L-2-hydroxy-2-phenylacetic acid

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2001

Report date:

2001

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

GLP compliance:

no

Type of method:

gas saturation method

Test material

Test material information

Constituent 1

Reference substance name:

L-2-hydroxy-2-phenylacetic acid

EC Number:

210-276-6

EC Name:

L-2-hydroxy-2-phenylacetic acid

Cas Number:

611-71-2

Molecular formula:

C8H8O3

IUPAC Name:

hydroxy(phenyl)acetic acid

Test material form:

other: solid

Details on test material:

Name of test material (as cited in study report): (R)-(-)-mandelic acid
Analytical purity: > 99.5%

Results and discussion

Vapour pressure

Vapour pressure 1

Temp.:

20 °C

Vapour pressure:

0 hPa

Remarks on result:

other: calculated from the regression equation

Vapour pressure 2

Temp.:

25 °C

Vapour pressure:

0 hPa

Remarks on result:

other: calculated from the regression equation

Vapour pressure 3

Temp.:

50 °C

Vapour pressure:

0 hPa

Remarks on result:

other: calculated from the regression equation

Any other information on results incl. tables

Results:

Temperature [°C]	Vapour pressure (exp.) [hPa]	Vapour pressure (calc.) [hPa]	Aberration [%]
69.6	0.000995	0.001292	-29.84
69.8	0.00181	0.001329	26.59
82.7	0.00687	0.007593	-10.52
93.8	0.0297	0.03084	-3.84
94.1	0.0350	0.03199	8.59

The regression of the results leads with a mean deviation of < 20 % to the following equation:

ln(p/hPa) = 34.5492 - 16489.22 / (273.15 + t/°C)

The vapour pressure at 20 °C, 25 °C and 50°C was calculated from the regression equation.