Phosphinate1030

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

no

GLP compliance:

yes

Type of method:

flask method

Specific details on test material used for the study:

Batch No.: F-13-003 (please refer to to certificate of analysis)

Key result

Water solubility:

525 g/L

Conc. based on:

test mat.

Temp.:

20 °C

Remarks on result:

other: ± 12 g/l

Details on results:

The water solubility cS of the test item DEPNa (diethyl phosphinic acid sodium salt) at a temperature of 20 °C was determined according to the flask 525 g/l (± 12 g/l)

Preliminary visual estimation of the water solubility

The preliminary visual estimation was performed as a single experiment. Demineralized water was added at ambient temperature to a defined amount of the test item. After the addition of water the mixture was treated with ultrasound for 10 minutes and visually checked for any undissolved particles.

Table3: Results of the preliminary visual estimation of the water solubility

Amount of test item / mg	Added volume of dist. water / ml	Total volume / ml	Appearance of mixture
68.5	0.1	0.1	dissolved

The preliminary visual experiments showed that the water solubility of the test item is > 10 mg/l. According to the preliminary visual estimation in the main test the water solubility was determined by the flask method.

As the water solubility determined in the preliminary test was very high, an additional stirring test was performed to determine the highest amount of test item that can still be stirred sufficiently in a mixture with water.

Table4: Results of the stirring test

Amount of test item [g]	Added volume of dist. water [ml]	Total volume [ml]	Observation
10.0	5	5	could not be stirred
	1	6	could not be stirred
	1	7	could not be stirred
	1	8	could be stirred

According to the stirring test mixtures with a concentration of approx. 1250 g/l test item in dist. water were used in the main test.

Flask method

The flask method was performed as described in chapter4.1.2. The data for the evaluation are given inTable5. After the equilibration time precipitate was observed in the flasks of the experiments excluding in the blank experiment.The water solubility was calculated from the measured and unrounded concentration values and not from the rounded values given inTable5.

Table5: Water solubility experiments of the test item

Experiment	24 h experiment	48 h experiment	72 h experiment	Blank experiment (72 h)
Amount of test item / g	13.1	13.1	13.2	-
Amount of demineralized water / ml	10	10	10	10
Stirring time at 30 °C / h	24	48	72	72
pH at 23 °C	7.1	7.0	7.0	6.3
Aliquot of the flasks / ml	1.0	1.0	1.0	1.0
1^stDilution to volume / ml	50	50	50	50
Aliquot of the flasks / ml	2.0	2.0	2.0	2.0
2^ndDilution to volume / ml	20	20	20	20
Dilution factor	500	500	500	500
Measured carbon concentration / mg/l	352.2 / 344.8	337.4 / 328.8	347.3 / 342.8	- / -
Mean carbon concentration / g/l	174.3	166.6	172.5	-
Water solubility^1)/ g/l	534.7	511.0	529.1	-

¹⁾According to the certificate of analysis the carbon content of the test item is 32.6 %.

The water solubility of the test item at 20 °C was determined to be525 g/l (± 12 g/l).

Conclusions:

The water solubility Cs of the test item diethyl phosphinic acid sodium salt at a temperature of 20 °C was determined according to the flask 525 g/l (± 12 g/l)

Executive summary:

The water solubility Cs of the test item diethyl phosphinic acid sodium salt at a temperature of 20 °C was determined according to the flask 525 g/l (± 12 g/l)

Description of key information

The water solubility Cs of the test item diethyl phosphinic acid sodium salt at a temperature of 20 °C was determined according to the flask 525 g/l (± 12 g/l)

Key value for chemical safety assessment

Water solubility:

525 g/L

at the temperature of:

20 °C