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Vapour pressure

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Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
01.03.2018 - 04.05.2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report date:
2018

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: Knudsen cell

Test material

Constituent 1
Chemical structure
Reference substance name:
p-benzoquinone
EC Number:
203-405-2
EC Name:
p-benzoquinone
Cas Number:
106-51-4
Molecular formula:
C6H4O2
IUPAC Name:
1,4-benzoquinone
Test material form:
solid: particulate/powder

Results and discussion

Vapour pressureopen allclose all
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
3 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
3.9 Pa
Key result
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
12.3 Pa

Any other information on results incl. tables

Thermal Stability

In the temperature range of 115 °C – 125 °C the test item showed an endothermic effect, which can be assigned to the melting of the test item. An exothermic effect was observed in the temperature range of 230 °C – 280 °C with an decomposition energy of -1130 J/g. No further thermal effects could be observed up to the maximum test temperature of 300 °C.

Table 1:    Results of the DSC-measurement

No.

Sample weight / mg

Start / °C

Energy / J/g

Remark

PN15073

10.76

115 (endothermic)
230 (exothermic)

+150
-1130

Figure 2

Effusion method: Knudsen cell

The vapour pressure was measured in the temperature range of 30.4 °C to 50.7 °C. The measured vapour pressure values together with the measured temperatures are listed in Table 2:

Table 2:    Results of the Effusion method

No.

Temperature / °C

Vapour pressure / Pa

1

10.1

1.81

2

12.1

1.98

3

13.1

2.18

4

14.2

2.19

5

20.3

3.09

The measured vapour pressure is slightly outside the measuring range (10-3to 1 Pa) of the Knudsen cell. Nevertheless, as the vapour pressure value above 1 Pa could be detected properly by the Knudsen cell, this value 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 were derived by regression of the data points to A = 7.0301, B = -1919.24, C = 273.15.

The vapour pressure of the test itemp-Benzoquinonecalculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20 °C, 25 °C 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 3:

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

Temperature / °C

Vapour pressure / Pa

20

3.0

25

3.9

50

12.3

Applicant's summary and conclusion

Conclusions:
As determined by the effusion method the vapor pressure of p-benzoquinone at 20°C, 25°C and 50°C is 3,0 Pa, 3,9 Pa and 12,3 Pa, respectively.
Executive summary:

The vapour pressure of the test item p-Benzoquinone was calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20 °C, 25 °C 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

25

3.9

50

12.3