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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
yes
Remarks:
measurement of turbidity
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method A.6 (Water Solubility)
Deviations:
yes
Remarks:
measurement of turbidity
GLP compliance:
yes (incl. QA statement)
Type of method:
other: modified flask method
Key result
Water solubility:
2.5 mg/L
pH:
7.1 - 7.4
Remarks on result:
other: The test was performed at room temperature
Details on results:
The results from the two individual tests were 3.4 and 1.7 mg/L with a mean value of 2.5 mg/L (calculated from non-rounded values, see Table 1).

Table 1: Turbidimetric determination of critical micelle concentration

 

Run 1

Sample

Concentration

Turbidity measurements (NTU)

pH

ln

ln

 

(mg/L)

1

2

3

Mean

 

concentration

turbidity

 

 

 

 

 

 

 

 

 

1

440.2

46.6

46.6

46.6

46.6

7.1

6.087

3.842

2

220.1

23.7

23.7

23.7

23.7

7.1

5.394

3.165

3

110.1

12.8

12.7

13.0

12.8

7.2

4.701

2.552

4

55.03

6.48

6.38

6.38

6.41

7.1

4.008

1.858

5

27.51

3.49

3.47

3.40

3.45

7.2

3.315

1.239

6

13.76

1.91

1.90

1.90

1.90

7.2

2.622

0.644

7

6.878

0.79

0.79

0.80

0.79

7.1

1.928

-0.232

8

3.439

0.52

0.53

0.52

0.52

7.3

1.235

-0.648

9

1.720

0.53

0.35

0.36

0.41

7.3

0.542

-0.884

10

0.8598

0.52

0.44

0.37

0.44

7.1

-0.151

-0.813

11

0.4299

0.44

0.55

0.34

0.44

7.2

-0.844

-0.813

12

0.2149

0.48

0.48

0.42

0.46

7.2

-1.538

-0.777

 

 

 

 

 

 

 

 

 

 

Linear regression of points 1 to 8:

Linear regression of points 8 to 12:

 

y(1) = 0.9404x - 1.890

 

y(2) = 0.0271x - 0.7828

 

When y(1) = y(2), x = ln CMC

 

 

CMC = 3.4 mg/L

 

 

Run 2

Sample

Concentration

Turbidity measurements (NTU)

pH

ln

ln

 

(mg/L)

1

2

3

Mean

 

concentration

turbidity

 

 

 

 

 

 

 

 

 

1

459.2

57.3

57.2

57.1

57.2

7.4

6.129

4.047

2

229.6

25.6

25.6

25.6

25.6

7.2

5.436

3.243

3

114.8

14.3

14.3

14.3

14.3

7.3

4.743

2.660

4

57.40

7.42

7.42

7.46

7.43

7.3

4.050

2.006

5

28.70

3.77

3.67

3.67

3.70

7.2

3.357

1.309

6

14.35

1.88

1.88

1.88

1.88

7.3

2.664

0.631

7

7.175

0.88

0.76

0.76

0.80

7.2

1.971

-0.223

8

3.589

0.38

0.38

0.37

0.38

7.2

1.278

-0.976

9

1.794

0.22

0.18

0.17

0.19

7.2

0.584

-1.661

10

0.8969

0.16

0.16

0.16

0.16

7.2

-0.109

-1.833

11

0.4484

0.18

0.18

0.20

0.19

7.3

-0.802

-1.678

12

0.2242

0.16

0.15

0.16

0.16

7.1

-1.495

-1.854

 

 

 

 

 

 

 

 

 

 

Linear regression of points 1 to 9:

Linear regression of points 9 to 12:

 

y(1) = 1.025x - 2.215

 

y(2) = 0.0612x - 1.729

 

When y(1) = y(2), x = ln CMC

 

 

CMC = 1.7 mg/L

 

 

Conclusions:
Interpretation of results (migrated information): slightly soluble (0.1-100 mg/L)

Description of key information

2.5 mg/L at 20 °C, pH 7 (OECD 105 and EU A.6)

Key value for chemical safety assessment

Water solubility:
2.5 mg/L
at the temperature of:
20 °C

Additional information