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Environmental fate & pathways

Additional information on environmental fate and behaviour

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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: Standard guideline, follows principles of GLP, 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

Constituent 1
Reference substance name:
Dore
EC Number:
273-793-6
EC Name:
Dore
Cas Number:
69029-47-6
Molecular formula:
Not available
IUPAC Name:
dioxocopper antimony arsenic gold selenium silver tellurium λ²-plumbane
Constituent 2
Reference substance name:
Doré (pure)
IUPAC Name:
Doré (pure)
Details on test material:
Batch: 881929
Sampling date: 17/02/2010
Manufacturer: Aurubis AG
Active ingredients: Silver, arsenic, copper, nickel, lead, antimony and zinc
Physical form: Solid (tiny pieces <1mm)
Colour: Metallic, silver
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

The determination of the metals in the test medium at pH 6 showed a measurable concentration for zinc (2.50 μg Zn/L) probably caused by the used buffering system. This value was also measured in the blank control samples at pH 6 and therefore has been subtracted from the zinc values measured in the test item vessels.

pH 6

In the test item vessels of the 24 hour pre-test at 100 rpm at pH 6, no amounts of dissolved arsenic, nickel, antimony and zinc have been detected.

For the metal silver a very small amount of 0.03 μg Ag/L was detected with a variation coefficient of 30%. The measured value is so small it can be considered that this metal has not been dissolved in the test medium.

The average concentration of lead measured in the test medium was 0.39 μg Pb/L with a variation coefficient of 14%.

An average value of 76.1 μg Cu/L was obtained with a variation coefficient of 20%. This between test item vessel variation falls just within the quality criterion of 20%.

pH 8

In the test item vessels of the 24 hour pre-test at 100 rpm at pH 8, no amounts of dissolved silver, arsenic, nickel, lead, antimony and zinc have been detected. However, in replicate 4, an average value of 0.38 μg Ni/L with a variation coefficient of 70% have been calculated.

An average value of 38.6 μg Cu/L was obtained with a variation coefficient of 10%. This value is significantly lower than the value measured in the 24 hout pre-test at 100 rpm at pH 6.

Applicant's summary and conclusion

Conclusions:
The worst case pH defined in this test is pH 6. Silver, copper and lead are the only elements which showed dissolution above detection limit 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.
Executive summary:

The worst case pH defined in this test is pH 6. Silver, copper and lead are the only elements which showed dissolution above detection limit 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 and acceptable for use for this endpoint.