Diammonium oxalate

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

23 Oct - 06 Nov 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Type of method:

differential scanning calorimetry

Decomposition:

yes

Decomp. temp.:

123 °C

Remarks on result:

other: Individual test results : 123.45, 123.62, and 123.08 °C

Decomposition:

yes

Decomp. temp.:

238 °C

Remarks on result:

other: individual reslts: 236.5 °C; 238.1 °C; 239.8 °C

By differential scanning calorimetry 2 endothermic effects were determined:

1.) at 123 °C (endothermic range between 100 to 160 °C, determined in 3 independent measurements): with a weight loss of 13.6% (w/w) and no melting

2.) at 238 °C (endothermic range between 220 to 270 °C, determined in 3 independent measurements with 236.5 °C, 238.1 °C, 239.8 °C): complete or nearly complete weight loss.

These results were confirmed by a fourth test. By heating up to 160 °C the first endothermic effect was detected.

Then, after cooling down to 80 °C and heating up to 300°C, the 2nd endothermic effect was detected between 225 to 265 °C,

but there was no first endothermic effect.

In the capillary measurement test, following effects were detected: At 227 °C item starts to become discoloured, at 244 °C test

item turned to black, at 254 °C test item melted and boiled simultanously. At 260 °C substance became black.

Weight loss at 1st endothermic point corresponds to weight of water and can therefore be attributed to dehydration. 2nd endothermic point with complete or nearly complete weightloss is attributed to final decomposition.

Reference 2

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Guideline:

other: measured value

GLP compliance:

not specified

Decomposition:

yes

Decomp. temp.:

> 70 °C

Description of key information

At 123 °C, substance dehydration occurs and at 238 °C decomposition (OECD 102, DSC). Supporting data show decomposition >70 °C.