4-[bis(phenylsubstituted)substituted]phthalic acid

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experimental starting date: 13 December 2017. Experimental completion date: 08 March 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Test material

Reference

Name:

Unnamed

Type:

Constituent

Test material form:

solid: particulate/powder

Results and discussion

Water solubility

Water solubility:

ca. 0.35 g/L

Conc. based on:

test mat.

Incubation duration:

1 h

Temp.:

20 °C

pH:

ca. 2.6

Details on results:

Typical chromatography is presented in attached background material.

Any other information on results incl. tables

Preliminary Test 1

The preliminary estimate of the water solubility at 20.0 ± 0.5 °C using longer shaking and equilibration periods was approximately 7.5 x 10^-3 g/L. The solution had a pH of 2.3.

Preliminary Test 2

The preliminary estimate of the water solubility at 20.0 ± 0.5 °C using shorter shaking and equilibration periods was 0.235 g/L. The solution had a pH of 2.5.

Definitive Test

The mean peak areas relating to the standard and sample solutions are shown in the following table:

Solution	Mean Peak Area
Standard 102 mg/L	1.2331 x 10^7
Standard 102 mg/L	1.2187 x 10^7
Matrix blanks	None detected
Sample 1A	1.0489 x 10^7
Sample 1B	1.0463 x 10^7
Sample 2A	9.2931 x 10^6
Sample 2B	9.2009 x 10^6
Sample 3A	8.3669 x 10^6
Sample 3B	8.3069 x 10^6

The concentration (g/L) of test item in the sample solutions is shown in the following table:

Sample Number	Time Shaken at ~30°C (hours)	Concentration (g/L)	Solution pH
1	1	0.349	2.6
2	2	0.308	2.6
3	3	0.277	2.5

Overall concentration : approximately 0.35 g/L at 20.0 ± 0.5 ºC

Validation

The linearity of the detector response with respect to concentration was assessed over the nominal concentration range of 25 to 200 mg/L. The results were satisfactory with a correlation coefficient (r) of 1.000 being obtained.

Applicant's summary and conclusion

Conclusions:

The water solubility of the test item has been determined to be approximately 0.35 g/L of solution at 20.0 ± 0.5 °C. Due to the test item being unstable in water, this result represents an approximate short term maximum.

Executive summary:

Water solubility determination was carried out by the flask method, using a procedure designed to be compatible with Method A.6 Water Solubility of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 105 of the OECD Guidelines for Testing of Chemicals, 27 July 1995.

The water solubility of the test item has been determined to be approximately 0.35 g/L of  solution at 20.0 ± 0.5 °C. Due to the test item being unstable in water, this result represents  an approximate short term maximum.