Zinc EDDHA

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

01 MAR 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

no

Type of method:

differential scanning calorimetry

Decomposition:

yes

Decomp. temp.:

>= 55.37 - <= 194.77 °C

Remarks on result:

not determinable

Pre-test for melting point

The following observations were recorded:

From 60 °C: The test substance was slightly shrivelled with condensate

From 250 °C: The colour was darker and getting darker

Up to 360 °C: The test substance was brown, no signs of melting were ob-served, decomposition was considered.

After cooling down: The test substance stayed as a brown compacted solid

Selected temperature was 360 °C, the capillary tube containing the test substance was set into channel 2 of the instrument at 25.1 °C

In the additionally pre-test on a magnesia groove with the gas burner, the test substance shrivelled, charred and glowed.

Security Pre-test for the DSC instrument

The lid of the crucible was bloated after reaching a temperature of 600 °C. The weight was recorded with 33.67 mg.

Calibration

The measurement of indium after calibration met the validity criteria.

Observations

	Mass test item	Mass crucible (before measurement):	Mass crucible (after measurement):	Observations
First Measurement	1.61 mg	33.90 mg	33.41	After the test the crucible was bloated. The crucible was opened, the test substance stayed as a black powder, decomposition was considered.
Second Measurement	1.63 mg	34.12 mg	33.62	After the test the crucible was bloated.

Interpretation of the measurements

Two DSC measurements were performed.

In both measurements, an unsteady baseline between 55.37 °C and 194.77 °C was detected.

The unsteady baseline could be indicative of decomposition, as the condensate was visi-ble in the pre-test and the test substance had shrivelled slightly, as had the colour change.

Therefore, no melting point can be given under these test circumstances as the test sub-stance has decomposed.

The decomposition process is given in the range of 55.37 °C - 194.77 °C.

Assessment

The DSC measurement of indium after calibration met the validity criteria.

Therefore, the result of the study is considered valid.

FINAL RESULT

The determination of the melting point of Zinc-EDDHA sodium salts was performed via DSC (differential scanning calorimetry.

Based on the observation in the pre-test the decomposition process is given in the range of 55.37 °C – 194.77 °C.

The measurement of indium after calibration met the validity criteria. Therefore, the result of the study is considered valid.

Conclusions:

Based on the observation in the pre-test the decomposition process is given in the range of 55.37 °C – 194.77 °C.

Executive summary:

The determination of the melting point of the test item was performed via DSC (differential scanning calorimetry) according to OECD Guideline 102 and EU Method A.1.

Based on the observation in the pre-test the decomposition process is given in the range of 55.37 °C – 194.77 °C. No melting was observed.

Description of key information

The determination of the melting point of the test item was performed via DSC (differential scanning calorimetry) according to OECD Guideline 102 and EU Method A.1.

Based on the observation in the pre-test the decomposition process is given in the range of 55.37 °C – 194.77 °C. No melting was observed.