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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 October - 05 December, 2017
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:
23rd March 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
August 24, 2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Remarks on result:
other: 20 °C: 2.650 x 10-8 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Remarks on result:
other: 25 °C: 5.899 x 10-8 Pa

The vapour pressure was measured in the temperature range of 140 to 168 °C. For the evaluation the vapour pressure values in the range of 144 to 168 °C were used. The measured vapour pressure values together with the measured temperatures are listed in Table

Results of the Effusion method

Stage No.

Temperature, °C

¿m/¿t, mg/min

Vapour pressure, Pa

1

144.0

2.0962 x 10-4

4.1865 x 10-2

2

148.0

2.5814 x 10-4

5.1802 x 10-2

3

152.0

3.2701 x 10-4

6.5934 x 10-2

4

156.0

4.5342 x 10-4

9.1849 x 10-2

5

160.0

6.4018 x 10-4

1.3029 x 10-1

6

164.0

9.2700 x 10-4

1.8953 x 10-1

7

168.0

1.1712 x 10-3

2.4054 x 10-1

 

The vapour pressure of the test item p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C:

 

Vapour pressure of

p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) at 20 °C:2.650 x 10-8Pa

Vapour pressure of

p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) at 25 °C:5.899 x 10-8Pa

 

Conclusions:
The vapour pressure of the test item p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C:

Vapour pressure of
p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) at 20 °C: 2.650 x 10-8 Pa
Vapour pressure of
p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) at 25 °C: 5.899 x 10-8 Pa
Executive summary:

Vapour pressure of p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) was determined using Vapor Pressure Analyzer (Knudsen Effusion Method).

The following result was obtained:

Vapour pressure of p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) at 20 °C:2.650 x 10-8Pa Vapour pressure of p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) at 25 °C:5.899 x 10-8Pa.

 

Description of key information

The vapour pressure of p-Nitrobenzoic acid, compound with 2,2’,2”-nitrilotriethanol (1:1) was assessed using the Knudsen Effusion Method according to the guidelines OECD 104 and EU method A.4 (Klimisch 1, Toxicoop, 2017). In this study, the vapour pressure of the test item was 2.650 x 10 -8Pa at 20°C (293K) and 5.899 x 10 -8Pa at 25°C (298K).

Key value for chemical safety assessment

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

Additional information