Praseodymium trinitrate

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

other: Statement

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: The statement was prepared based on the results of the DSC study performed to investigate the melting/boiling behaviours in accordance with the REACH Regulation (Column 2 of Annex VII; point 7.5).

Cross-reference

Reason / purpose for cross-reference:

reference to same study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Principles of method if other than guideline:

Expert statement

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Praseodymium trinitrate

EC Number:

233-796-5

EC Name:

Praseodymium trinitrate

Cas Number:

10361-80-5

Molecular formula:

HNO3.1/3Pr

IUPAC Name:

praseodymium trinitrate

Results and discussion

Any other information on results incl. tables

Argumentation:

During the DSC experiment run in the context of study No. 11-918025-13, a preliminary heating procedure at 10°C/min was conducted from -60°C to 600°C. This preliminary test was decomposed in two assays; the first between -60°C and 50°C, and the second between 25°C and 600°C. The first assay did not reveal any endothermic or exothermic events. During the second assay, an endothermic peak was observed at 88.2°C. A main test was then carried out using a heating procedure from 25°C to 300°C at 10°C/min, and was decomposed in three assays all using the same heating ramp. This set of assays also revealed an endothermic peak with a mean value determined at 83.2°C.

These endothermic events reflected the fact that the rare earth salt solubilised in its hydration water. Indeed, the hydrated rare earth salts, such as the hydrated form of praseodymium trinitrate, loose their water of hydration when heated. As these water molecules are loosely bound and as the amount of water in the substance is significant, the attached water is released and the rare earth salt solubilizes in water. As a result, it is concluded that praseodymium trinitrate did not melt or boil over the temperature range tested. These results confirmed that the vapour pressure of praseodymium trinitrate can be considered as negligible.

Applicant's summary and conclusion

Conclusions:

The results of a preliminary DSC experiment confirmed that the vapour pressure of praseodymium trinitrate could be considered as negligible. In accordance with column 2 of REACH Annex VII, it is thus not required to perform a complete vapour pressure test.