Palladium dinitrate

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

09 September 2016 to 12 September 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Decomposition:

yes

Decomp. temp.:

ca. 70 °C

Remarks on result:

not determinable

The DSC measurement in an aluminium crucible with a hole showed an exothermal effect starting at approx. 70 °C. In the temperature range of 100 – 170 °C a multistage endothermal effect was observed. After the measurement, the test item was discoloured to black. The mass loss after the DSC measurement amounted to 51 %.

An additional measurement with the capillary method was performed in order to clarify the results. Ahigh heating rate of 10 K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results.Under consideration of the results from the DSC measurement and the capillary method it was concluded that the test item had no melting point at atmospheric conditions

Table1: DSC measurements

No.	Test item / mg	Starting temperature / °C	Final test temperature / °C	Temperature range / °C	Crucible	Observations after the measurement
1	14.56	25	500	70 – 100 (exothermal) 100 – 170 (endothermal, multistage)	Aluminium with a hole	Test item was black after the measurement; mass loss: 51 %

Table2: Results of the capillary method

No.	Set point / °C	Heating rate / K/min	End point / °C	Remarks
1	60	10	220	Approx. 88 °C:    test item became darker Approx. 101 °C:  test item started to melt Approx. 120 °C:  test item discoloured to grey-brown Approx. 133 °C:  test item discoloured to black Approx. 142 °C:  test item was partly melted, formation of bubbles Approx. 150 °C:  formation of condensate at the cold top of the capillary Approx. 173 °C:  test item not completely melted, appeared like a black residue Approx. 220 °C:  no further effect observed

Conclusions:

The test item had no boiling point at atmospheric conditions. Decomposition started at approximately 70 °C.

Executive summary:

This is a GLP compliant study following OECD guideline 103 and is considered suitable for use as the key study for this endpoint. The boiling point / boiling range were determined by differential scanning calorimetry (DSC) and capillary tube in a metal block.

The test item had no boiling point at atmospheric conditions. Decomposition started at approximately 70 °C.

Description of key information

The test item had no boiling point at atmospheric conditions. Decomposition started at approximately 70°C.

Additional information

A GLP study following OECD guideline 103 was performed to determine boiling point of palladium dinitrate (Nau 2016). It was concluded that the test item had no boiling point at atmospheric conditions as decomposition started at approximately 70°C.