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Administrative data

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19 January 2001 - 11 May 2001
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study under GLP

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2001
Report date:
2001

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method

Test material

Constituent 1
Reference substance name:
MV31 Kaliumsalz
IUPAC Name:
MV31 Kaliumsalz
Details on test material:
- Name of test material (as cited in study report): MV31 Kaliumsalz
- Substance type: Single component
- Physical state: grey globular substance
- Storage condition of test material: dry and room temperature

Results and discussion

Water solubilityopen allclose all
Water solubility:
345 g/L
Temp.:
30 °C
pH:
ca. 7.6
Remarks on result:
other: The reported water solubility corrected for purity of 88%. 24 h equilibration at 20 °C.
Water solubility:
761 g/L
Temp.:
80 °C
pH:
8.46
Remarks on result:
other: The reported water solubility corrected for purity of 88%. 24 h equilibration at 20 °C.
Details on results:
Three samples were prepared and stirred at 30 °C for 24, 48, and 72 hours, respectively. The samples were equlibrated at 20 °C for 24h. The measured concentrations were 387.0, 395.0 and 393.2 g/L. The average waters solubility was 391.7 g/l, with standard deviation of 4.2 (RSD%= 1%). The water solubility corrected for purity of 88% was 345 g/l.

Two samples were prepared and stirred at 80 °C for 24 hours. The samples were equlibrated at 20 °C for 24h. The measured concentrations were 812.8 and 916.8 g/L. The average waters solubility was 864.8 g/l, with standard deviation of 73.6 (RSD%= 9%).The water solubility corrected for purity of 88% was 791 g/l. The observed higher water solubility at high temperature appears to be irreversible after equilibration at 20 °C for 24h.

A blank was prepared and stirred at 30 °C for 72 hours. The measured pH was 4.82 for the blank, and the water solubility of the blank was < 10 g/l.

Any other information on results incl. tables

Table 1: Water solubility of MV31 K salt at different stirring times

Experiment

A

B

C

Amount of test substance (g)

 

10.07597

 

10.01520

 

 

10.01181

 

 

Stirring time

at 30 °C (h)

 

72

 

48

 

24

 

pH

 

7.64

 

7.62

 

7.59

 

Water solubility

(g/l)

 

393.2

 

395.0

 

387.0

 

Average

 

391.7

 

Standard deviation

4.2

 

% RSD

1%

Water solubility corrected for purity (g/l)

 

345

Table 2: Water solubility of MV31 K salt at stirring temperature of 80 °C

Experiment

E

F

Amount of test substance (g)

 

39.10

 

40.64

 

 

 

Stirring time

at 80 °C (h)

 

24

 

24

 

pH

 

8.46

 

8.46

 

Water solubility

(g/l)

 

812.8

 

916.8

 

Average

 

864.8

 

Standard deviation

73.6

 

% RSD

 

9%

Water solubility corrected for purity (g/l)

 

761

Applicant's summary and conclusion

Conclusions:
Interpretation of results (migrated information): miscible
The water solubility was 345 g/l (corrected for purity) for a stirring temperature of 30°C and equilibration temperature of 20°C.


Executive summary:

The solubility of MV 31 K salt in water was determined using the flask method according to EU guideline 95/69/EEC part A.6. water solubility; flask method and conducted under GLP compliance.

Three samples were prepared by adding weighed amounts of test substance to 20 mL distilled water and stirred for 24, 48, or 72 hours at 30 °C. The samples were equilibrated for 24 hours at 20 °C. Aliquots of the saturated aqueous phase were taken and centrifuged at 5000 rpm for 30 minutes at 20 °C. An aliquot of the centrifuged sample was diluted with 40:60 (v/v) acetonitrile/water and filled up to a volume. The concentration of the test substance was determined by HPLC. The water solubility was 345 g/l (corrected for purity) for a stirring temperature of 30°C and equilibration temperature of 20°C. The RSD% was 1%.

Due to the product process which is carried out at elevated temperature and leads to higher water solubility, an additional experiment was conducted. Two samples were prepared and stirred at 80 °C for 24 hours and equilibrated at 20 °C for 24h. The water solubility was 791 g/l (corrected for purity) for a stirring temperature of 80°C and equilibration temperature of 20°C, the RSD% was 9%.

This is a guideline study conducted under GLP with no deviation. Therefore, it is considered reliable without restriction and given a klimisch 1 reliability.