Disodium 4,4'-bis[[1-[[(2,4-dimethylphenyl)amino]carbonyl]-2-oxopropyl]azo][1,1'-biphenyl]-2,2'-disulphonate

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 12 April 2016 to 13 April 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

2009

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

2006

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

Version / remarks:

1996

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: isothermal thermogravimetry

Test material

Reference

Name:

Unnamed

Type:

Constituent

Test material form:

solid: particulate/powder

Details on test material:

- Appearance: yellow/brown powder
- Storage conditions: in refrigerator (2-8°C)

Specific details on test material used for the study:

reaction and/or decomposition at > 225°C

Results and discussion

Vapour pressure

Vapour pressure 1

Key result

Temp.:

25 °C

Vapour pressure:

< 0 Pa

Vapour pressure 2

Key result

Temp.:

20 °C

Vapour pressure:

< 0 Pa

Any other information on results incl. tables

From the start of the study untill ca. 150 minutes a weight loss was observed due to evaporation of impurities in the substance.

The log PT versus 1/T (T in K) curve for the substance over the range 170 -200°C showed poor linearity (correlation coefficient r < 0.99). Extrapolation of the curve to 20°C or 25°C would not give reliable results.

Since the weight losses of the test item at 170°C, 180°C, 190°C and 200°C were lower than the weight losses of chrysene at the same temperatures, it was concluded that the vapour pressure of the substance at 20°C (25°C) is lower than the vapour pressure of chrysene at 20°C (25°C).

Applicant's summary and conclusion

Conclusions:

The vapour pressure of the substance at 25°C was determined to be < 2.0E-06 Pa.
The vapour pressure of the substance at 20°C was determined to be < 8.4E-07 Pa.

Executive summary:

The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study according to EC A.4, OECD 104 and OPPTS 830.7950. The vapour pressure of the substance at 20°C (25°C) could not be determined by aid of a log pT vs 1/T curve. From the measured weight losses, the vapour pressure of the substance was concluded to be lower than the vapour pressure of reference substance Chrysene at 20°C (25°C). The vapour pressure of the substance at 25°C was determined to be < 2.0E-06 Pa. The vapour pressure of the substance at 20°C was determined to be < 8.4E-07 Pa.