Benzenesulfonic acid, 4-mono-C20-24 (even numbered)-alkyl derivs., magnesium salts

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2012-09-20 - 2012-12-19

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Guideline study with certificated GLP compliance. No methodology deficiencies are reported.

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

GLP compliance:

yes (incl. QA statement)

Remarks:

The Department of Health of the Government of The United Kingdom

Type of method:

flask method

Water solubility:

0 g/L

Temp.:

20

Remarks on result:

other: pH is not reported.

Details on results:

Anionic components must have been present since an anion exchange column was required. Based on this components, the determined water solubility was an over estimation since the anions have the typical structure of a surface active material and it could be different to remove the excess from the samples. Additionally, the water solubility of the test substance in an undissociated from would be expected to be much lower than the obtained result.

Table 1. Mean Peak Areas

Solution	Mean Peak Area
Standard 103mg/L	4.4879x10^7
Standard 106mg/L	4.7949x10^7
Sample 1A	1.5136x10^7
Sample 1B	1.0362x10^7
Sample 2A	6.1113x10^6
Sample 2B	3.7221x10^6
Sample 3A	7.8210x10^6
Sample 3B	9.5757x10^6

Table 2. Test substance concentration in sample solutions

Sample Number	Time Shaken at ~ 30 °C (hours)	Time Equilibrated at20°C (hours)	Concentration (g/L)	Solution pH
1	24	24	2.88 x 10^-4	6.0
2	48	24	1.11 x 10^-4	6.0
3	72	24	1.96 x 10^-4	6.1

Conclusions:

Interpretation of results (migrated information): slightly soluble (0.1-100 mg/L)
The study report describes a valid guideline study conducted under certificated GLP compliance. The water solubility was determined to be 1.98 x 10E-4 g/L at 20 +/- 0.5 °C.

Executive summary:

Using the shake flask method, the water solubility of magnesium sulfonate target substance (CAS 231297-75-9) was determined according to OECD Guideline 105/EU Method A.6 (Fox, 2012). A preliminary test was performed in order to select the appropriate method (column elution or shake flask) and to determine the approximate amount of test substance to be used in the definitive test. The sample analysis was performed via High Performance Liquid Chromatography (HPLC). As result, a water solubility of 1.98 x E-4 g/L at 20 +/- 0.5 °C is reported. Anionic components must have been present since an anion exchange column was required. Based on this components, the determined water solubility was an over estimation since the anions have the typical structure of a surface active material and it could be different to remove the excess from the samples. Additionally, the water solubility of the test substance in an undissociated from would be expected to be much lower than the obtained result.

Description of key information

OECD 105/EU Method A.6_Shake flask method_Water solubility: 0.198 mg/L 

Key value for chemical safety assessment

Water solubility:

0.198 mg/L

at the temperature of:

20 °C

Additional information

The key value was determined using the shake flask method in accordance to OECD Guideline 105/EU Method A.6 (Fox, 2013). The test substance is considered to be slightly soluble at 20 +/- 0.5 °C.