Sodium 2-butoxyethyl sulphate

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

06 Jul - 06 Sep 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

2006

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

Version / remarks:

1996

GLP compliance:

not specified

Type of method:

effusion method: vapour pressure balance

Key result

Temp.:

20 °C

Vapour pressure:

< 0.001 Pa

Temp.:

25 °C

Vapour pressure:

< 0.001 Pa

Temp.:

50 °C

Vapour pressure:

< 0.001 Pa

Transition / decomposition:

yes

Transition temp.:

>= 190 °C

Thermal Stability

In the temperature range of 110 °C - 170 °C, an endothermic effect was observed. An exothermic effect was detected in the temperature range of 190 - 260 °C, with a decomposition energy of -160 J/g. The exothermic effect was directly followed by a second endothermic effect in the temperature range of 260 - 270 °C. The test was terminated at 300 °C. The results are summarized in the following table.

 

Sample weight / mg	Start / °C	Energy / J/g
7.25	110 (endothermic) 190 (exothermic) 260 (endothermic)	+60 -160 +20

 

 

Effusion method: Knudsen cell

The vapour pressure was measured in the temperature range of 81 to 111 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.

 

No.	Temperature / °C	Vapour pressure / Pa
1	80.8	1.26x10^-3
2	91.0	6.14x10^-4
3	101.0	7.48x10^-4
4	111.0	6.59x10^-4

 

Since no evaluable vapour pressure curve could be determined using the Knudsen cell method a further measurement was carried out using the vapour pressure balance.

 

 

Effusion method: Vapour pressure balance

The measurement was performed in the temperature range of 28 to 168 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.

 

No.	Temperature / °C	Vapour pressure / Pa
1	28	5.19x10^-4
2	38	5.26x10^-4
3	58	5.98x10^-4
4	78	7.75x10^-4
5	98	1.02x10^-3
6	108	9.09x10^-4
7	118	8.75x10^-4
8	138	1.39x10^-3
9	143	1.27x10^-3
10	148	1.36x10^-3
11	153	1.85x10^-3
12	158	2.75x10^-3
13	163	8.27x10^-3
14	168	1.97x10^-2

 

In the investigated temperature range from 28 to 168 °C no evaluable vapour pressure curve could be detected. Due to fact that the test item starts to decompose at a temperature of approx. 190 °C, the measurement was aborted.

 

Final Results

The test item showed no evaluable vapour pressure curve in the temperature range of 28 to 168 °C. Due to this result, the Antoine constant cannot be evaluated and the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the measured vapour pressures in the temperature range of 28 - 58 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006).

 

Temperature / °C	Vapour pressure / Pa
20	<10^-3
25	<10^-3
50	<10^-3

Description of key information

Vapour pressure: < 0.001 Pa at 20 °C, 25 °C and 50 °C (OECD Guideline 104, effusion method: vapour pressure balance)

Additional information

The test item showed no evaluable vapour pressure curve in the temperature range of 28 to 168 °C. Due to this result, the Antoine constant cannot be evaluated and the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the measured vapour pressures in the temperature range of 28 - 58 °C (5.19E-4 - 5.98E-4 Pa), according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006).