C.I. Solvent Red 119

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

May 2017 - December 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2020

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: isothermal thermogravimetry

Test material

Test material information

Constituent 1

Reference substance name:

C.I. Solvent Red 119

EC Number:

602-676-8

Cas Number:

12237-27-3

Molecular formula:

C32H22N10O8Cr

IUPAC Name:

C.I. Solvent Red 119

impurity 1

Reference substance name:

Unknown impurities

Cas Number:

not available

IUPAC Name:

Unknown impurities

impurity 2

Reference substance name:

Water

EC Number:

231-791-2

EC Name:

Water

Cas Number:

7732-18-5

Molecular formula:

H2O

IUPAC Name:

water

Test material form:

solid: particulate/powder

Results and discussion

Vapour pressure

Key result

Temp.:

20 °C

Vapour pressure:

0 Pa

Applicant's summary and conclusion

Conclusions:

The isothermal thermogravimetric effusion method was applied for the determination of the vapour pressure of Solvent Red 119.
A value of the vapour pressure of the test item was determined using the data obtained between 210 °C and 260 °C.
The vapour pressure of the test item was calculated (mean of three de-terminations) to: 6.17 × 10-7 Pa at 20 °C.

This value however is expected to be overestimated, because it was de-termined from the molten material.

Executive summary:

According to ibacon Study 126021180 the melting range of the test item is 226.0 °C to 227.7 °C. The evaluation of the vapour pressure was done with the reproducible weight loss values above 230 °C, it´s means above the melting range.

The corresponding weight loss curve is shown in Appendix I, Figure 1.

The results of the isothermal TGA analysis are given in Appendix I, Table 2.

Appendix I, Figure 2 shows the plot of log V_Tof the test item as function of the reciprocal temperatures. The coefficient of correlation (R²) was 0.9940.

The regression line of log P_Tas a function of log V_Tused for calibration is given in Appendix I, Figure 3. The coefficient of correlation (R²) was 0.9945. The resulting equation was:

 

 

Inserting the equation for log V_Tabove, the following equation for the temperature dependence of the vapour pressure of the test item is obtained:

 

(where: a = -4.6270, b = 6.0928 C = 4.7300 and D = 1.1279)

 

With this equation, a following vapour pressure results were obtained:

6.17 × 10^-7Pa at 20 °C.