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Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
14.07. - 06.12.16
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:
flask method
Key result
Water solubility:
0.46 g/L
Conc. based on:
test mat.
Loading of aqueous phase:
161.5 other: mg/20 ml demineralized water
Incubation duration:
72 h
Temp.:
20 °C
pH:
> 6 - < 6.4

Preliminary test

Three preliminary tests were carried out with specified amounts of the test item and 100 ml and 500 ml demineralized water, respectively. After each addition of an amount of water, the mixture was stirred for at least 24 hours, and visually checked for any undissolved particles.

 

Table 1: Results of the preliminary test

Amount of test item /mg

Total volume of demineralized water / mL

Appearance of mixture

6.5

100

Not dissolved

9.0

500

particles on the surface

3.3

500

few small suspended particle

 

As the results of the preliminary test were ambiguos EPI SUite was used for an estimation of the water solubility. The calculated value was 161 mg/l. According to the preliminary estimation in the main test the water solubility was determined by the flask method.

Flask method

The flask method was performed as described. The data for the evaluation are given in the table. 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 in Table 2.

 

Table 2: 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 / mg

161.8

169.2

161.5

 -

Amount of demineralized water / ml

20

20

20

20

Stirring at 30 °C / h

24

48

72

72

pH at 22 °C

6.0

6.4

6.3

6.1

Aliquots of the flasks / ml

0.1

0.1

0.1

0.1

1st Dilution to volume / ml

1.0

1.0

1.0

1.0

Aliquot of the flasks / ml

0.1

0.1

0.1

0.1

2nd Dilution to volume / ml

1.0

1.0

1.0

1.0

 Dilution factor  100  100  100  100
 Measured concentration / mg/l  4.78 / 4.43  4.56 / 4.56  4.63 / 4.62  - / -
 Mean concentration / mg/l  4.61  4.56  4.63  --
 Water solubility / g/l  0.461  0.456  0.463  --

 

The water solubility of the test item at 20 °C was determined to be 0.46 g/l (+/- 0.003 g/l).

 

Conclusions:
The water solubility cs of the test item at a temperature of 20°C was determined according to the flask method. It was found to be: cs = 0.46 g/l (± 0.003 g/l).
Executive summary:

The water solubility was determined according to OECD 105 using the flask method. The preliminary test and estimation showed that the water solubility of the test item is > 100 mg/L. Thus the water solubility of the test item was determined with the flask method showing a solubility: cs= 0.46 g/l (+/-0.003 g/l).

Description of key information

The water solubility was determined according to OECD 105 using the flask method. The preliminary test and estimation showed that the water solubility of the test item is > 100 mg/L. Thus the water solubility of the test item was determined with the flask method showing a solubility: cs= 0.46 g/l (+/-0.003 g/l).

Key value for chemical safety assessment

Water solubility:
0.46 g/L
at the temperature of:
20 °C

Additional information

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