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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:
17 Dec 2018 to 07 Mar 2019
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:
March 04, 2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
March 23, 2006
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
Appearance: Off-white powder
Purity/Composition: 98.8%
Test item storage: At room temperature
Temp.:
20 °C
Vapour pressure:
<= 0 Pa
Temp.:
25 °C
Vapour pressure:
<= 0 Pa

A representative weight loss curve of the test item is shown in Figure 4.  The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°C and 25°C are given in Table 2 and Table 3.

The vapour pressure regression curve of the log PT of the test item as function of the reciprocal temperatures is shown in Figure 5.  The equation of the curve was: log PT = -5192 × 1/T + 13.58 (r = 0.995, n = 8).

Table 2       

Results of the Vapour pressure Isothermal TGA Analysis

Temperature [°C] Weight loss [µg/min] νT [g/cm2/h] log νT log PT PT [Pa]
140 5.8441 6.98 × 10-4 -3.16 1.06 12
5.24521 6.26 × 10-4 -3.2 1 10
150 9.36901 1.12 × 10-3 -2.95 1.32 21
8.51091 1.02 × 10-3 -2.99 1.27 19
160 15.9083 1.90 × 10-3 -2.72 1.61 41
14.4372 1.72 × 10-3 -2.76 1.56 36
170 26.8349 3.20 × 10-3 -2.49 1.9 80
25.0736 2.99 × 10-3 -2.52 1.86 73

Table 3       

Vapour Pressure of the Test Item

Temperature [°C] log PT PT[Pa] PT[mm Hg]
20 -4.13 7.5 × 10-5 5.6 × 10-7
25 -3.83 1.5 × 10-4 1.1 × 10-6
Conclusions:
The isothermal TGA effusion method was applied for the determination of the vapour pressure of 2-Benzoylbenzoic acid. The weight losses of the test item had to be determined at temperatures above the melting temperature of the test item. According to this, the vapour pressure of the test item (which was, according to the method, extrapolated to 20°C and 25°C) could be slightly overestimated and is reported as less than or equal to values.
The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was:

20°C: ≤7.5E-5 Pa; ≤5.6 E-7 mmHg
25°C: ≤1.5E-5 Pa; ≤1.1 E-6 mmHg
Executive summary:

In this guideline (OECD 104) study conducted with GLP certification, the test material (EC 201-612-2) was determined to have the following vapour pressures:

  20°C 25°C
[Pa] [mm Hg] [Pa] [mm Hg]
Test item ≤ 7.5× 10-5 ≤ 5.6× 10-7 ≤ 1.5× 10-4 ≤ 1.1× 10-6

Description of key information

Study conducted to recognised testing guidelines with GLP certification.

Key value for chemical safety assessment

Additional information

  20°C 25°C
[Pa] [mm Hg] [Pa] [mm Hg]
Test item ≤ 7.5× 10-5 ≤ 5.6× 10-7 ≤ 1.5× 10-4 ≤ 1.1× 10-6