Sodium propionate

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 2017-03-09 to 2017-04-05

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)

Remarks:

TOXI-COOP Toxicological Research Center Zrt., H-8230 Balatonfüred, Arácsi út 97-99, Hungary (+ 5 further Hungarian addresses)

Type of method:

capillary method

Key result

Melting / freezing pt.:

289.3 °C

Atm. press.:

1 013.25 hPa

Decomposition:

no

Sublimation:

no

During the preliminary test using a linear heating rate of 10 °C/min the phase transition of test item was observed at 290 °C.

Table 1. Measured temperatures corresponding to the melting point of Test Item (three experiments (I, II, III) with three parallel samples each (1, 2, 3))

Sample	Temperature (°C)	Mean (°C)	Standard Deviation	Confidence interval (95 %)
I /1	289.3	289.3	0.34	0.29
I /2	290.1
I /3	289.2
II /1	* 293.4
II /2	289.0
II /3	289.1
III /1	289.3
III /2	289.1
III /3	289.2

* Measurement error

In the course of the Boiling point study (reference [4.3-1]), a DSC measurement was performed and the melting point of the test item was observed at ca. 290 °C.

Conclusions:

Using a linear heating rate of 0.5 °C/min the melting point of the test item was determined to be 289.3 °C (562.4 K).

Executive summary:

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OPPTS test guideline 830.7200 to determine the melting point of the test item using capillary method. In a preliminary test, asmall amount of the test item was heated in the electronic controlled sample block and the temperature around the sample was displayed. The melting point was determined based on thermo-optical changes while raising the temperature.In the main test, asmall amount of test item was charged in capillary glass tubes with a diameter of about 2 mm and packed tightly to obtain a filling level of approximately 5 mm. Three capillaries were heated in the oven of the melting point device. Heating was started from 279 °C. This start temperature was chosen based on the results from the preliminary test. Temperature rise was adjusted to 0.5 °C/min. The melting point of the test item was determined to be 289.3 °C at 1013.25 hPa.

Description of key information

The melting point of the test item was determined to be 289.3 °C (562.4 K).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

289.3 °C

Additional information

A study (reference 4.2-1) was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OPPTS test guideline 830.7200 to determine the melting point of the test item using capillary method. In a preliminary test, a small amount of the test item was heated in the electronic controlled sample block and the temperature around the sample was displayed. The melting point was determined based on thermo-optical changes while raising the temperature. In the main test, a small amount of test item was charged in capillary glass tubes with a diameter of about 2 mm and packed tightly to obtain a filling level of approximately 5 mm. Three capillaries were heated in the oven of the melting point device. Heating was started from 279 °C. This start temperature was chosen based on the results from the preliminary test. Temperature rise was adjusted to 0.5 °C/min. The melting point of the test item was determined to be 289.3 °C at 1013.25 hPa.