Slimes and Sludges, precious metal refining

Additional information on environmental fate and behaviour

Administrative data

Endpoint:

additional information on environmental fate and behaviour

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Follows standard guideline, acceptable without restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: OECD Test Guideline No 29 (2001)

Deviations:

no

GLP compliance:

no

Remarks:

according to the principles of GLP

Type of study / information:

24-h transformation dissolution pre-test

Test material

Test material information

Constituent 1

Reference substance name:

Slimes and Sludges, precious metal refining

EC Number:

308-516-0

EC Name:

Slimes and Sludges, precious metal refining

Cas Number:

98072-61-8

IUPAC Name:

Slimes and Sludges, precious metal refining

Details on test material:

Test item (as identified in the report): Slime Gold electrolysis
Manufacturer: Aurubis AG
Active ingredients: silver, copper and lead
Physical form: solid (powder)
Colour: yellowish
Storage: room temperature; in the dark
Expiry date: stable over time
Safe handling precautions: usual personal protective equipment.

Results and discussion

Any other information on results incl. tables

In the test medium and the blank control vessels of the 24-h pre-test @ 100 rpm at pH 6 and pH 8 no detectable values for silver, copper and lead have been measured.

pH 6

In the blank corrected test item vessels 24-h pre-test @ 100rpm at pH 6 no copper was found. A small amount of lead 0.17 μg Pb/L was detected with a coefficient of variation of 6%. The average concentration of silver measured in the test vessels was 24.0 μg Ag/L with a coefficient of variation of 1%.

pH 8

n the blank corrected test item vessels 24-h pre-test @ 100rpm at pH 8 6 no copper or lead was detected. The average concentration of silver measured in the test vessels was 14.3 μg Ag/L with a variation coefficient of 7%.

The concentration of silver was significantly higher at pH 6 than at pH 8.

Applicant's summary and conclusion

Conclusions:

The worst case pH defined in this test is pH 6. Only silver released to an important dissolved concentration from the test item (Slime Gold electrolysis) and may be important in the design of a full test for classification purposes.

Executive summary:

The worst case pH defined in this test is pH 6. Only silver released to an important dissolved concentration from the test item (Slime Gold electrolysis) and may be important in the design of a full test for classification purposes. The results can be assumed reliable because the test conditions stayed constant during the experiment.

This study is considered reliable an acceptable for use for this endpoint.