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Physical & Chemical properties

Vapour pressure

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Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2011
Report Date:
2011

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
yes (incl. certificate)
Type of method:
dynamic method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
other: liquid
Details on test material:
Name of test material (as cited in study report): "2-Methylpentanal"
Analytical purity: 98-100%
Lot/batch No.: B902 from 2011-05-17
Storage condition of test material: Refrigerator, under nitrogen

Results and discussion

Vapour pressureopen allclose all
Temp.:
20 °C
Vapour pressure:
19.3 hPa
Remarks on result:
other: calculated from the regression equation
Temp.:
25 °C
Vapour pressure:
25.5 hPa
Remarks on result:
other: calculated from the regression equation
Temp.:
50 °C
Vapour pressure:
88.4 hPa
Remarks on result:
other: calculated from the regression equation

Any other information on results incl. tables

Results:

The experimental results of the vapour pressure as a function of the temperature are compiled in the table below.

Temperature
[t/°C]
Vapour Pressure
[p/hPa]
  Measurement Calculation
20.62 19.94 19.957
27.93 29.92 29.870
37.93 49.87 49.971
44.88 69.86 69.840
52.68 99.82 99.642
69.31 199.7 199.39
79.95 299.7 298.49
94.93 499.6 502.99
105.36 699.7 703.11
117.02 1003.9 997.66

The vapour pressure as a function of the temperature may be expressed by the following regression equation:

ln(p/hPa) = 16.6675-3289.53/ (219.95 + t / °C)

The vapour pressure at 20 °C, 25 °C and 50 °C was calculated from this equation.

The test item is liquid in the temperature range of the measurements.

Temperature, t/°C

Vapour pressure, p/hPa

20

19.3

25

25.5

50

88.4

Applicant's summary and conclusion