Propanoic acid, 2-hydroxy-, ammonium salt (1:1), (2S)-

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-02-01 to 2017-03-22

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

GLP compliance:

no

Type of method:

differential scanning calorimetry

Boiling pt.:

184 °C

Atm. press.:

1 atm

Decomposition:

yes

Remarks on result:

other: dried sample

Key result

Boiling pt.:

185 °C

Atm. press.:

1 atm

Decomposition:

yes

Remarks on result:

other: native sample

Results:

The boiling point can be calculated from the onset, whereby impure samples are characterised by their peak maximum. The peak onsets and maxima of the analysed samples are given in the following table:

Measurement	Sample	Weigh-in	Peak-onset	Peak maximum	Weight loss
		[mg]	[°C]	[°C]	[%]
1	dried	5.75	145	181	83.3
2	dried	9.24	148	186	76.6
3	dried	10.91	151	186	81.0
4	native	23.36	118	132	97.0
			168	193
5	native	14.65	120	131	103
			164	176

The DSC curves of the measurements using dried sample only show one peak at approx. 184 °C, which marks the boiling point. The following slight increase of the signal indicates the decomposition of the analysed sample. For the native sample, two peaks were obtained in the DSC measurement. The first one (maximum at approx. 132 °C) is related to the boiling point of water and the second one (maximum at approx. 185 °C) to the boiling point of Ammonium-(S)-lactate followed by decomposition of the analysed sample. The boiling points of the native and dried sample are in good accordance.

Conclusions:

The boiling point of Ammonium-(S)-lactate, which was determined according to OECD Guideline 103 using Differential Scanning Calorimetry, is 185 °C.

Executive summary:

The boiling point of Ammonium-(S)-lactate was determined according to OECD Guideline 103 using Differential Scanning Calorimetry. The substance was measured in its native form (liquid) and after drying. The boiling point of the native sample was 185 °C, which is in accordance with the boiling point of the dried sample (184 °C).

Description of key information

The boiling point of Ammonium-(S)-lactate, which was determined according to OECD Guideline 103 using Differential Scanning Calorimetry, is 185 °C.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

185 °C