Sodium 4-(4-substitutedanilino)-4-substituedbut-2-enoate

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

27 Jul - 16 Aug 2016

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

Standard EC method A6 and OECD method 105 was not applicable to this test item due to the high indeterminable saturation levels produced

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Version / remarks:

adopted in 2008

Deviations:

yes

Remarks:

Standard EC method A6 and OECD method 105 was not applicable to this test item due to the high indeterminable saturation levels produced

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Version / remarks:

adopted in 1995

Deviations:

yes

Remarks:

Standard EC method A6 and OECD method 105 was not applicable to this test item due to the high indeterminable saturation levels produced

GLP compliance:

yes (incl. QA statement)

Remarks:

Department of Health, London, UK

Type of method:

flask method

Test material

Test material information

Constituent 1

Specific details on test material used for the study:

Storage conditions: room temperature in the dark

Results and discussion

Water solubility

Key result

Water solubility:

>= 667.53 - <= 814.97 g/L

Conc. based on:

test mat.

Incubation duration:

3 d

Temp.:

20 °C

pH:

>= 9.4 - <= 10

Remarks on result:

other:

Remarks:

Water solubility determined based on visual inspection

Details on results:

The standard EC method A6 and OECD method 105 was not applicable to this test item due to the high indeterminable saturation levels produced. It was therefore not possible to prepare samples at five times the saturation level as recommended in the guidelines. No analysis could be performed due to the high solubility producing unfilterable mixtures.
Therefore the water solubility was determined based on visual inspection.

Any other information on results incl. tables

Preliminary test

Results of the preliminary estimate of water solubility are shown in the following table.

Table 3

Concentration [% w/w]	Observation	pH
10.0	Dark yellow/brown solution with no excess test item present	8.6
30.0	Dark yellow/brown solution with no excess test item present	9.6
50.0	Dark yellow/brown solution with excess test item present	9.6
74.9	Yellow/brown wet looking solid	-
80.0	Yellow/brown solid, no liquid present	-
90.0	Yellow/brown solid, no liquid present	-

 

Preliminary test result: water solubility in the range 30.0 to 50.0% w/w at 20.0 ± 0.5 °C.

 

Definitive test

The results of the definitive test for the water solubility are shown in the following table.

Table 4

Concentration [% w/w]	Observation	pH
35.1	Dark yellow/brown solution, no excess test item visible	9.1
40.0	Dark yellow/brown solution, no excess test item visible	9.4
44.9	Dark yellow/brown solution, with small amount of undissolved test item floating within the solution	10.0

 

Water solubility in the range 40.0 to 44.9% w/w at 20.0 ± 0.5 °C. This corresponds to 667,53 to 814,97 g/L.

 

Discussion

The standard EC method A6 and OECD method 105 was not applicable to this test item due to the high indeterminable saturation levels produced. It was therefore not possible to prepare samples at five times the saturation level as recommended in the guidelines. No analysis could be performed due to the high solubility producing unfilterable mixtures.

Therefore the water solubility was determined based on visual inspection.

Conclusion

The water solubility of the test item has been determined to be in the range of 40.0 to 44.9% w/w of solution at 20.0 ± 0.5 °C.