2-ethylhexanoic acid, iron salt

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2018-05-04 to 2018-09-19

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.:

>= 120 °C

         

Melting and Boiling Point (DSC)

Six endothermic effects were detected in the temperature ranges of -10 °C to 10 °C (melting of water (impurity)), 60 °C – 180 °C (decomposition under boiling) and 190 °C – 280 °C, 380 °C – 450 °C, 450 °C – 500 °C and 500 °C – 590 °C (possible phase transition, decomposition). 

Results of the DSC-measurements

No.	Sample weight / mg	Onset of Effect / °C	Range of effect / °C	Weight loss / mg	Atmospheric pressure / hPa
PN15771	10.02	-1.73 147.52 231.83 398.21 454.42 508.76	-10 to 10 (endo) 60 – 170 (endo) 200 – 280 (endo) 380 – 450 (endo) 450 – 490 (endo) 500 – 570 (endo)	8.07 81 %	1000.0
PN15794	8.01	-4.37 151.12 212.26 405.01 475.16 510.67	-10 to 10 (endo) 90 – 180 (endo) 190 – 280 (endo) 380 – 450 (endo) 460 – 500 (endo) 500 – 590 (endo)	6.29 79 %	999.2

It is not possible to assign any of the observed endothermic effects definitely to a melting of the test item.

There is no boiling of the test item observed. However, a mass loss of approx. 80 % was observed during measurement. This may due to the decomposition and boiling of decomposition products of 2-ethylhexanoate. The iron decomposition products are still remain as residue in the test crucible.

Measurements by the Test Tube

For verification of the DSC resultsthe test item was additionally tested in a test tube.In the temperature range of -80 to approx. -60 °C the test item was solid. The appearance of the test item during warming up was between -50 °C and -15 °C very stringy mass and at 25 °C black viscous liquid. The test item shows a softening in the temperature range of approx. -55 °C to -50 °C.

Measurements by the Capillary Method

For verificationof the DSC results the test item was additionally tested with the capillary method. At 120 °C the colour of the test item changed to brown. At approx. 128 °C bubbles, formation of gas and rise of the test item were observed. Above 150 °C strong bubbles were detected. In the temperature range of 250 °C to ~330 °C the colour of the test item was changed to grey/brown and turbid. The measurement was stopped at 350 °C with a dark grey residue remaining in the capillary. Neither a melting nor a boiling of the test item could be observed. It is assumed, that the test item decomposes at temperatures >120 °C. Results correlate with the DSC measurement in an open crucible.

Conclusions:

No definitive signs of boiling of the test item 2-ethylhexanoic acid, iron salt were observed by differential scanning calorimetry (DSC) measurements (open glass crucible under nitrogen, up to 600 °C, heating rate of 10 K/min) and by the capillary method (up to 350 °C, heating rate of 10 K/min). The measurements were performed according to Regulation EC No. 440/2008 Method A.1./A.2. and OECD Test Guidelines 102/103 (1995) at atmospheric pressure (994 – 1006 hPa). It is assumed that the test item decomposes with a mass loss of ~80 % at temperatures >120 °C.

Description of key information

No definitive signs of boiling of the test item 2-ethylhexanoic acid, iron salt were observed by differential scanning calorimetry (DSC) measurements (open glass crucible under nitrogen, up to 600 °C, heating rate of 10 K/min) and by the capillary method (up to 350 °C, heating rate of 10 K/min). The measurements were performed according to Regulation EC No. 440/2008 Method A.1./A.2. and OECD Test Guidelines 102/103 (1995) at atmospheric pressure (994 – 1006 hPa). It is assumed that the test item decomposes with a mass loss of ~80 % at temperatures >120 °C.