Phenol, 4-(phenylamino)-, sulfurized, leuco deriv.

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

10.October.2011 - 19.01.2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Remarks:

Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

GLP compliance:

yes (incl. QA statement)

Remarks:

Date of signature July 2011

Type of method:

flask method

Key result

Water solubility:

ca. 22.3 mg/L

Temp.:

20 °C

pH:

ca. 4.3

Details on results:

Please see section Remarks on results including tables and figures.

The total carbon, inorganic carbon and total organic carbon concentrations of the samples and check standard are shown in the following table:

Table 2

Solution	Total Organic Carbon (mg/L)
Check standard 50 mg/L	49.37
Sample blank	1.359
Sample lA	14.31
Sample 1B	14.20
Sample 2A	305.70
Sample 2B	314.50
Sample 3A	12.88
Sample 3B	13.09

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

Table 3

Sample Number	Time Shaken at 30 °C (hours)	Time Equilibrated at 20 °C (hours)	concentration of Main Component (g/L)	Solution pH
1	24	24	2.35 x 10^-2	4.3
2	48	24	0.563	4.3
3	72	24	2.12 x 10^-2	4.3

 

Mean concentration of main component: 2.23 x 10-2g/L at 20.0 ± 0.5 °C

Range: 2.12 x 10 -2 to 2.35 x 10-2g/L

 

TOC was used to analyze the samples. The preliminary result did not include the subtraction of a sample blank, as was the case for the definitive test, as no sample blank was performed. This will therefore represent a worst case scenario.

Centrifugation was not used in the clean up procedure of the saturated samples of the definitive test as this had been shown to be ineffective during clean up of the preliminary test sample. The definitive result can be considered a worst case scenario as TOC analysis is not substance specific so any other carbon containing component from the test item would be measured as well.

Conclusions:

The water solubility of the test item was determined to be 22.3 mg/L at 20 °C.

Executive summary:

The water solubility was determined according to OECD 105 and Regulation (EC) No. 440/2008 method A.6 using the shake flask method. About 102-104 mg test item were weighed into 100 mL flasks according to the estimated solubility based on the Preliminary Test. After addition of glass double-distilled water to the flasks, they were shaken at approximately 30 °C for 24 hours, 48 hours and 72 hours and re-equilibrated at 20 °C for not less than 24 hours. The contents of the flasks were filtered through two 0.2 tm filters and the pH of each solution was measured. Total organic carbon (TOC) was used to analyze the samples. The water solubility of the test item was determined to be 22.3 mg/L at 20 °C.

Description of key information

The water solubility of the test item was determined to be 22.3 mg/L at 20 °C.

Key value for chemical safety assessment

Water solubility:

22.3 mg/L

at the temperature of:

20 °C

Additional information

The water solubility was determined according to OECD 105 and Regulation (EC) No. 440/2008 method A.6 using the shake flask method. About 102-104 mg test item were weighed into 100 mL flasks according to the estimated solubility based on the Preliminary Test. After addition of glass double-distilled water to the flasks, they were shaken at approximately 30 °C for 24 hours, 48 hours and 72 hours and re-equilibrated at 20 °C for not less than 24 hours. The contents of the flasks were filtered through two 0.2 tm filters and the pH of each solution was measured. Total organic carbon (TOC) was used to analyze the samples. The water solubility of the test item was determined to be 22.3 mg/L at 20 °C.