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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:
12 October 2018 to 22 October 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: vapour pressure balance
Specific details on test material used for the study:
Test item: Acid Orange 94 Refined
Alternative name: Disodium 5, 5’-[(1-methylethylidene)bis(4,1-phenyleneoxysulphonyl-2,1-phenyleneazo)]bis[6-aminonaphthalene-1-sulphonate]
CAS number: 70161-18-1
EC number: 274-354-1
Intended use: Industrial chemical
Appearance: Reddish brown crystals
Storage conditions: Room temperature (10 – 30C), in the dark
Lot number: 8009
Expiry/Retest date: 31 December 2019
Purity: 97%
Key result
Temp.:
25 °C
Vapour pressure:
5.1 Pa

The test item did not change in appearance under the conditions used in the determination.

No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapor pressure at 25 ºC.

Run 10 was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 189 ºC (462.15 K) was chosen because this is the data point which gives the highest estimated vapor pressure at any given temperature when a slope of –1000 K is imposed upon it.

The value of –1000 K is an in-house value and is the shallowest slope observed whilst determining the vapor pressure on a wide range of samples using the vapor pressure balance method. Extrapolation to 25 ºC gave a vapor pressure of 5.03 x 10-3 Pa which has been taken as a maximum for this material.

Conclusions:
The vapor pressure of the test item has been determined to be less than 5.1 x 10-3 Pa at 25 ºC.
Executive summary:

The vapor pressure was determined using the vapor pressure balance method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 (as amended) of 30 May 2008, and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006, in accordance with GLP.

The vapor p ressure of the test item has been determined to be less than 5.1 x 10-3 Pa at 25 ºC.

Description of key information

The vapor pressure was determined using the vapor pressure balance method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 (as amended) of 30 May 2008, and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006, in accordance with GLP.

The vapor p ressure of the test item has been determined to be less than 5.1 x 10-3 Pa at 25 ºC.

Key value for chemical safety assessment

Vapour pressure:
5.1 Pa
at the temperature of:
25 °C

Additional information