Registration Dossier

Physical & Chemical properties

Water solubility

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
03 Jun - 20 Sep 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Remarks:
Flask method (modified procedure)
Qualifier:
according to
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
adopted in 1995
GLP compliance:
yes (incl. certificate)
Remarks:
Ministerium für Arbeit, Integration und Soziales des Landes Nordrhein-Westfalen, Düsseldorf, Germany
Type of method:
flask method
Specific details on test material used for the study:
Storage conditions: at room temprature, tightly closed, dry
Water solubility:
10.2 g/L
Conc. based on:
element
Remarks:
phosphorus
Temp.:
23 °C
pH:
>= 6.2 - <= 6.9
Water solubility:
9.7 g/L
Conc. based on:
element
Remarks:
sulphur
Temp.:
23 °C
pH:
>= 6.2 - <= 6.9
Water solubility:
0.029 g/L
Conc. based on:
element
Remarks:
zinc
Temp.:
23 °C
pH:
>= 6.2 - <= 6.9

Results of the P-analysis:

Sample no.

Amount of test item

[g]

Added volume of water

[mL]

Shaking time at 30°C

[h]

Dilution factor

Analysed concentration of P

[mg/L]

Mean value

P [g/L]

pH value1)

1

0.5156

50

72

1000

0.707142

0.74

6.9

2

0.5031

72

1000

0.779720

3

0.5005

96

1000

0.794127

0.81

6.7

4

0.5140

96

1000

0.822756

5

0.5051

120

1000

0.827194

0.83

6.2

6

0.5023

120

1000

0.841795

1)   The purified water used for the tests had a pH of 5.5.

The mean value of the samples after 120 h did not exceed the mean values of the sample after 96 h and 72 h by more than 15 %. So, the three duplicate sets of samples showed no tendency of increasing concentration values.

Water solubility

mean value P

samples 1 - 6

 [g/L]

Standard deviation

 [g/L]

Rel. standard deviation [%]

Water solubility

mean value test item [g/L]*

8.0 x 10-1

4.9 x 10-2

6.2

10.2

*calculated with the content of the neat test item given by the study monitor: 7.83 %

The relative standard deviation did not exceed 15 %. Therefore, the tests were valid.

Results of the S-analysis:

Sample no.

Amount of test item

[g]

Added volume of water

[mL]

Shaking time at 30°C

[h]

Dilution factor

Analysed concentration of S

[mg/L]

Mean value

S [g/L]

pH value1)

1

0.5156

50

72

1000

1.47341

1.54

6.9

2

0.5031

72

1000

1.60410

3

0.5005

96

1000

1.64377

1.67

6.7

4

0.5140

96

1000

1.70024

5

0.5051

120

1000

1.70996

1.73

6.2

6

0.5023

120

1000

1.75470

1)     The purified water used for the tests had a pH of 5.5.

The mean value of the samples after 120 h did not exceed the mean values of the sample after 96 h and 72 h by more than 15 %. So, the three duplicate sets of samples showed no tendency of increasing concentration values.

Water solubility

mean value S

samples 1 - 6

 [g/L]

Standard deviation

 [g/L]

Rel. standard deviation [%]

Water solubility

mean value test item [g/L]*

1.6

1.0 x 10-1

6.1

9.7

*calculated with the content of the neat test item given by the study monitor: 16.52 %

The relative standard deviation did not exceed 15 %. Therefore, the tests were valid.


 

Results of the Zn-analysis:

Sample no.

Amount of test item

[g]

Added volume of water

[mL]

Shaking time at 30°C

[h]

Dilution factor

Analysed concentration of Zn

[mg/L]

Mean value

Zn [g/L]

pH value1)

1

0.5156

50

72

-

2.49710

0.0024

6.9

2

0.5031

72

-

2.34973

3

0.5005

96

-

2.54903

0.0026

6.7

4

0.5140

96

-

2.61292

5

0.5051

120

-

2.71764

0.0027

6.2

6

0.5023

120

-

2.70537

1)     The purified water used for the tests had a pH of 5.5.

The mean value of the samples after 120 h did not exceed the mean values of the sample after 96 h and 72 h by more than 15 %. So, the three duplicate sets of samples showed no tendency of increasing concentration values.

Water solubility

mean value Zn

samples 1 - 6

 [g/L]

Standard deviation

 [g/L]

Rel. standard deviation [%]

Water solubility

mean value test item [g/L]*

2.6 x 10-3

1.4 x 10 -4

5.4

2.9 x 10-2

*calculated with the content of the neat test item given by the study monitor: 9.04 %.

The relative standard deviation did not exceed 15 %. Therefore, the tests were valid.

Summary of the results (at 23 °C; pH 6.2 – 6.9):

Water solubility

(samples 1-6)

Mean value

[g test item/L]

Evaluation based on phosphorus-analysis

10.1

Evaluation based on

sulphur-analysis

9.7

Evaluation based on

zinc-analysis

2.9 x 10-2

 

The clear difference of the water solubility results depending on the respective element used for analysis (phosphor and sulphur compared with zinc: factor approx.100) indicated, that the test item decomposed (at least in parts) in soluble and insoluble compounds or due to formation of complexes.

This may probably due to hydrolysis of the test item during the experimental procedure.

Description of key information

Evaluation based on phosphorus-analysis: 10.2 g/L

Evaluation based on sulphur-analysis: 9.7 g/L

Evaluation based on zinc-analysis: 2.9E-02 g/L

at 23 °C; pH 6.2 - 6.9

(OECD 105, flask method)

Key value for chemical safety assessment

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

Additional information

The key value of water solubility for chemical safety assessment was based on the phosphorus analysis, because the solubility of test substance in n-octanol was also based on the phosphorus analysis.