Registration Dossier

Administrative data

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Already evaluated by the Competent Authorities for Biocides and Existing Substance Regulations.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2004

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
Chemical structure
Reference substance name:
Copper(II) carbonate--copper(II) hydroxide (1:1)
EC Number:
235-113-6
EC Name:
Copper(II) carbonate--copper(II) hydroxide (1:1)
Cas Number:
12069-69-1
Molecular formula:
CuCO3.Cu(OH)2
IUPAC Name:
copper(II) carbonate, basic

Results and discussion

Water solubilityopen allclose all
Water solubility:
>= 0.002 - <= 0.005 g/L
Temp.:
20 °C
pH:
>= 6.2 - <= 6.8
Remarks on result:
other: Ambient pH result: A decreasing concentration in water solubility with time was noted, possibly due to precipitation of the Cu ions as the carbonate or hydroxide salt. Samples tested at 30+/- 0.5°C and 10°C +/- 0.5°C showed no temperature dependce.
Water solubility:
>= 1.16 g/L
Temp.:
20 °C
pH:
>= 5.6 - <= 5.8
Remarks on result:
other: Acidic pH result: Solubility of the test material was dependent on the acid availability.
Water solubility:
< 0 g/L
Temp.:
20 °C
pH:
>= 8.7 - <= 8.8
Remarks on result:
other: Basic pH result.

Applicant's summary and conclusion

Conclusions:
Interpretation of results (migrated information): slightly soluble (0.1-100 mg/L)
An increase of the pH of the sample solution was noted as the test material degraded to soluble copper salts. This neutralised the acid, resulting in saturation due to the insolubility of the test material at ambient pH. Further solubility could be achieved by increasing the acidic pH of the sample solution.
Executive summary:

At ambient pH solubility was shown to be: 4.68 x 10-3to 1.59 x 10-3g/l at 20 ± 0.5 °C (pH: 6.2 -6.8). An increase of the pH of the

sample solution was noted as the test material degraded to soluble copper salts. This neutralised the acid, resulting in saturation due

to the insolubility of the test material at ambient pH. Further solubility could be achieved by increasing the acidic pH of the sample solution.