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EC number: 254-104-8 | CAS number: 38725-13-2
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- From 22/12/2017 to 20/09/2018
- 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)
- Version / remarks:
- 23 March 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 23 July 2009
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: Knudsen cell
Test material
- Reference substance name:
- Triisononylamine
- EC Number:
- 254-104-8
- EC Name:
- Triisononylamine
- Cas Number:
- 38725-13-2
- Molecular formula:
- C27H57N
- IUPAC Name:
- tris(7-methyloctyl)amine
- Test material form:
- liquid
Constituent 1
Results and discussion
Vapour pressureopen allclose all
- Key result
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0.015 Pa
- Key result
- Test no.:
- #1
- Temp.:
- 25 °C
- Vapour pressure:
- 0.026 Pa
- Key result
- Test no.:
- #2
- Temp.:
- 20 °C
- Vapour pressure:
- 0.013 Pa
- Key result
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- 0.028 Pa
Any other information on results incl. tables
Triisononylamine: vapour pressure determination
First trial
Mass loss (mg) |
Mass loss duration (s) |
Vapourpressure (Pa) |
Temperature (K) |
1/T (K-1) |
Log10(p) |
1.318 |
600 |
11.1640 |
370.25 |
0.0027 |
1.0478 |
3.003 |
600 |
25.8827 |
383.35 |
0.0026 |
1.4130 |
7.194 |
600 |
63.1187 |
397.25 |
0.0025 |
1.8002 |
15.726 |
600 |
140.5406 |
412.15 |
0.0024 |
2.1478 |
A plot of Log10(p) versus reciprocal temperature (1/T) (with p in Pa and T in K) gives the following statistical data using an unweighted least square treatment.
Slope -4029.6
Intercept 11.931
R² 0.9996
The results obtained indicate the following vapour pressure relationship:
Log10(p (Pa)) = -4029.6 / T (K) +11.931
The above equation yields avapourpressure of 1.53. 10-2 Pa at 293.15 K and 2.60. 10-2 Pa at 298.15 K.
Second trial
Mass loss (mg) |
Mass loss duration (s) |
Vapourpressure (Pa) |
Temperature (K) |
1/T (K-1) |
Log10(p) |
1.216 |
600 |
10.2986 |
370.15 |
0.0027 |
1.0128 |
2.981 |
600 |
25.7031 |
383.65 |
0.0026 |
1.4100 |
7.229 |
600 |
63.4737 |
397.85 |
0.0025 |
1.8026 |
15.803 |
600 |
141.3657 |
412.95 |
0.0024 |
2.1503 |
A plot of Log10(p) versus reciprocal temperature (1/T) (with p in Pa and T in K) gives the following statistical data using an unweighted least square treatment.
Slope -4079
Intercept 12.039
R² 0.9994
The results obtained indicate the following vapour pressure relationship:
Log10(p (Pa)) = -4079 / T(K) + 12.039
The above equation yields avapourpressure of 1.33. 10-2 Pa at 293.15 K and 2.28. 10-2 Pa at 298.15 K.
Summary of Results
Trial |
Vapour pressure at 293.15 K |
Vapour pressure at 298.15 K |
1 |
1.53. 10-2Pa |
2.60. 10-2Pa |
2 |
1.33. 10-2Pa |
2.28. 10-2Pa |
Mean |
1.43. 10-2Pa |
2.44. 10-2Pa |
The test item did not change in appearance under the conditions used in the determination.
Applicant's summary and conclusion
- Conclusions:
- The vapour pressure of Triisononylamine was measured using the Knudsen effusion method as described in EU method A.4 and OECD 104. Two trials were performed. For each trial, four pairs temperature/mass loss were used to calculate corresponding vapour pressure of the substance at specified temperatures. Then the logarithm of the vapour pressure log10 (p(Pa)) is plotted against 1/T(K), and the regression curve is used to calculate the vapour pressure of the substance at 20°C and 25°C.
From the linear regression obtained in the first trial, the vapour pressure of test item Triisononylamine was calculated as 1.53. 10-2 Pa at 20°C and 2.60. 10-2 Pa at 25°C.
From the linear regression obtained in the second trial, the vapour pressure of test item Triisononylamine was calculated as 1.33. 10-2 Pa at 20°C and 2.28. 10-2 Pa at 25°C.
The difference between the trials at 25°C is less than 20%.
Therefore, the results of this study are considered valid.
In conclusion, the vapour pressure of Triisononylamine is 1.43. 10-2 Pa at 20°C and 2.44. 10-2 Pa at 25°C. - Executive summary:
A study was performed to determine the vapour pressure of the test item Triisononylamine. The method followed was designed to be compliant with the OECD Guideline for Testing of Chemicals No. 104, "Vapour Pressure", adopted in March 2006 and Regulation (EC) No 761/2009, EC A4, 23 July 2009. Tests were conducted according GLP.
In this dynamic method, the mass of the test substance flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions was determined at various specified temperatures (from 96.9°C to 139.8°C). The Hertz-Knudsen equation was used to calculate the vapour pressure corresponding to the mass loss rate.
The Log10 (Vapour Pressure (Pa)) was plotted against 1/T (K) and a linear function was obtained. With this equation, the vapour pressure has been calculated for temperatures of 20°C and 25°C.
Two trials were conducted and five points were recorded for each trial.
Log10 (Vapour Pressure (Pa)) was plotted against reciprocal temperature and values of vapour pressure were calculated at 20°C and 25°C with the linear function parameters (slope and intercept):
From the linear regression obtained in the first trial, the vapour pressure of test item Triisononylamine was calculated as 1.53. 10-2 Pa at 20°C and 2.60. 10-2 Pa at 25°C.
From the linear regression obtained in the second trial, the vapour pressure of test item Triisononylamine was calculated as 1.33. 10-2 Pa at 20°C and 2.28. 10-2 Pa at 25°C.
Calculated values respect validity criteria (less than 20% of difference) and the linear functions obtained own a correlation coefficient R² over 0.95. Moreover the calculated values showed good correspondence with the experimentally determined ones.
In conclusion, the vapour pressure of Triisononylamine is 1.43. 10-2 Pa at 20°C and 2.44. 10-2 Pa at 25°C.
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