Registration Dossier

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:
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:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: Knudsen cell

Test material

Reference
Name:
Unnamed
Test material form:
solid: crystalline

Results and discussion

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

Applicant's summary and conclusion

Conclusions:
The vapour pressure of the test item Ammonium Adipate was calculated by extrapolation of
the measured vapour pressure curve for the temperatures 20 and 25 °C:
Vapour pressure of Ammonium Adipate at 20 °C: 4.598 x 10-7 Pa
Vapour pressure of Ammonium Adipate at 25 °C: 1.542 x 10-6 Pa
Executive summary:

The test item was filled into the Knudsen cell before the test and was attached to the
ultrabalance. After that, the system was closed and the apparatus was evacuated. The
method stages had been programmed for various temperatures with a time of 60 minutes per
stage. A total of 11 stages were prepared for the entire measurement. The series of stages
commenced at the lowest desired measuring temperature. While measuring each single
segment, the decrease of weight of the Knudsen cell was measured by the balance. Taking
into account the geometry of the Knudsen cell orifice, physical data of the test item and the
evaporation rate Δm/Δt the vapour pressure was calculated.

The vapour pressure of the test item Ammonium Adipate was calculated by extrapolation of

the measured vapour pressure curve for the temperatures 20 and 25 °C:

Vapour pressure of Ammonium Adipate at 20 °C: 4.598 x 10-7 Pa

Vapour pressure of Ammonium Adipate at 25 °C: 1.542 x 10-6 Pa