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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-03-19 to 2018-08-23
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
- Test item: Pationic ISL
- CAS No.: 66988-04-03
- Molecular weight: 450.59 g/mol
- Sum formula: C24H43O6Na
- Identity: 67.8% acid value, 213 saponification value
- Physical state: Yellow viscous liquid
- Storage: 10 °C - 30 °C
Temp.:
20 °C
Vapour pressure:
0.005 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.006 Pa
Temp.:
50 °C
Vapour pressure:
0.013 Pa

The vapour pressure was first measured using the static method. However, this method showed an unusually low variable B. Therefore, the measurement was repeated with the effusion method. The vapour pressure was measured in the temperature range of 50 °C to 100 °C. The measured vapour pressures at the corresponding temperatures as well as the mass losses per time interval are given in Table 1. After the measurement a mass loss of approx. 7% (w/w) was determined.

Table 1: Measured vapour pressures and corresponding temperatures

Temperature / °C

Δm/Δt / g/min

Vapour pressure / hPa

50

not evaluable

not evaluable

60

7.4x10E-5

3.8x10E-4

70

4.2x10E-5

2.2x10E-4

80

6.3x10E-5

3.3x10E-4

90

6.5x10E-5

3.5x10E-4

100

9.0x10E-5

4.9x10E-4

The data point measured at 60 °C was not included in the linear regression because it showed a typical deviation caused by volatile impurities at the beginning of the measurement.. The values for 20, 25 and 50 °C are calculated using Antoine constants. The vapour pressure values for the test item were extrapolated from the experimental data.

Conclusions:
The vapour pressure of the test item was determined according to OECD guideline 104 by effusion method using a Knudsen cell. The vapour pressure was measured in the temperature range of 50 °C to 100 °C (experimental vapour pressure at 50 °C was not evaluable). The vapour pressures for 20 °C, 25 °C and 50 °C were extrapolated from experimental data:
20 °C: 4.7 x 10E-3 Pa;
25 °C: 5.6 x 10E-3 Pa;
50 °C: 1.3 x 10E-2 Pa.
Executive summary:

The vapour pressure of the test item was determined according to OECD guideline 104 by effusion method using a Knudsen cell. The vapour pressure was measured in the temperature range of 50 °C to 100 °C (experimental vapour pressure at 50 °C was not evaluable). The vapour pressures for 20 °C, 25 °C and 50 °C were extrapolated from experimental data:

20 °C: 4.7 x 10E-3 Pa;

25 °C: 5.6 x 10E-3 Pa;

50 °C: 1.3 x 10E-2 Pa.

Description of key information

The vapour pressure of the test item was determined according to OECD guideline 104 by effusion method using a Knudsen cell. The vapour pressure was measured in the temperature range of 50 °C to 100 °C. The vapour pressures for 20 °C, 25 °C and 50 °C were extrapolated from experimental data:

20 °C: 4.7 x 10E-3 Pa;

25 °C: 5.6 x 10E-3 Pa;

50 °C: 1.3 x 10E-2 Pa.

Key value for chemical safety assessment

Vapour pressure:
0.006 Pa
at the temperature of:
25 °C

Additional information

Experimental vapour pressure at 50 °C was not evaluable.

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