Disodium {sulfonylbis[4,1-phenylenediazene-2,1-diyl(1-ethyl-6-hydroxy-4-methyl-2-oxo-1,2-dihydropyridine-5,3-diyl)]}dimethanesulfonate

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experimental Starting Date: October 19, 2010 Experimental Completion Date: October 19, 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results. The study report was conclusive, done to a valid guideline and the study was conducted under GLP conditions.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

thermal analysis

Remarks:

Differential scanning calorimetry (DSC)

Test material

Test material information

Constituent 1

Reference substance name:

Acid Yellow RN 2903

IUPAC Name:

Acid Yellow RN 2903

Details on test material:

Identification: Acid Yellow RN 2903
Batch Number: Vers. Kilo 6, 26.05.2009
Purity: 65.7 %
Expiry Date: August 01, 2015
Storage Conditions: At room temperature at about 20 °C

Results and discussion

Melting / freezing point

Melting / freezing pt.:

K

Decomposition:

yes

Decomp. temp.:

323 °C

Sublimation:

no

Remarks on result:

other: No atmospheric pressure was recorded for this endpoint.

Any other information on results incl. tables

Preliminary Test

The DSC-curve of the preliminary test (heating rate of 20 °C/min from 25 °C to 400 °C) is shown in the attached Figure 1. An endothermic heat effect was observed starting at 57.3 °C and an exothermic heat effect was observed starting at 332.5 °C. After the experiment, the sample had lost about 29.7% of its mass and the sample was black and powdery.

 

 

Main Test

A further DSC-run was recorded between 25 °C and 400 °C with a heating rate of 10 °C/min. The DSC curve of the main test is given in the attached Figure 2. During this run, the endothermic heat effect started at 59.0 °C and the exothermic heat effect started at 323.3 °C. After the measurement, the test item lost about 30.8% of its mass and a black powder remained in the sample cup, indicating that the test item decomposed before melting occurred. The endothermic heat effect might be the result of emitting water or other volatile components.

 

Applicant's summary and conclusion

Conclusions:

Decomposition of Acid Yellow RN 2903 started at about 323 °C before melting occurred.

Executive summary:

Decomposition of Acid Yellow RN 2903 started at about 323 °C before melting occurred.