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Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-10-09 - 2018-01-07 (experimental phase)

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Version / remarks:

Method 105 of the OECD Guidelines for Testing of Chemicals, 27 July 1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Version / remarks:

Method A.6 Water Solubility of Commission Regulation (EC) No 440/2008 of 30 May 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Key result

Water solubility:

0.013 g/L

Conc. based on:

other: Amine, C12-14-tert-alkyl cation content

Loading of aqueous phase:

138 mg/L

Incubation duration:

72 h

Temp.:

20 °C

pH:

>= 6.6 - <= 6.7

Remarks on result:

other: Loading of aqueous phase is given as mean of three flasks, incubation duration is the maximum time.

Key result

Water solubility:

0.011 g/L

Conc. based on:

other: O,O-di-ethylhexyl hydrogen phosphorodithioate anion content

Loading of aqueous phase:

138 mg/L

Incubation duration:

72 h

Temp.:

20 °C

pH:

>= 6.6 - <= 6.7

Remarks on result:

other: Loading of aqueous phase is given as mean of three flasks, incubation duration is the maximum time.

Conclusions:

The water solubility of the registered substance was determined in a GLP guideline study according to OECD 105 and EU method A.6 without deviations on the registered substance itself. The method was considered suitable for the nature of the test item. Hence, there is no indication given that the results are not reliable. The results, presented as equivalent concentrations of test item whist monitoring the specified components, are 1.30 x 10E-2 g/l for the Amine, C12-14-tert-alkyl cation content, and 1.05 x 10E-2 g/l for the O,O-di-ethylhexyl hydrogen phosphorodithioate anion content. So with a water solubility of 10.5 or 13 mg/l, the test item is considered moderately water soluble acc. Ronald Ney, "Fate and Transport of Organic Chemicals in the Environment" 1995; p. 10.

Executive summary:

Testing for the water solubility of the test item was performed using a flask method, designed to be compatible with Method A6 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 under GLP. The results, presented as equivalent concentrations of test item whist monitoring the specified components, are summarized in the following table:

Component	Equivalent Test Item Solubility (g/L of solution at 20.0±0.5°C)
Amine, C12-14-tert-alkyl cation content	1.30 x 10E-2
O,O-di-ethylhexyl hydrogen phosphorodithioate anion content	1.05 x 10E-2

Description of key information

Water solubility: 13 mg/l for the Amine, C12-14-tert-alkyl cation content, and 10.5 mg/l for the O,O-di-ethylhexyl hydrogen phosphorodithioate anion content at pH 6.6 to 6.7 and a test temperature of 20.0 ± 0.5 °C (flask method, OECD 105, GLP)

Key value for chemical safety assessment

Water solubility:

10.5 mg/L

at the temperature of:

20 °C

Additional information

The given water solubility of 10.5 mg/l does not depict the actual situation properly. The water solubility was determined for the cation and anion part separately, to 13 mg/l for the Amine, C12-14-tert-alkyl cation content, and 10.5 mg/l for the O,O-di-ethylhexyl hydrogen phosphorodithioate anion content. As, due to limitations of this text field, only one value can be entered, the priority was set to the most critical one.