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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-03-01 - 2017-05-18
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Temp.:
50 °C
Vapour pressure:
0 Pa

Results

The vapour pressure was measured in the temperature range of 51 to 91 °C. The measured vapour pressure values together with the measured temperatures are listed in Table 1:

Table 1:    Results of the Effusion method

No.

Temperature / °C

Vapour pressure / Pa

1

50.7

4.6 × 10-4

2

60.8

8.9 × 10-4

3

70.9

2.0 × 10-3

4

80.9

4.3 × 10-3

5

91.0

7.3 × 10-3

The measured vapour pressures no. 1 and 2 are slightly outside the measuring range (10-3 to 1 Pa) of the Knudsen cell. Nevertheless, as the vapour pressure values below 10-3 Pa could be detected properly by the Knudsen cell, these values can be used for the evaluation.

From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation

log10 p = A+B/T = A+B/(C + ϑ)

can be derived by regression of the data points to

A = 7.7708

B = -3602.02

C = 273.15.

The vapour pressure of the test item Leuco Sulfur Blue 20 calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006) is shown in Table 2:


 

Table 2:    Calculated vapour pressure values for 20, 25 and 50 °C

Temperature / °C

Vapour pressure / Pa

20

3.0 × 10-5

25

4.9 × 10-5

50

4.2 × 10-4
Conclusions:
Final Results:
The vapour pressure of the test item Leuco Sulfur Blue 20 was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006).

Temperature / °C Vapour pressure / Pa
20 3.0 × 10-5
25 4.9 × 10-5
50 4.2 × 10-4
Executive summary:

Summary

The vapour pressure of the test item Leuco Sulfur Blue 20 was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline No. 104 (2006).

Temperature / °C

Vapour pressure / Pa

20

3.0 × 10-5

25

4.9 × 10-5

50

4.2 × 10-4

Description of key information

The vapour pressure of the test item Leuco Sulfur Blue 20 was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006). At 20 °C the vapour pressure was 3.0E-5 Pa.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information