5-sulphosalicylic acid

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 2017-07-14 to 2017-08-03

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

>= 109 - <= 117 °C

Decomposition:

yes

Decomp. temp.:

> 110 - < 130 °C

Appearance of the sample

Before the test the appearance of the test item was white powder. After the experiments the test item was blackened and melted in the crucible.

Results

Using a 10 °C/min heating rate, the melting point of the test item was determined to be in the range of 109 - 117 °C (382 - 391 K).

Summary of the DSC Test of Test Item

	Experiment 1	Experiment 2	Experiment 3	Mean
Onset of effect [°C]	110	110	109	109
Endset of effect [°C]	116	115	121	117

Following Siwoloboff method, the melting and decomposition of the test item was visually confirmed.

Temperature, °C	Observation
109	partially melted
110	most of it was colourless melt, on the top of the melt solid, crystalline was present
112	colourless, unevenly distributed melt, partially moved towards the upper part of the sample tube
115	the melt became light pink
120	the melt became darker pink
130	the melt became light brown

Conclusions:

The melting range of the test item was determined to be 109 - 117 °C (382 - 391 K).

Executive summary:

A study was conducted according to OECD TG 102, Regulation (EC) No 440/2008 method A.1 and EPA OPPTS 830.7200 to determine the melting point/range of the test item using differential scanning calorimetry. The test item was weighed into an aluminium crucible under an inert atmosphere (nitrogen). Three tests with about 3 – 5 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The substance is a white powder at ambient conditions. The crucible was heated from room temperature to 500 °C with 10 °C/min heating rate. The melting range of the test item was determined to be 109 to 117 °C at atmospheric pressure (1013 hPa).

Description of key information

Using a 10 °C/min heating rate, the melting point of the test item was determined to be in the range of 109 - 117 °C (382 - 391 K).

Additional information

A study (reference 4.2-1) was conducted according to OECD TG 102, Regulation (EC) No 440/2008 method A.1 and EPA OPPTS 830.7200 to determine the melting point/range of the test item using differential scanning calorimetry. The test item was weighed into an aluminium crucible under an inert atmosphere (nitrogen). Three tests with about 3 – 5 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The substance is a white powder at ambient conditions. The crucible was heated from room temperature to 500 °C with 10 °C/min heating rate. The melting range of the test item was determined to be 109 to 117 °C at atmospheric pressure (1013 hPa).