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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 26-September-2016 to 09-February-2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Remarks:
GLP compliant
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
Inspection dates: 13 - 15 October 2015 / Date of the certificate: 13 January 2016
Type of method:
static method
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
1 828 Pa
Remarks on result:
other:
Remarks:
Mean of runs 1 and 2

Full test results

 Temperature (°C)  Temperature (K)  Pressure (mbar)  **Pressure (Pa)
          Run 1
 *20  293.15  16.16  1616
 -13.0  260.15  1.8  180
 -7.8  265.35  2.5  250
 1.6  274.75  5.1  510
 12.7  285.85  10.5  1050
 19.4  292.55  15.8  1580
 21.9  295.05  18.6  1860
 26.0  299.15  22.8  2280
 32.1  305.25  31.1  3110
          Run 2
 *20  293.15  20.40  2040
 -15.9  257.25  2.2  220
 -5.0  268.15  4.4  440
 0.1  273.25  6.6  660
 6.9  280.05  9.8 980
 10.6  283.75  12.4  1240
 10.6  289.15  16.4  1640
 18.4  291.55  18.8  1880
 25.2  298.35  26.0  2600
          Run 3
 *20  293.15  19.90  1990
 -16.9  256.25  1.5  150
 -14.0  259.15  1.8  180
 -9.0  264.15  3.3  330
 -4.8  268.35  4.6  460
 2.0  275.15  7.0  700
 10.3  283.45  11.1  1110
 18.9  292.05  17.8  1780
 21.6  294.75  20.4 2040 

*: Determined by interpolation

**: Calculated

Analysis of the vapour pressure curves indicated that Test Run 3 was not as linear, especially when taking boiling point data into consideration. Therefore the result has been reported as the mean of Test Runs 1 and 2.

As part of the data analysis extrapolation of the vapour pressure curve to the boiling temperature of the test item was investigated to ensure linearity. From this extrapolation the vapour pressure at the boiling point was expected to be around 1000 mbar (1x105 Pa). Due to the sub-zero temperatures at which the test material was degassed, the nature of the vapour pressure curve for the effect of incomplete degassing, and any other chemical changes which might not be visually detectible must be considered.

Extrapolation of the vapour pressure curves to the boiling temperature (stated as 120°C in SDS and TIDS provided by sponsor) gave 1410.17 mbar (1.41 x105 Pa), 1220.59 mbar (1.22 x105 Pa) and 1688.76 mbar (1.69 x105 Pa) for Runs 1, 2 and 3 respectively. However the bending of the curve around the mid-point in Run 3 suggests incomplete degassing (i.e. presence of trapped gasses). As the presence of trapped gasses could influence the vapour pressure results, Run 3 has been included in the report for information purpose only.

Conclusions:
The vapour pressure of Fluorosulfonic Adduct was 1828.0 Pa at 20.0°C (average from two extrapolated values).
Executive summary:

The determination of the vapour pressure of the test item, Fluorosulfonic Adduct, was carried out under GLP compliance, using the static method according to OECD Guideline No. 104 and EU Method A.4 (Vapour pressure).

This method involved placing a quantity of sample in the sample chamber of the glassware and a suitable manometer liquid in the U-tube. The glassware was then positioned in the constant temperature bath set to a desired starting temperature. As the static apparatus and its contents approached temperature equilibrium in the bath, the levels of the manometer liquid were balanced using the positive or negative pressure depending on the direction of displacement. This procedure was repeated until the system achieves temperature and pressure equilibrium (i.e. no significant change in temperature or pressure is observed). The temperature and pressure displayed on the pressure monitors were then recorded. The temperature was subsequently set to a higher temperature (usually 5-25°C higher) and the procedure was repeated until enough data points were obtained.

The vapour pressure analysis was performed three times. Degassing was attempted at ambient temperature, 4°C and -15°C, none of which were successful due to a high rate of loss of test material. The sample was therefore degassed at -25°C, -30°C and -32°C for Test Runs 1, 2 and 3 respectively. However due to the nature of the test material complete degassing was extremely difficult as it was observed that some material was being lost under vacuum.

Extrapolation of the vapour pressure curves to the boiling temperature (stated as 120°C in SDS and TIDS provided by sponsor) gave 1410.17 mbar (1.41 x105Pa), 1220.59 mbar (1.22 x105Pa) and 1688.76 mbar (1.69 x105Pa) for Runs 1, 2 and 3 respectively. However the bending of the curve around the mid-point in Run 3 suggests incomplete degassing (i.e. presence of trapped gasses). As the presence of trapped gasses could influence the vapour pressure results, Run 3 was included in the report for information purpose only. Therefore the result was reported as the mean of Test Runs 1 and 2.

The vapour pressure of the test item at 20°C was 1828.0 Pa (average from two extrapolated values).

Description of key information

The vapour pressure of Fluorosulfonic Adduct was 1828.0 Pa at 20.0°C (average from two extrapolated values).

Key value for chemical safety assessment

Vapour pressure:
1 828 Pa
at the temperature of:
20 °C

Additional information

The determination of the vapour pressure of the test item, Fluorosulfonic Adduct, was carried out under GLP compliance, using the static method according to OECD Guideline No. 104 and EU Method A.4 (Vapour pressure).

The vapour pressure analysis was performed three times. Degassing was attempted at ambient temperature, 4°C and -15°C, none of which were successful due to a high rate of loss of test material. The sample was therefore degassed at -25°C, -30°C and -32°C for Test Runs 1, 2 and 3 respectively. However due to the nature of the test material complete degassing was extremely difficult as it was observed that some material was being lost under vacuum.

Extrapolation of the vapour pressure curves to the boiling temperature (stated as 120°C in SDS and TIDS provided by sponsor) gave 1410.17 mbar (1.41 x105Pa), 1220.59 mbar (1.22 x105Pa) and 1688.76 mbar (1.69 x105Pa) for Runs 1, 2 and 3 respectively. However the bending of the curve around the mid-point in Run 3 suggests incomplete degassing (i.e. presence of trapped gasses). As the presence of trapped gasses could influence the vapour pressure results, Run 3 was included in the report for information purpose only. Therefore the result was reported as the mean of Test Runs 1 and 2.

The vapour pressure of the test item at 20°C was 1828.0 Pa (average from two extrapolated values).