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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
17 Dec 2015 - 27 Jan 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
GLP compliance:
yes (incl. certificate)
Remarks:
Rheinland-Pfalz Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Mainz, Germany
Type of method:
method according to Siwoloboff
Boiling pt.:
240.8 °C
Atm. press.:
1 013.25 hPa
Decomposition:
yes
Remarks:
signs of decomposition - colour change to slightly yellow

Observations:

Observation

Determination

1st

2nd

3rd

Bubbles visible

Approx. 265 °C

-

-

Boiling chain, heating switched off

317.4 °C, steam visible in the head space

303.5 °C: superheating occurred, nearly all of the sample evaporated suddenly. The residue appeared red-brown.

321.9 °C, steam visible in the head space

No bubbles visible

Approx. 251 °C

Approx. 250 °C

Return into the boiling capillary

240.9 °C, colour changed to slightly yellow

239.6 °C, colour changed to slightly yellow

Obtained values of 240.9 °C and 239.6 °C were determined at 1003.0 hPa and at 1002.82 hPa, respectively. The second determination yielded no reliable results due to superheating. The values were corrected to standard pressure of 1013.25 hPa, using Sidney-Young equation. The procedure resulted in 241.4 °C and 240.1 °C, respectively, and the mean value is 240.8 °C. The standard deviation is ± 0.9 °C. Since the difference between the two determinations was below 2 °C (2 K), the result can be considered valid.

Description of key information

240.8. ± 0.9 °C at 1013.25 hPa (OECD 103, EU A.2)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
241 °C

Additional information

The boiling point of the substance trihexyl phosphate (CAS No. 2528-39-4) was determined using Siwoloboff method. The change of colour of the sample was interpreted as signs of decomposition at boiling temperature.