2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-8-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, potassium sodium salt (1:?:?), coupled with diazotized 2-[(4-amino-5-methoxy-2-methylphenyl)sulfonyl]ethyl hydrogen sulfate

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Study completion date - 11 September 2003.

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:

no

Type of method:

other: Modified Watson Correlation

Specific details on test material used for the study:

Identity: FAT 40812/A
Batch: WP 8/03
Appearance: Solid, dark red-brownish powder
Expiration date: 23 April 2010
Storage: At room temperature at about 20 °C

Test no.:

#1

Temp.:

25 °C

Vapour pressure:

0 Pa

Remarks on result:

other: Sulphuric acid component

Test no.:

#2

Temp.:

25 °C

Vapour pressure:

0 Pa

Remarks on result:

other: Vinyl sulfon component

The boiling points of FAT 40812 were calculated to be about 751 °C for the first main component and about 755 °C for the second main component using Meissner's method. The vapour pressure of FAT 40812, acidic form of the molecule, was estimated to be 9.8E-25 Pa at 25 °C for the sulphuric acid ester component and 1.7E-24 Pa for the vinyl sulfon component.

Conclusions:

The vapour pressure of the two main components of the test substance were estimated to be 9.8E-25 Pa and 1.7E-24 Pa at 25 °C.

Executive summary:

In a study performed according to EC Method A.4, the vapour pressure of the test substance was determined by calculation. The test substance consists of two main components and for both the vapour pressure was calculated using the Modified Watson Correlation. This vapour pressure calculation was based on the calculated boiling point using the Meissner's method to be 9.8E-25 Pa and 1.7E-24 Pa at 25 °C for sulfuric acid and vinyl sulfon component, respectively.

Description of key information

In a study performed according to EC Method A.4, the vapour pressure of the test substance was determined by calculation. The test substance consists of two main components and for both the vapour pressure was calculated using the Modified Watson Correlation. The vapour pressure calculation was based on the calculated boiling point using the Meissner's method to be 9.8E-25 Pa and 1.7E-24 Pa at 25 °C for sulfuric acid and vinyl sulfon component, respectively.

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

20 °C