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Diss Factsheets

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
24 January 2018 - 16 February 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 guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry

Test material

Constituent 1
Chemical structure
Reference substance name:
Acetic acid, esters with lanolin alcs.
EC Number:
262-980-8
EC Name:
Acetic acid, esters with lanolin alcs.
Cas Number:
61788-49-6
Molecular formula:
C29H48O2
IUPAC Name:
Acetic acid, esters with lanolin alcs.
Test material form:
liquid

Results and discussion

Vapour pressureopen allclose all
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.002 Pa
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 mm Hg
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.004 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 mm Hg

Any other information on results incl. tables

Results of the Vapour pressure Isothermal TGA Analysis

Temperature (°C)

Weight loss (µg/min)

VT (g/cm²/h)

log VT

log PT

PT (Pa)

90

0.560586

6.69E-05

-4.17

-0.21

0.62

0.643469

7.68E-05

-4.11

-0.13

0.74

100

0.927161

1.11E-04

-3.96

0.07

1.2

1.02751

1.23E-04

-3.91

0.13

1.4

110

1.51791

1.81E-04

-3.74

0.35

2.2

1.64927

1.97E-04

-3.71

0.39

2.5

120

2.31951

2.77E+00

-3.56

0.58

3.8

2.57413

3.07E-04

-3.51

0.64

4.4

 

 

Vapour Pressure of Test Item

Temperature (°C)

Log Pt

Pt (Pa)

Pt (mmHg)

20

-2.62

2.40E-05

1.80E-05

25

-2.41

3.90E-03

2.90E-05

Applicant's summary and conclusion

Conclusions:
The vapour pressure of the test item at 20°C (293K) was 2.4E-3 Pa and 1.8E-5 mm Hg.

The vapour pressure of the test item at 25°C (298K) was 3.9E-3 Pa and 2.9E-5 mm Hg.
Executive summary:

The vapour pressure of the test item (PT) was determined by the isothermal thermogravimetric effusion method.  The method is validated in the range 10E-8 - 10E3 Pa using a set of five reference substances with known vapour pressures.  The validity of the method was verified maximum one month before this study using hexachlorobenzene as reference control substance.  Since the logarithm of the evaporation rate at 20°C (log vT, 20) deviated < 10% from the average value obtained during the validation test, it was possible to apply the constants obtained with the validation test for the determination of the vapour pressure of the test item. An amount of 15.8 or 19.6 mg of the test item was applied to the surface of a roughened glass plate as a homogeneous layer.  The weight loss of the test item was measured continuously as a function of time. The weight loss of the test item was measured continuously as a function of time at defined isothermal temperatures.  The evaporation rate of the test item (vT) was calculated from the weight loss of the compound.  The PT values at the defined isothermal temperatures were determined using the vapour pressure equation with the constants c and d specific for the experimental arrangement.  Linear regression analysis of the log PT values and 1/T was performed using a least squares method.  The PT values of the test item at 20°C and 25°C were determined using the vapour pressure regression curve. The vapour pressure of the test item at 20°C (293K) was 2.4E-3 Pa and 1.8E-5 mm Hg. The vapour pressure of the test item at  25°C (298K) was: 3.9E-3 Pa and 2.9E-5 mm Hg.