Selenium disulphide

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

December 20, 2017 to December 21, 2017

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:

yes (incl. QA statement)

Type of method:

effusion method: isothermal thermogravimetry

Specific details on test material used for the study:

Name: Selenium Disulphide
Batch No.: PMC / 285 / 16
CAS No.: 7488-56-4
Certificate of Analysis Date: January 23, 2017
Aggregate State at Room Temperature: Solid
Colour: Orange/yellow
Assay: 100% w/w UVCB material
Retest Date: November 24, 2019
Storage Conditions at Test Facility: At 20 °C ± 5 °C, in the dark

Key result

Temp.:

20 °C

Vapour pressure:

0.001 Pa

The evaluation of the vapour pressure was done with the reproducible weight loss values above ≥ 1 µg/min and with the results above 120 °C.

The plot of log V_T of the test item as function of the reciprocal temperatures. The coefficient of correlation (R²) was 0.9975.

The regression line of log P_T as a function of log V_T used for calibration. 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:

  Log P_T= C + D (a x *1000/T) + B) = C + (D x b) + (D x a x 1000)/T

(where: a = -3.8889, b = 6.1825, C = 4.7300 and D = 1.1279)

 

With this equation, a following vapour pressure results were obtained: 5.41 × 10^-4Pa at 20 °C.

Remarks:       In the case of the Selenium Disulphide it should be taken into consideration, that the test item is 100% UVCB material

Conclusions:

The isothermal thermogravimetric effusion method was applied for the determination of the vapour pressure of Selenium Disulphide.
A value of the vapour pressure of the test item was determined using the data obtained between 110 °C and 170 °C.
The vapour pressure of the test item was calculated (mean of three determinations) to: 5.41 × 10-4 Pa at 20 °C.

Executive summary:

The purpose of the study was to determine the vapour pressure of the test item using the isothermal thermogravimetric effusion method. The evaporation rates of the test item at elevated temperatures and ambient pressure were determined by monitoring the weight loss over the time.

This study was based on the procedures indicated by the following internationally accepted methods and was conducted in a GLP compliant laboratory:

- European Community (EC), EC No. 761/2009, Part A: Methods for the Determination of Physico-Chemical Properties, Guide-line A.4: “Vapour Pressure”, Official Journal of the European Union No. L220, August 24, 2009

- Organisation for Economic Co-operation and Development (OECD), OECD Guidelines for the Testing of Chemicals No. 104: “Vapour Pressure”, March 23, 2006

A value of the vapour pressure of the test item was determined using the data obtained between 110 °C and 170 °C. The vapour pressure of the test item was calculated (with the mean of three replicates) to: 5.41 × 10-4 Pa at 20 °C.

Description of key information

Key value determined in a GLP accredited laboratory study using thermogravimetric effusion method in accordance with:

-       European Community (EC), EC No. 761/2009, Part A: Methods for the Determination of Physico-Chemical Properties, Guideline A.4: “Vapour Pressure”, Official Journal of the European Union No. L220, August 24, 2009

-       Guidelines for the Testing of Chemicals No. 104: “Vapour Pressure”, March 23, 2006

Key value for chemical safety assessment

Vapour pressure:

0.001 Pa

at the temperature of:

20 °C

Additional information

The purpose of the study was to determine the vapour pressure of the test item using the isothermal thermogravimetric effusion method. The evaporation rates of the test item at elevated temperatures and ambient pressure were determined by monitoring the weight loss over the time.

This study was based on the procedures indicated by the following internationally accepted methods and was conducted in a GLP compliant laboratory:

- European Community (EC), EC No. 761/2009, Part A: Methods for the Determination of Physico-Chemical Properties, Guide-line A.4: “Vapour Pressure”, Official Journal of the European Union No. L220, August 24, 2009

- Organisation for Economic Co-operation and Development (OECD), OECD Guidelines for the Testing of Chemicals No. 104: “Vapour Pressure”, March 23, 2006

A value of the vapour pressure of the test item was determined using the data obtained between 110 °C and 170 °C. The vapour pressure of the test item was calculated (with the mean of three replicates) to: 5.41 × 10-4 Pa at 20 °C.