements, the temperature was increased by small intervals until the maximum desired temperature value was reached.
The vapour pressure was determined for eleven temperatures. The vapour pressure could be measured in the temperature range 48 to 124 °C and in the pressure range 10-4to 10‑2 Pa.
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