Registration Dossier

Administrative data

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
01 and 04 April 2008
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affcet the quality of relevant results.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2008

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method A.6 (Water Solubility)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
Date of inspection: 21/08/07 Date of signature: 15/10/07
Type of method:
flask method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Details on test material:
Sponsor's identification : VCBK3810
Description : black powder
Lot number : N006746
Date received : 25 February 2008
Storage conditions : room temperature, in the dark

Results and discussion

Water solubility
Water solubility:
>= 0.012 - <= 0.038 g/L
Temp.:
20 °C
pH:
> 0

Any other information on results incl. tables

 Results:

 Preliminary test:

The preliminary estimate of water solubility was equivalent to 3.12 x 10-2 g/l of test material in solution for group 1 peaks and equivalent to 9.88 x 10-3g/l of test material in solution for group 2 peaks.


Definitive test:

The mean peak areas relating to the standard and sample solutions are shown in the following table:

Solution

Mean Area

Group 1

Group 2

Standard 20.2 mg/l

354.011

203.155

Standard 20.2 mg/l

355.629

204.823

Matrix blank

None detected

None detected

Sample 1A

312.480

57.017

Sample 1B

315.830

55.162

Sample 2A

368.077

66.179

Sample 2B

381.731

65.183

Sample 3A

317.232

56.500

Sample 3B

315.061

51.841

The equivalent concentration (g/l) of test material in the sample solutions is shown in the following table:

Sample Number

Time Shaken at

~ 30ºC (hours)

Time Equilibrated

at 20ºC (hours)

Concentration (g/l)

Solution pH

Group 1

Group 2

1

24

24

3.58 x 10-2

1.11 x 10-2

6.5

2

48

24

4.27 x 10-2

1.30 x 10-2

6.1

3

72

24

3.60 x 10-2

1.07 x 10-2

5.9

Group 1 mean equivalent concentration:           3.81 x 10-2 g/l at 20.0 ± 0.5ºC
Group 1 range:                                  
        3.58 x 10-2 to 4.27 x 10-2 g/l

Group 2 mean equivalent concentration:           1.16 x 10-2 g/l at 20.0 ± 0.5ºC
Group 2 range:                                     1.07 x 10
-2 to 1.30 x 10-2 g/l

 

 Validation:

The linearity of the detector response with respect to concentration was assessed over the nominal concentration range of 0 to 50 mg/l. This was satisfactory with a correlation coefficient of greater then or equal to 0.997 being obtained for the two groups monitored.

Discussion:

In the absence of definitive purity values for the test material, all calculated concentration values have been reported as equivalent test material concentrations. That is, the concentration calculated for any individual group/component is equivalent to that specified concentration of test material having been successfully dissolved. The test material has been quantified separately for the two distinct groups of peaks eluting at approximately 5 minutes and 10 minutes respectively.

It is evident from the information obtained in the hydrolysis study (see Section 10) and data relating to the pH of the test material in water that negligible hydrolysis of the sample solution occurred during the course of the water solubility test.

Applicant's summary and conclusion

Conclusions:
Interpretation of results (migrated information): slightly soluble (0.1-100 mg/L)
The water solubility of the test material has been determined to be equivalent to 3.81 x 10-2 g/l of test material in solution at 20.0 ± 0.5°C, monitoring components in the first eluting group, and equivalent to 1.16 x 10-2 g/l of test material in solution at 20.0 ± 0.5°C, monitoring components in the second eluting group.
Executive summary:

Water Solubility: Equivalent to 3.81 x 10-2 g/l of test material in solution at 20.0 ± 0.5°C, monitoring components in the first eluting group, and equivalent to 1.16 x 10-2g/l of test material in solution at 20.0 ± 0.5°C, monitoring components in the second eluting group, using the flask method, Method A6 of Commission Directive 92/69/EEC.