Disodium tartrate

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 November 2015 - 10 December 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

No. 440/2008 and No. 761/2009

GLP compliance:

no

Type of method:

effusion method: Knudsen cell

Specific details on test material used for the study:

Storage conditions: Ambient temperature (10 to 30 °C)

Key result

Test no.:

#1

Temp.:

20 °C

Vapour pressure:

0 Pa

Remarks on result:

other:

Remarks:

Fitted values. Fitting based on Antoine equation logP=A+B/(C+T)

Key result

Test no.:

#2

Temp.:

25 °C

Vapour pressure:

0 Pa

Remarks on result:

other:

Remarks:

Fitted values. Fitting based on Antoine equation logP=A+B/(C+T)

Key result

Test no.:

#3

Temp.:

50 °C

Vapour pressure:

0 Pa

Remarks on result:

other:

Remarks:

Fitted values. Fitting based on Antoine equation logP=A+B/(C+T)

Results
Before the measurement the test item was degassed at 70 °C for approx. 8 h. The vapour pressure was measured in the temperature range of 70 °C to 100 °C. The measured vapour pressures at the corresponding temperatures are listed in Table 1.

Table 1 - Measured vapour pressure and corresponding temperatures

Temperature [°C]	Vapour pressure [hPa]
70	4.5E-05
80	1.3E-04
90	1.2E-03
100	1.2E-03

 

The data point measured at 100 °C was not included in the linear regression because it shows an unusual behavior. Taking into account the unusual course of the measured vapour pressures as a function of the temperature it can be assumed that the measured vapour pressure was influenced by water of crystallization.

The values for 20, 25 and 50 °C were calculated using the Antoine constants A,B and C as shown in Table 2.

Table 2 – Antoine parameters and extrapolated vapour pressures

T [°C]	p [hPa]	log p = A + B/(C+T)
20	1.7E-09	A = 21.01576
25	5.3E-09	B = -8733.66
50	9.8E-07	C = 273.15

Description of key information

1.7E-07 Pa at 20 °C

5.3E-07 Pa at 25 °C

9.8E-05 Pa at 50 °C

(OECD 104, effusion method: Knudsen cell)

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

20 °C

Additional information

The vapour pressure at 20, 25 and 50 °C are extrapolated from the experimental data by using Antoine equation.