L-Glutamic acid, N-coco acyl derivs., compds. with triethanolamine (1:1)

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04 December 2017 to 06 December 2017

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

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: Knudsen cell

Key result

Temp.:

20 °C

Vapour pressure:

0.001 Pa

Key result

Temp.:

25 °C

Vapour pressure:

0.002 Pa

Key result

Temp.:

50 °C

Vapour pressure:

0.005 Pa

- The vapour pressure was measured in the temperature range of 30 to 100 °C. The measured vapour pressures at the corresponding temperatures are listed in Table 1. After the measurement a mass loss of approx. 6 % (w/w) was determined.

Table 1: Measured vapour pressures and corresponding temperatures

Temperature / °C	Vapour pressure / hPa
30	2.4 × 10^-5
40	2.8 × 10^-5
50	6.7 × 10^-5
60	6.6 × 10^-5
70	9.9 × 10^-5
80	1.6 × 10^-4
90	3.1 × 10^-4
100	4.0 × 10^-4

 

- The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C as shown in Table 2.

Table 2: Antoine parameters and extrapolated vapour pressures

T / °C	p / hPa	log (p/hPa) = A + B/(C+T[°C])
20	1.2 × 10^-5	A = 1.99970
25	1.6 × 10^-5	B = -2030.34
50	5.2 × 10^-5	C = 273.15

Table 3: Final Results

T / °C	p / hPa	p / Pa
20	1.2 × 10^-5	1.2 × 10^-3
25	1.6 × 10^-5	1.6 × 10^-3
50	5.2 × 10^-5	5.2 × 10^-3

Conclusions:

Under the conditions of this study, the vapour pressure of the test material was 1.2 x 10^-3 Pa, 1.6 x 10^-3 Pa and 5.2 x 10^-3 Pa at 20, 25 and 50 °C, respectively.

Executive summary:

The vapour pressure of the test material was investigated in accordance with the standardised guidelines OECD 104 and EU Method A.4, under GLP conditions.

The vapour pressure was examined using the effusion method with the Knudsen cell. The vapour pressure was measured in the temperature range of 30 °C to 100 °C.

After the measurement a mass loss of approx. 6 % (w/w) was determined. The values for 20, 25 and 50 °C were calculated, using the Antoine constants A, B and C.

Under the conditions of this study, the vapour pressure of the test material was 1.2 x 10^-3 Pa, 1.6 x 10^-3 Pa and 5.2 x 10^-3 Pa at 20, 25 and 50 °C, respectively.

Description of key information

Under the conditions of this study, the vapour pressure of the test material was 1.2 x 10^-3 Pa, 1.6 x 10^-3 Pa and 5.2 x 10^-3 Pa at 20, 25 and 50 °C, respectively.

Key value for chemical safety assessment

Vapour pressure:

0.002 Pa

at the temperature of:

25 °C

Additional information

The vapour pressure of the test material was investigated in accordance with the standardised guidelines OECD 104 and EU Method A.4, under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The vapour pressure was examined using the effusion method with the Knudsen cell. The vapour pressure was measured in the temperature range of 30 °C to 100 °C.

After the measurement a mass loss of approx. 6 % (w/w) was determined. The values for 20, 25 and 50 °C were calculated, using the Antoine constants A, B and C.

Under the conditions of this study, the vapour pressure of the test material was 1.2 x 10^-3 Pa, 1.6 x 10^-3 Pa and 5.2 x 10^-3 Pa at 20, 25 and 50 °C, respectively.