Copper iodide

Water solubility

Administrative data

Endpoint:

transformation / dissolution of metals and inorganic metal compounds

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: This is a GLP-compliant study that has been carried out in acordance with an internationally recognised guideline

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Series on Testing and Assessment No. 29 (23-Jul-2001): Guidance document on transformation/dissolution of metals and metal compounds in aqueous media

Deviations:

no

GLP compliance:

yes

Type of method:

flask method

Test material

Test material information

Constituent 1

Reference substance name:

Copper(I) iodide

IUPAC Name:

Copper(I) iodide

Details on test material:

- Name of test material (as cited in study report): Copper(I) iodide
- Analytical purity: 99.5%
- Lot/batch No.: 290911

Results and discussion

Solubility of metal ions in aqueous media

Solubility of metal ions in aqueous media 1

Type of test:

screening transformation/dissolution test - sparingly soluble metal compounds

Mean dissolved conc.:

>= 3 594 - <= 3 692 µg/L

Element analysed:

Copper

Loading of aqueous phase:

100 mg/L

Incubation duration:

24 h

Test conditions:

pH 6

Remarks on result:

other: an average dissolved copper concentration of 3643 +/- 49µg Cu/L was found

Solubility of metal ions in aqueous media 2

Type of test:

screening transformation/dissolution test - sparingly soluble metal compounds

Mean dissolved conc.:

>= 2 167 - <= 2 235 µg/L

Element analysed:

Copper

Loading of aqueous phase:

100 mg/L

Incubation duration:

24 h

Test conditions:

pH 8

Remarks on result:

other: an average dissolved copper concentration of 2201 +/- 34µg Cu/L was found

Any other information on results incl. tables

The pH measured in the medium at the start of the test, and in the blank and test item vessels during the test varied from 6.01 to 6.05. All measured data were within the specifications of pH 6 ± 0.2. For the test at pH 8 the pH moved from 7.95 at the start of the test to 7.29 after 24 hours of extraction and so didn’t meet the ± 0.2 criterion.

The measured TOC of the medium was below the reporting limit of the analytical laboratory ( <1 mg C/L), and so fulfilled <2 mg C/L criterion as laid down in the OECD Guidelines.

The temperature of the test solutions fluctuated between 21.5 and 22.8°C and corresponded to the required test conditions of 20 – 23°C.

The dissolved oxygen concentration measured in the blank and test item vessels varied from 8.39 to 8.48 mg O2/L. These values were higher than the target value of ± 6 mg O2/L at 22°C which means more than 70% of the saturation concentration was in contact with the air (± 8.5 mg O2/L).

The test medium at the start of the test and the blank control vessels during the test showed no significant concentrations of copper.

For the test at pH 6 at a loading of 100 mg/L Copper(I) iodide an average dissolved copper concentration of 3643 ± 49 µg Cu/L was found.

For the test at pH 8 at a loading of 100 mg/L Copper(I) iodide an average dissolved copper concentration of 2201 ± 34 µg Cu/L was measured.

Based on the results of the experiments we may conclude that pH 6 is the pH were the highest copper concentrations were measured.