Ethyl [2-(4-phenoxyphenoxy)ethyl]carbamate

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

13 Nov 1991 to 18 Apr 1992

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

Type of method:

gas saturation method

Key result

Temp.:

25 °C

Vapour pressure:

0 Pa

Remarks on result:

other:

Remarks:

The value is extrapolated from measurements between 75.5 °C and 155.6 °C.

RESULTS

REFERENCE COMPOUND ANTHRACENE

Vapour pressure curve

10Log P (Pa) = 13.6956 – 4944.43 x 1/T(K)

from fit of measurements between 32.3 °C and 176.1 °C

Vapour Pressure at 25 °C: 1.294E-03 Pa (extrapolated)

 

REFERENCE COMPOUND HEXACHLOROBENZENE

Vapour pressure curve

10Log P (Pa) = 14.5019 - 5111.48 x 1/T(K)

from fit of measurements between 32.4 °C and 180.0 °C

Vapour Pressure at 25 °C: 2.228E-03 Pa (extrapolated)

 

PHASE TRANSITIONS OF TEST COMPOUND

- no phase transition within temperature region measured

- indicate melting point, if within or close to temperature region of the vapour pressure measurement: melting Point = 53.2 °C

 

VAPOUR PRESSURE RESULTS

A)   Liquid phase : Main experiment (9.8769 mL/min)

Vapour pressure curve

10Log P (Pa) = 16.1937 - 6505.41 x 1/T(K)

from fit of measurements between 75.5 °C and 155.6 °C

Vapour Pressure at 25 °C: 2.37E-06 Pa (extrapolated)

Amorphous state as compound not a liquid at room temperature.

 

B. Liquid phase: Saturation control (0.1802 mL/min)

Vapour pressure curve

10Log P (Pa) =12.9303 – 5416.94 x 1/T (K)

from fit of measurements between 120.7 °C and 150.5 °C

Vapour Pressure at 25 °C: 5.78E-06 Pa (extrapolated)

Amorphous state as compound not a liquid at room temperature.

 

C) Enthalpy of fusion

From difference of enthalpies of evaporation = δhf = δhs – δhv

δhf = XX.X ± X kJ/mol

From DSC measurement: δh= 28.80 kJ/mol

Note:

enthalpy of sublim. resp. evap. δh (kJ/mol) = 0.019144 x B

entropy of sublim. resp. evap. δs (J/mol) = 19.144 x A

 

Fill in, if the Vapour Pressure Curve reported in the summary was obtained by

calculation over a phase change:

10Log P(Pa) = A + B x 1/T(K)

A_sol= A_liq + [δ hf (kJ/mol) /00.019144 ] / (273.15 + MP °C)

A_sol = 16.1937 + [28.80 / 0.019144 ] / (273.15 + 53.2 °C)

A_sol = 20.8030

 

B_sol= B_liq - [δ hf (kJ/mol) /00.019144 ]

B_sol = -6505.41 - 28.80 / 0.01944

B_sol = -8009.80

 

D) Measured vapour pressures

All of the selected good vapour pressure measurement points and temperatures are indicated in the included vapour pressure report. This report contains also the calibration equation and plot used for the evaluation of the raw data. Included are furthermore the vapour pressure plot and calculated (inter-and extrapolated) vapour pressures for a number of fixed temperatures.

 

PROBLEMS ENCOUNTERED DURING THE PRESENT MEASUREMENTS

Problems encountered: Low vapour pressure, solid phase not directly accessible. The difference between high and low saturation flow curves is due to a very nonlinear calibration curve, but has no adverse effects on the quality of the main results.

Conclusions:

The vapour pressure at 25 °C was found by extrapolation and revealed to be 8.67E-07 Pa.

Executive summary:

The vapour pressure of the test substance was determined by the automatised gas saturation method in accordance with the OECD TG 104 and EU Method A.4 and was in compliance with GLP. The vapour pressure of the test substance at 25 °C by determined by extrapolation was 8.67E-07 Pa, corresponding with 6.503E-09 mm Hg (extrapolated) (1 Pa = 7.500617E-03 mm Hg).

Description of key information

8.67E-07 Pa at 25 °C. OECD TG 104, GC saturation method, Rordorf 1992.

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

25 °C