Ammonium benzoate

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25. Apr 2017 - 08. Sept. 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: Knudsen cell

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material:
608031
- Expiration date of the lot/batch: 25. Oct. 2018
- Purity test date:
not stated

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material:
Room temperature
- Stability under test conditions:
assumed stable
- Solubility and stability of the test substance in the solvent/vehicle:
soluble in alcohol and water and assumed stable
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium:
not expected

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
none

Test no.:

#1

Temp.:

303.2 K

Vapour pressure:

0.532 Pa

Test no.:

#2

Temp.:

318.2 K

Vapour pressure:

2.75 Pa

Test no.:

#3

Temp.:

333.2 K

Vapour pressure:

7.27 Pa

Key result

Temp.:

20 °C

Vapour pressure:

0.214 Pa

Remarks on result:

other: calculated from regression equation

Key result

Temp.:

25 °C

Vapour pressure:

0.354 Pa

Remarks on result:

other: calculated from regression equation

Conclusions:

For Ammonium benzoate, following values are calculated:
Vapour pressure at 20 °C: 2.14 * 10-01Pa
Vapour pressure at 25 °C: 3.54 * 10-01Pa

Executive summary:

The vapour pressure ofAmmonium Benzoatewas determinedaccording to OECD 104 resp.EU A.4 using the effusion method (weight loss).

As the vapour pressure at the first determination series (diameter 1 mm) was too high for relevant values, the measurement was stopped and a second determination series (diameter 0.5) was started.

Vapour pressure wasexamined at four different temperatures. Three temperaturescould be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (p).

Table3‑a         Vapour Pressures (Effusion Method)

Experiment	T	Mean p	Stand. Dev. p	RSD p
No.	K	Pa	Pa	%
1	303.2	5.32E-01	4.16E-02	7.8%
2	318.2	2.75	2.06E-01	7.5%
3	333.2	7.27	1.06	14.6%

In this table, E-0X represents multiplication with 10^-x.

Stand. Dev. = Standard Deviation; RSD = Relative Standard Deviation

The graph 1/T vs. log (p) shows a straight line with a correlation coefficient of - 0.9929.

 

For the test itemAmmonium Benzoate, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:

Vapour pressure at 20 °C:          2.14* 10^-01Pa

Vapour pressure at 25 °C:          3.54* 10^-01Pa

Description of key information

one valid Guideline study available

Key value for chemical safety assessment

Vapour pressure:

0.214 Pa

at the temperature of:

20 °C