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EC number: 947-985-1 | CAS number: -
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 14 March 2018 to 18 March 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- 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:
- 30 May 2008
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: vapour pressure balance
- Specific details on test material used for the study:
- - Identification: tris(2-hydroxyethyl)methylammonium hydroxide CAS 33667-48-0
- Batch:D26-3-3-1
- Purity:47.4%
- Expiry:01 December 2018
- Storage conditions:Room temperature in the dark - Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0.49 Pa
- Conclusions:
- The vapor pressure of the test item has been determined to be 0.49 Pa at 25 ºC.
- Executive summary:
The vapor pressure of tris(2-hydroxyethyl)methylammonium hydroxide CAS 33667-48-0 has been determined to be 0.49 Pa at 25 °C, using the vapor pressure balance method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.
Reference
Recorded temperatures, mass differences and the resulting calculated values of vapor pressure are shown in the following tables:
Run 2
Table1– Vapor Pressure Data
Temperature (ºC) |
Temperature (K) |
Reciprocal Temperature (K-1) |
Mass Difference (µg) |
Mass Difference (kg) |
Vapor Pressure (Pa) |
Log10Vp |
-5 |
268.15 |
0.0037293 |
21.95 |
2.195e-08 |
0.0304722 |
-1.516096 |
-4 |
269.15 |
0.0037154 |
23.78 |
2.378e-08 |
0.0330127 |
-1.481319 |
-3 |
270.15 |
0.0037016 |
25.73 |
2.573e-08 |
0.0357198 |
-1.447091 |
-2 |
271.15 |
0.0036880 |
29.09 |
2.909e-08 |
0.0403844 |
-1.393787 |
-1 |
272.15 |
0.0036744 |
32.03 |
3.203e-08 |
0.0444659 |
-1.351973 |
0 |
273.15 |
0.0036610 |
34.64 |
3.464e-08 |
0.0480892 |
-1.317952 |
1 |
274.15 |
0.0036476 |
38.97 |
3.897e-08 |
0.0541003 |
-1.266800 |
2 |
275.15 |
0.0036344 |
43.62 |
4.362e-08 |
0.0605557 |
-1.217845 |
3 |
276.15 |
0.0036212 |
48.38 |
4.838e-08 |
0.0671638 |
-1.172865 |
4 |
277.15 |
0.0036082 |
53.68 |
5.368e-08 |
0.0745216 |
-1.127718 |
5 |
278.15 |
0.0035952 |
58.03 |
5.803e-08 |
0.0805605 |
-1.093878 |
A plot of Log10(vapor pressure (Pa)) versus reciprocal temperature (1/T(K)) for Run 2 gives the following statistical data using an unweighted least squares treatment.
Slope: |
-3.24 x 103 |
Standard error in slope: |
50.2
|
Intercept: |
10.6 |
Standard error in intercept: |
0.184 |
The results obtained indicate the following vapor pressure relationship:
Log10(Vp (Pa)) = -3.24 x 103/temp(K) + 10.6
The above yields a vapor pressure (Pa) at 298.15 K with a common logarithm of -0.311.
Run 3
Table2– Vapor Pressure Data
Temperature (ºC) |
Temperature (K) |
Reciprocal Temperature (K-1) |
Mass Difference (µg) |
Mass Difference (kg) |
Vapor Pressure (Pa) |
Log10Vp |
-5 |
268.15 |
0.0037293 |
22.07 |
2.207e-08 |
0.0306388 |
-1.513728 |
-4 |
269.15 |
0.0037154 |
23.08 |
2.308e-08 |
0.0320410 |
-1.494295 |
-3 |
270.15 |
0.0037016 |
25.81 |
2.581e-08 |
0.0358309 |
-1.445742 |
-2 |
271.15 |
0.0036880 |
27.47 |
2.747e-08 |
0.0381354 |
-1.418672 |
-1 |
272.15 |
0.0036744 |
30.26 |
3.026e-08 |
0.0420086 |
-1.376661 |
0 |
273.15 |
0.0036610 |
33.58 |
3.358e-08 |
0.0466176 |
-1.331450 |
1 |
274.15 |
0.0036476 |
38.10 |
3.810e-08 |
0.0528926 |
-1.276605 |
2 |
275.15 |
0.0036344 |
42.92 |
4.292e-08 |
0.0595840 |
-1.224871 |
3 |
276.15 |
0.0036212 |
47.19 |
4.719e-08 |
0.0655118 |
-1.183680 |
4 |
277.15 |
0.0036082 |
52.97 |
5.297e-08 |
0.0735359 |
-1.133500 |
5 |
278.15 |
0.0035952 |
58.93 |
5.893e-08 |
0.0818099 |
-1.087194 |
A plot of Log10(vapor pressure (Pa)) versus reciprocal temperature (1/T(K)) for Run 3 gives the following statistical data using an unweighted least squares treatment.
Slope: |
-3.29 x 103 |
Standard error in slope: |
97.6
|
Intercept: |
10.7 |
Standard error in intercept: |
0.357 |
The results obtained indicate the following vapor pressure relationship:
Log10(Vp (Pa)) = -3.29 x 103/temp(K) + 10.7
The above yields a vapor pressure (Pa) at 298.15 K with a common logarithm of -0.307.
Run 4
Table3– Vapor Pressure Data
Temperature (ºC) |
Temperature (K) |
Reciprocal Temperature (K-1) |
Mass Difference (µg) |
Mass Difference (kg) |
Vapor Pressure (Pa) |
Log10Vp |
-5 |
268.15 |
0.0037293 |
20.35 |
2.035e-08 |
0.0282510 |
-1.548966 |
-4 |
269.15 |
0.0037154 |
22.27 |
2.227e-08 |
0.0309165 |
-1.509810 |
-3 |
270.15 |
0.0037016 |
25.39 |
2.539e-08 |
0.0352478 |
-1.452868 |
-2 |
271.15 |
0.0036880 |
27.37 |
2.737e-08 |
0.0379966 |
-1.420256 |
-1 |
272.15 |
0.0036744 |
30.47 |
3.047e-08 |
0.0423002 |
-1.373658 |
0 |
273.15 |
0.0036610 |
33.77 |
3.377e-08 |
0.0468814 |
-1.328999 |
1 |
274.15 |
0.0036476 |
37.06 |
3.706e-08 |
0.0514488 |
-1.288625 |
2 |
275.15 |
0.0036344 |
42.32 |
4.232e-08 |
0.0587510 |
-1.230985 |
3 |
276.15 |
0.0036212 |
46.15 |
4.615e-08 |
0.0640680 |
-1.193359 |
4 |
277.15 |
0.0036082 |
50.63 |
5.063e-08 |
0.0702874 |
-1.153122 |
5 |
278.15 |
0.0035952 |
56.92 |
5.692e-08 |
0.0790195 |
-1.102265 |
A plot of Log10(vapor pressure (Pa)) versus reciprocal temperature (1/T(K)) for Run 4 gives the following statistical data using an unweighted least squares treatment.
Slope: |
-3.32 x 103 |
Standard error in slope: |
37.9
|
Intercept: |
10.8 |
Standard error in intercept: |
0.139 |
The results obtained indicate the following vapor pressure relationship:
Log10(Vp (Pa)) = -3.32 x 103/temp(K) + 10.8
The above yields a vapor pressure (Pa) at 298.15 K with a common logarithm of -0.306.
The values of vapor pressure at 25 °C extrapolated from each graph are summarized in the following table:
Table 4 Summary of Vapor Pressure Data
Run |
Log10[Vp(25 ºC)] |
2 |
-0.311 |
3 |
-0.307 |
4 |
-0.306 |
Mean |
-0.308 |
Vapor Pressure |
0.493 Pa |
The test item did not change in appearance under the conditions used in the determination.
Discussion
A total of 4 runs were completed for the main sequence. Equilibrium had been reached over the final 3 runs, thus, the final 3 runs have been used to determine the vapor pressure.
The results may represent rounded values obtained by calculations based on the exact raw data.
Description of key information
The vapor pressure of the test substance has been determined to be 0.49 Pa at 25 °C, using the vapor pressure balance method, designed to be compatible with EU Method A.4 and OECD Guideline104.
Key value for chemical safety assessment
- Vapour pressure:
- 0.49 Pa
- at the temperature of:
- 25 °C
Additional information
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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