Naphthenic acids, copper salts

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2018-05-17 to 2018-07-17

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Version / remarks:

2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2017-02-28

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Storage Conditions: -15 °C to 40 °C

Atm. press.:

>= 1 004 - <= 1 017 hPa

Decomposition:

yes

Decomp. temp.:

>= 230 °C

Melting and Boiling Point (DSC) and Capillary method

The DSC runs PN15746 and PN15747 in open glass crucibles showed following results:

Results of the DSC-measurements

No.	Sample weight [mg]	Onset of Effect [°C]	Range of effect [°C]	Weight loss	Atmospheric pressure [hPa]
PN15746	18.32	-37.2 213.6 269.9 ---	-40 to -20 (endo) 190 – 260 (endo) 260 – 310 (endo) 310 – 600 (exo)	12.21 mg / 67 %	1017
PN15747	14.26	-31.4 209 .8 257.1 ---	-30 to -10 (endo) 190 – 240 (endo) 250 – 290 (endo) 290 – 570 (exo)	9.00 mg / 63 %	1017

During the cooling phase, no thermal effects were observed, which can be assigned to the freezing of the test item.

During the heating phase a very small endothermic effect was observed in the temperature range of -40 to -10 °C, which can be assigned to the melting of the test item.

The test item showed an endothermic signal in the temperature range of 190 °C to 260 °C and in the temperature range of 250 °C to 310 °C, directly followed by an exothermic effect in the temperature range of 290 °C – 600 °C with an energy* of -340 J/g and -580 J/g, respectively. In view of the fact that the measured weight loss of each sample was only between 63 % and 67 % of the respective initial sample weight, none of the observed endothermic effects can be assigned to boiling of copper naphthenate.

*Negative energy for exothermic processes, positive energy for endothermic processes

Measurements by the capillary method

For verification of the results the test item was additionally tested with the capillary method. At 226 °C gas formation was observed. The measurement was stopped at 230 °C with a brown to orange residue remaining in the capillary. Therefore, the test item decomposes at approx. 230 °C.

Conclusions:

Boiling Point
No definitive signs of boiling of the test item copper naphthenate were observed by differential scanning calorimetry (DSC) and by the capillary method up to the decomposition, beginning at 230 °C. The measurements were performed according to Regulation (EC) No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995) at atmospheric pressure (1004 – 1017 hPa).

Description of key information

No definitive signs of boiling of the test item copper naphthenate were observed by differential scanning calorimetry (DSC) and by the capillary method up to the decomposition, beginning at 230 °C. The measurements were performed according to Regulation (EC) No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995) at atmospheric pressure (1004 – 1017 hPa).