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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:
20.03.2018 - 25.04.2018
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:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: OECD Test Guideline 113 (1981) Thermal Stability
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.01 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.018 Pa
Key result
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.3 Pa

Thermal Stability (DSC)

In the temperature range of 115 °C – 135 °C the test item showed an endothermic effect, which can be assigned to the melting of the test item.

Table 1:    Results of the DSC-measurement

No.

Sample weight / mg

Start / °C

Energy / J/g

Remark

PN15236

13.58

115 (endothermic)

+150

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

30.4

3.5 × 10-2

2

35.5

6.2 × 10-2

3

40.6

1.1 × 10-1

4

45.6

1.9 × 10-1

5

50.7

3.2 × 10-1

The vapour pressure of the test item 2 -Naphthol calculated by interpolation 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 Pressureand 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

9.9 × 10-3

25

1.8 × 10-2

50

3.0 × 10-1

Conclusions:
The vapor pressure of 2-Naphthol at 20°C, 25°C and 50°C is 0,0099 Pa, 0,018 Pa and 0,30 Pa, respectively.
Executive summary:

The vapour pressure of the test item 2-Naphthol was calculated by interpolation 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

9.9 × 10-3

25

1.8 × 10-2

50

3.0 × 10-1

Description of key information

A study was performed to determine the vapour pressure of 2-naphthol using a effusion method (Knudsen cell).  The test was conducted in compliance with OECD Test Guideline 104.  It concluded that the vapour pressure of 2-naphthol was 0.0099 Pa at 20 oC.

Key value for chemical safety assessment

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

Additional information