Copper diformate

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2019-05-31 to 2019-07-26

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2020

Report date:

2020

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Version / remarks:

27 July 1995

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Version / remarks:

30 May 2008

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Test material

Test material information

Constituent 1

Reference substance name:

Copper diformate

EC Number:

208-865-8

EC Name:

Copper diformate

Cas Number:

544-19-4

Molecular formula:

CH2O2.1/2Cu

IUPAC Name:

copper diformate

Test material form:

solid: particulate/powder

Details on test material:

blue in color

Results and discussion

Water solubility

Key result

Water solubility:

ca. 98.6 g/L

Conc. based on:

test mat. (dissolved fraction)

Loading of aqueous phase:

600 g/L

Temp.:

20 °C

pH:

3.7 - 4

Any other information on results incl. tables

Visual

The water solubility in the visual preliminary test was observed to be in the range of 32.7 to 49.0 g/L.

Table 1: copper concentrations (mg/L) and the calculated test item concentrations (g/L)

Sample number	Time shaken at ~ 30 ºC (hours)	Copper concentration (mg/L)	Mean copper concentration (mg/L)	Mean test item concentration (g/L)	Solution pH
1A	72	3.259 x 10^4	3.258 x 10^4	97.2	3.7
1B	72	3.256 x  10^4
2A	48	3.407 x 10^4	3.405 x 10^4	102	4.0
2B	48	3.402 x 10^4
3A	24	3.254 x 10^4	3.250 x 10^4	97.0	3.8
3B	24	3.246 x 10^4

On completion of the equilibration period, the samples were clear, blue solutions with excess test item present at the bottom of the test vessels. The solutions were decanted, avoiding excess test item prior to centrifugation. After centrifugation, the supernatant was taken for analysis. The supernatant was visually observed to be clear/blue and free from undissolved test item.

As the water solubility was determined during the preliminary test to be above 10-2 g/L, the flask shaking test was performed.

All individual water solubility results were within ± 15% of the mean, thus satisfying the criteria specified in the guidelines.

Applicant's summary and conclusion

Conclusions:

The water solubility of the test item has been determined to be 98.6 g /L of solution at 20.0 ± 0.5 ºC.

Executive summary:

The water solubility of the test item has been determined to be 98.6 g/L of solution at 20.0 ± 0.5 °C, using the flask method, designed to be compatible with Method A.6 Water Solubility of Commission Regulation (EC) No. 440/2008 of 30 May 2008 and Method 105 of the OECD Guidelines for Testing of Chemicals, 27 July 1995.