Lanthanum trinitrate

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Well defined expert statement based on results of a preliminary DSC experiment.

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:

Lanthanum trinitrate

EC Number:

233-238-0

EC Name:

Lanthanum trinitrate

Cas Number:

10099-59-9

Molecular formula:

H3LaN3O9+3

IUPAC Name:

lanthanum trinitrate

Results and discussion

Any other information on results incl. tables

Argumentation:

During the DSC experiment run in the context of study No. 11-918025-023, 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 -50°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 70.1°C. A main test was then carried out using a heating procedure from 25°C to 300°C at 10°C/min. During this assay an endothermic peak was observed at 69.7°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 lanthanum 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 lanthanum trinitrate did not melt or boil over the temperature range tested. These results confirmed that the vapour pressure of lanthanum 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 lanthanum 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.