Phosphoric acid, mono- and di-C16-18 (even numbered) alkyl esters, salts with 2,2'-iminodiethanol

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

January 2020

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

GLP compliance:

no

Type of method:

other: measurement of DOC concentration in the filtrated test solutions using TOC analyser

Specific details on test material used for the study:

Condition at Receipt room temperature, in proper conditions
The following information concerning identity and composition of the test item was provided by the sponsor.
Name
Fosfotex C16/18 DEA
Composition
see composition 1.2
Storage
room temperature (20 ± 5 °C)
Storage
The test item was stored in a closed flask at room temperature (20 ± 5 °C), protected from humidity.
Pre-Treatment
The test item was frozen at -80°C for 30 minutes and finely ground before usage.

Key result

Water solubility:

>= 13.2 - <= 116.1 mg/L

Conc. based on:

act. ingr. (dissolved fraction)

Temp.:

20 °C

pH:

>= 7.46 - <= 8.2

Remarks on result:

other: slightly Tyndall effect

Details on results:

Measurements during Equilibration
The carbon content of the test item 62.85 % was used in the calculation of the test item concentration from the measured DOC concentrations.
Measurements at Plateau
DOC between 8.3 - 73.0 at 20 °C with pH 7.46 - 8.10
Dependency of pH value on amount of the test item (nominal load) was not perceived.

As solubility was dependent on nominal concentration, no exact value for the solubility of the test item in water can be stated. The solubility range for the tested nominal concentra-tion 101 – 1001 mg/L is 13.2 – 116.1 mg/L at 20.0 ± 0.5 °C, corresponding to 12.3 % of the test item (mean value) relating to the nominal concentration of the test item.

Measurements used for Calculation of Solubility

Flask #	Measured Conc. Test Item [mg/L]	Nominal Conc. Test Item [mg/L]	Dissolved Part [%]
2	13.2	101	13.0
3	37.7	301	12.5
1*	64.9	501	13.0
4**	85.6	602	14.2
5	92.8	801	11.6
6	116.1	1001	11.6

Conclusions:

The solubility range for the tested nominal concentration 101 – 1001 mg/L is 13.2 – 116.1 mg/L at 20.0 ± 0.5 °C, corresponding to 12.3 % of the test item (mean value) relating to the nominal concentration of the test item.

Executive summary:

The solubility of Fosfotex C16/18 DEAin water was determined, according to OECD 105 and EU A.6, not il GLP, from the measured concentrations of DOC in the filtrated test solutions.

As solubility was dependent on nominal concentration, no exact value for the solubility of the test item in water can be stated. The solubility range for the tested nominal concentration 101 – 1001 mg/L is 13.2 – 116.1 mg/L at 20.0 ± 0.5 °C, corresponding to 12.3 % of the test item (mean value) relating to the nominal concentration of the test item.

No observations arousing doubts concerning the accuracy of the results and the validity of the study were made.

 

Description of key information

No exact value for the solubility of the test item in water can be stated.

Solubility range for the tested nominal concentration 101 – 1001 mg/L: 13.2 – 116.1 mg/L at 20.0 ± 0.5 °C.

Key value for chemical safety assessment

Water solubility:

71.25 mg/L

at the temperature of:

20 °C

Additional information

The solubility of the test item in water was determined, according to OECD 105 and EU A.6, from the measured concentrations of DOC in the filtrated test solutions.

The solubility range for the tested nominal concentration 101 – 1001 mg/L is 13.2 – 116.1 mg/L at 20.0 ± 0.5 °C.