Formaldehyde, reaction products with m-phenylenediamine, sodium sulfide (Na2S) and sulfur

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2011-10-10 to 2012-01-23

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

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. 31.4 mg/L

Temp.:

20 °C

pH:

ca. 4.8

Remarks on result:

other: The value reflects the solubility of the organic dye fraction in the test item

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 3.2

Solution	Total Organic Carbon (mg/L)
Check standard 50 mg/L	49.37
Sample blank	1.359
Sample lA	15.76
Sample 1B	15.34
Sample 2A	15.82
Sample 2B	16.50
Sample 3A	15.42
Sample 3B	15.72

 

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	3.09 x 10-2	4.4
2	48	24	3.22 x 10-2	4.7
3	72	24	3.09 x 10-2	4.8

 

Mean concentration of main component: 3.14 x 10-2g/L at 20.0 ± 0.5 °C

Range: 3.09 x 10-2to 3.22 x 10-2 g/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:

During this study the water solubility of the main component in Leuco Sulfur Brown 37 (i.e. the organic dye fraction) was determined and found to be 31.4 mg/L at 20 °C using the flask shaking method.

Description of key information

During this study the water solubility of the organic dye fraction contained in Leuco Sulfur Brown 37 was determined and found to be 31.4 mg/L at 20 °C using the flask shaking method.

 

Key value for chemical safety assessment

Water solubility:

31.4 mg/L

at the temperature of:

20 °C