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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:
1993
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
no
Type of method:
dynamic method
Temp.:
20 °C
Vapour pressure:
1.4 kPa
Remarks on result:
other: calculated
Temp.:
25 °C
Vapour pressure:
1.9 kPa
Remarks on result:
other: calculated
Temp.:
36.9 °C
Vapour pressure:
4 kPa
Remarks on result:
other: measured
Temp.:
50.6 °C
Vapour pressure:
8 kPa
Remarks on result:
other: measured
Temp.:
79.3 °C
Vapour pressure:
30 kPa
Remarks on result:
other: measured
Temp.:
90.8 °C
Vapour pressure:
50 kPa
Remarks on result:
other: measured
Temp.:
100 °C
Vapour pressure:
68.1 kPa
Remarks on result:
other: calculated

Internal study performed according to the dynamic methods described by OECD 104.

Results obtained were:
4 kPa at 36.9°C
8 kPa at 50.6°C
30 kPa at 79.3°C
50 kPa at 90.8°C


From these results, vapour pressure was calculated to be:
1.4 kPa at 20 °C
1.9 kPa at 25 °C

68.1 kPa at 100 °C

The measure is related to the Vapour Pressure of Water; indeed, glyoxylic acid as free acid gaz is not detectable at ambient temperature and under atmospheric pressure. Glyoxylic acid oligomerize when solution is concentrated and decomposes when heating at temperature above 150°C with loss of carbonic acid and water.


Executive summary:

The vapor pressure of Glyoxylic Acid 50% at 20°C is 14 hPa.

Description of key information

The vapor pressure of Glyoxylic Acid 50% at 20°C is 14 hPa. 

Key value for chemical safety assessment

Vapour pressure:
1 400 Pa
at the temperature of:
293 K

Additional information

The study was performed according to the dynamic methods described by OECD 104 and the results were as follows:

4 kPa at 36.9°C
8 kPa at 50.6°C
30 kPa at 79.3°C
50 kPa at 90.8°C

From these results, vapour pressure was calculated to be:
1.4 kPa at 20 °C
1.9 kPa at 25 °C

68.1 kPa at 100 °C

The measure is related to the Vapour Pressure of Water; indeed, Glyoxylic Acid as free acid gas is not detectable at ambient temperature and under atmospheric pressure. Glyoxylic Acid oligomerize when solution is concentrated and decomposes when heating at temperature above 150°C with loss of carbonic acid and water.