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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
Study period:
03 May 2018 - 05 June 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Specific details on test material used for the study:
- Batch: D05/38
- Expiration date: 30 August 2021
- Purity: 97.36%
- Storage condition of test material: Room temperature in the dark
Key result
Water solubility:
1 g/L
Conc. based on:
test mat.
Loading of aqueous phase:
1 g/L
Incubation duration:
3 d
Temp.:
20 °C
pH:
>= 10.6 - <= 10.7
Remarks on result:
other: The result is based on 2 and 3 day results, as equilibrium was reached
Details on results:
- Calibration: The detector calibration was found to be linear over the range of 95 to 955 mg/L in acidified methanol with a correlation coefficient of 0.9976.

TABLE 1 – Standard Calibration for Potassium 12-hydroxystearate

Standard concentration
(mg/L)

Peak area

 

 

954.6

1941.4

763.7

1435.1

572.8

1055.3

381.8

637.52

190.9

316.68

95.46

125.75

 

 


Linear regression    y = 2.08x - 105, r = 0.9976

x = concentration

y =  peak area

r  =  regression coefficient

TABLE 2 – Summary of Water Solubility Results

Days at 30°C

Sample

Concentration
(g/L)

pH

 

 

 

 

1

1 A

0.7679

10.5

1 B

0.7064

10.4

 

 

 

 

2

2 A

0.9289

10.6

2 B

0.9321

10.6

 

 

 

 

3

3 A

1.001

10.6

3 B

1.053

10.7

 

 

 

 


Mean   =  0.98 g/L

SD      =  0.06 g/L

RSD    =  6.1 %

 

The statistics were based on the day 2 and 3 results, as equilibrium had been reached.

 

 

TABLE 3 - Water Solubility

Sample

Peak area

Concentration,
CA
(mg/L)

Dilution factor

Concentration, CB
(g/L)

 

 

 

 

 

572.8 mg/L std

615.68

-

-

-

Sample 1 A

165.90

153.6

5

0.7679

Sample 1 B

152.61

141.3

5

0.7064

Sample 2 A

200.69

185.8

5

0.9289

Sample 2 B

201.38

186.4

5

0.9321

572.8 mg/L std

621.81

-

-

-

Sample 3 A

211.14

200.1

5

1.001

Sample 3 B

222.13

210.5

5

1.053

572.8 mg/L std

586.88

-

-

-

 

 

 

 

 
Conclusions:
The solubility of potassium 12-hydroxystearate in pure water was determined to be 1.0 ± 0.1 g/L at 20°C.
Executive summary:

The water solubility of potassium 12 -hydroxystearate was determined in a GLP-compliant study following OECD guideline 105, using the flask method. The solubility of potassium 12-hydroxystearate in pure water was determined to be 1.0 ± 0.1 g/L at 20°C.

Description of key information

The solubility of potassium 12-hydroxystearate in pure water was determined to be 1.0 ± 0.1 g/L at 20°C.

Key value for chemical safety assessment

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

Additional information

The water solubility of potassium 12 -hydroxystearate was determined in a GLP-compliant study following OECD guideline 105, using the flask method (Agrochemex 2018).