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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:
03 August 2017 - 09 April 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study was conducted in accordance with international guidelines and in accordance with GLP. All guideline validity criteria were met.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Regulation (EC) 440/2008 of 30 May 2008
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
23 March 2006
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
< 0.032 Pa
Remarks on result:
other: Limit value.
Remarks:
No evaluable vapour pressure curve could be determined for this test item. The vapour pressure limit value is therefore reported based on a measured vapour pressure value at 40.5 °C.
Key result
Temp.:
25 °C
Vapour pressure:
< 0.032 Pa
Remarks on result:
other: Limit value.
Remarks:
No evaluable vapour pressure curve could be determined for this test item. The vapour pressure limit value is therefore reported based on a measured vapour pressure value at 40.5 °C.
Key result
Temp.:
50 °C
Vapour pressure:
< 0.032 Pa
Remarks on result:
other: Limit value.
Remarks:
No evaluable vapour pressure curve could be determined for this test item. The vapour pressure limit value is therefore reported based on a measured vapour pressure value at 40.5 °C.

Table 1:          Results of the first measurement using the Effusion method: Knudsen cell

No.

Temperature / °C

Vapour pressure / Pa

1

40.6

6.60 × 10-1

2

50.7

1.24 × 10-1

3

60.7

4.53 × 10-2

4

70.9

1.26 × 10-2

5

80.8

4.14 × 10-3

In the first measurement with undried test item, the vapour pressure was determined for 5 temperatures in the temperature range of 41 – 81 °C.  The fact that the undried test item showed a decreasing vapour pressure with increasing temperature, which may be caused by evaporating of a volatile component (water), a second measurement with dried test item was therefore carried out.  In addition, the test item has swollen and has partially blocked the orifice of the Knudsen cell.

Table 2:          Results of the second measurement using the Effusion method: Knudsen cell

No.

Temperature / °C

Vapour pressure / Pa

1

40.5

3.15 × 10-2

2

50.6

1.05 × 10-2

3

60.7

9.33 × 10-3

4

70.8

5.28 × 10-3

5

80.8

4.72 × 10-3

6

90.8

3.64 × 10-3

7

100.9

3.07 × 10-3

As the dried test item also demonstrated decreasing vapour pressure with increasing temperature, the Antoine constants cannot be evaluated in the measured temperature range. Therefore, the vapour pressure will be estimated according to the measured vapour pressures.  The estimation of vapour pressure will be made using the maximum vapour pressure recorded in the second measurement.  This value was deemed to be more reliable due to the test item swelling observed during the first measurement.

The dried test item Benzenesulfonic acid, 4-C10-13-sec-alkyl derivs., ammonium salts showed no evaluable vapour pressure curve in the temperature range of 40 to 101 °C. The vapour pressures for the temperatures 20, 25 and 50 °C are therefore estimated on the basis of the maximum measured vapour pressures, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006) as shown in Table 3.

 

Table 3:          Estimated vapour pressure values for 20, 25 and 50 °C

Temperature / °C

Vapour pressure / Pa

20

< 3.2 × 10-2

25

< 3.2 × 10-2

50

< 3.2 × 10-2

 

Conclusions:
The vapour pressure of the test item has been determined to be < 0.032 Pa at 20.0 °C
Executive summary:

EU Method A.4. – The vapour pressure of the test item was sought utilising the effusion method (Knudsen cell).  The procedure employed was designed to be compatible with Method A.4. Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008.

The vapour pressure of the test item was measured across a temperature range of 40.5 °C to 100.9 °C.  Values measured across this range showed poor linear response with vapour pressure decreasing with increasing temperature.  This phenomenon was observed in both a wet and dried sample.  As such a limit value was determined based on a measured vapour pressure value at 40.5 °C.

The vapour pressure of the test item has been determined to be < 0.032 Pa at 20.0 °C.

Description of key information

Vapour Pressure: 0.032 Pa at 20°C; EU Method A.4.; S Seitz (2018)

Key value for chemical safety assessment

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

Additional information

EU Method A.4. – The vapour pressure of the test item was sought utilising the effusion method (Knudsen cell).  The procedure employed was designed to be compatible with Method A.4. Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008.

The vapour pressure of the test item was measured across a temperature range of 40.5 °C to 100.9 °C.  Values measured across this range showed poor linear response with vapour pressure decreasing with increasing temperature.  This phenomenon was observed in both a wet and dried sample.  As such a limit value was determined based on a measured vapour pressure value at 40.5 °C.

The vapour pressure of the test item has been determined to be < 0.032 Pa at 20.0 °C.