Gadoliniumsulfite trihydrate

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

other: Experimental results und expert judgement

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference

Reference Type:

other company data

Title:

Unnamed

Year:

2002

Report date:

2002

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Thermogravimetric analysis or thermal gravimetric analysis (TGA) is a method of thermal analysis in which changes in physical and chemical properties of materials are measured as a function of increasing temperature (with constant heating rate), or as a function of time (with constant temperature and/or constant mass loss). TGA can provide information about physical phenomena, such as second-order phase transitions, including vaporization, sublimation, absorption and desorption. Likewise, TGA can provide information about chemical phenomena including chemisorptions, desolvation (especially dehydration), decomposition, and solid-gas reactions (e.g., oxidation or reduction).

GLP compliance:

not specified

Type of method:

other: thermogravimetric analysis

Test material

Test material information

Constituent 1

Reference substance name:

Gadoliniumsulfite trihydrate

EC Number:

456-900-2

EC Name:

Gadoliniumsulfite trihydrate

Cas Number:

51285-81-5

Molecular formula:

Gd2(SO3)3*3H2O

IUPAC Name:

digadolinium(3+) trihydrate trisulfite

Test material form:

solid: particulate/powder

Details on test material:

Off white, crystalline powder
Batch number FSG 3896 or 02-FW-095

Results and discussion

Melting / freezing point

Key result

Melting / freezing pt.:

> 400 °C

Decomposition:

yes

Decomp. temp.:

> 400 °C

Applicant's summary and conclusion

Conclusions:

Between 100°C and 400°C the elimination of three mol water of crystallization and from 400°C the slow decomposition of gadoliniumsulfite trihydrate could be observed. A melting point or range could not be determined for gadoliniumsulfite trihydrate.

Executive summary:

The result of the thermogravimetric analysis: Between 100°C and 400°C the elimination of three mol water of crystallization could be observed. From 400°C the slow decomposition of gadoliniumsulfite trihydrate, with the supposed formation of Gadolinium oxide and sulfur dioxide, was observed. A melting point or range could not be determined for gadoliniumsulfite trihydrate.