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Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Not reported
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
>= -25 - <= -23 °C

Table1: Melting point (DSC measurements)

Ident No.

Test item /

mg

Starting temperature /

°C

Final test temperature /

°C

Temperature range (endo-thermal) /

°C

Onset (melting) / °C

Crucible

Observations after the measurement

36378

17.04

-50

50

-30 to 0 °C

-23.1

Aluminium with a hole

Test item seemed unchanged; mass loss: 0 %

36383

13.33

-50

50

-30 to +5 °C

-24.4

Aluminium with a hole

Test item seemed unchanged; mass loss: 0 %
Conclusions:
The test item had a melting range of -25 to -23°C.
Executive summary:

Nau (2017) is a GLP-compliant report following EU method A.1. and OECD guideline 102, using differential scanning calorimetry. The study is considered to be reliable without restrictions (Klimisch 1). The test item had a melting range of -25 to -23°C.

Description of key information

Dirhodium trisulphate (solution) had a melting range of -25 to -23°C.

Dirhodium trisulphate (solid) has a melting temperature >500°C, but decomposition occurs before melting.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-25 °C

Additional information

For dirhodium trisulphate (solution), Nau (2017) is a GLP-compliant report following EU method A.1. and OECD guideline 102, using differential scanning calorimetry. The study is considered to be reliable without restrictions (Klimisch 1). Dirhodium trisulphate (solution) has a melting range of -25°C to -23°C.

For dirhodium trisulphate (solid), Lide (2008) is used as key reference. Dirhodium trisulphate (solid) has a melting temperature >500°C, but decomposes before melting.