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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:
Experimental Dates: 14 to 22 October 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognised method, and under GLP. The substance is adequately characterised. Therefore full validation applies.
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
March 23, 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Regulation (EC) No 440/2008, with last update to the A.4 method by Commission Regulation (EC) No 761/2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed on 15 Nov. 2018
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
Actual storage conditions: Ambient temperature away from light. Kept in the original container.
Temp.:
20 °C
Vapour pressure:
5 Pa
Key result
Temp.:
25 °C
Vapour pressure:
8.7 Pa

First trial

 Temperature (°C)  Vapour pressure (Pa)
 22.8  6.8759
 26.0  9.3675
 32.7  20.0684
 39.8  41.7752
 47.6  83.4240

A plot of log10 (VP) versus reciprocal temperature (1/T) (with VP in Pa and T in K) gives the following relationship:

Log10 (VP (Pa)) = -4206.8/ T (K) + 15.048

R² = 0.9992

The above equation yields a vapour pressure of 4.99 Pa at 293.15 K and 8.69 Pa at 298.15 K.

Second trial

 Temperature (°C)  Vapour pressure (Pa)
 22.7  6.8382
 26.0  9.3307
 32.4  19.7705
 39.5  41.7740
 47.1  83.9106

A plot of log10 (VP) versus reciprocal temperature (1/T) (with VP in Pa and T in K) gives the following relationship:

Log10 (VP (Pa)) = -4294.0 / T (K) + 15.342

R² = 0.9991

The above equation yields a vapour pressure of 4.94 Pa at 293.15 K and 8.70 Pa at 298.15 K.

The test item did not change in appearance under the conditions used in the determination.

Mean of trials 1 and 2: 4.97 Pa at 293.15 K (20°C) and 8.70 Pa at 298.15 K (25°C).

Conclusions:
Low volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), << 500 Pa).
Executive summary:

The vapour pressure of the test substance was measured, under GLP, according to OECD 104 / EU A4 guideline, using the Knudsen effusion method.

Two trials were performed. For each trial, five pairs temperature/mass loss were used to calculate corresponding vapour pressure of the substance at temperatures between ca 25 and 50°C. Then the logarithm of the vapour pressure log10 (VP(Pa)) is plotted against 1/T(K), and the regression curve is

used to calculate the vapour pressure of the substance at 20°C and 25°C.

The vapour pressure of the test substance is 5.0 Pa at 20°C and 8.7 Pa at 25°C.

Description of key information

Low volatility.

Key value for chemical safety assessment

Vapour pressure:
8.7 Pa
at the temperature of:
25 °C

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. Therefore, it is considered as a key study. The interpolated result at 25°C is retained as key value.