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Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
04 October 2016 to 05 October 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
Remarks on result:
not determinable
Remarks:
No boiling point was determined as the test item decomposed before boiling occurred.

A first DSC measurement with a heating rate of 10 K/min and a final test temperature of 500 °C showed several endothermic effects in the temperature ranges of 70 ‑ 110 °C, 120 ‑ 160 and 180 ‑ 225 °C. After the measurement a black residue was observed and the mass loss amounted to 66 %.

A second DSC measurement with a heating rate of 10 K/min and a final test temperature of 200 °C showed two endothermal effects in the temperature ranges of 75 – 110 °C and120 – 160 °C. After the measurement the test item showed no signs of melting and a mass loss of 8 % was observed.

In a further DSC measurements the test item was heated up to 180 °C with a heating rate of 10 K/min, cooled down to 25 °C with a cooling rate of 10 K/min and afterwards the test item was heated up to 180 °C with a heating rate of 10 K/min. The measurement showedtwo endothermal effects during the first heating up in the temperature ranges of 75 – 110 °C and 115 – 170 °C. No further endothermal or exothermal effects were observed in the cooling down or the second heating up. After the measurement the test item showed no signs of melting and a mass loss of 9 % was observed.

Table1: Melting point (DSC measurements)

Ident No.

Test item /

mg

Starting temperature /

°C

Final test temperature /

°C

Temperature range /

°C

Onset /

°C

Crucible

Observations after the measurement

35860

10.57

25

500

70 – 110

120 – 160

180 - 225

-

-

-

Aluminium with a hole

Black residue, mass loss: 66 %

35861

19.11

25

200

75 – 110

120 – 170

-

-

Aluminium with a hole

Test item showed no signs of melting, mass loss: 8 %

35862

15.31

see above

see above

70 – 1101)

115 – 1701)

-

-

Aluminium with a hole

Test item showed no signs of melting,

mass loss: 9 %

1)Endothermal effects were only observed in the first heating up phase.

Conclusions:
The test item had no boiling point at atmospheric conditions as decomposition started before boiling occured.
Executive summary:

This is a GLP compliant study following OECD guideline 103 and EC method A.2 and is considered suitable for use as the key study for this endpoint. The boiling point / boiling range were assessed by differential scanning calorimetry (DSC).

The test item had no boiling point at atmospheric conditions. Decomposition started before boiling occured.

Description of key information

The test item had no boiling point at atmospheric conditions as decomposition started before boiling occurred.

Key value for chemical safety assessment

Additional information

The boiling point of tetraaminepalladium (II) acetate was assessed in a GLP compliant study following OECD guideline 103 and EC method A.2 (Winkler 2016). The boiling point / boiling range were assessed by differential scanning calorimetry (DSC). This is a GLP-compliant, guideline study and is considered suitable for use as the key study for this endpoint.

 

The test item decomposed before boiling occurred and therefore no boiling point could be determined.