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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: 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

Constituent 1
Reference substance name:
Matte leaching residue
IUPAC Name:
Matte leaching residue
Details on test material:
Batch: 2010/086 Ex LONMIN
Sampling date: na
Manufacturer: Johnson Matthey Plc
Active ingredients: silver, arsenic, copper, nickel and lead.
Physical form: solid (powder)
Colour: grey
Storage: room temperature; in the dark
Expiry date: 01/01/2020
Safe handling precautions: May cause substances which are carcinogenic through inhalation; Limit dust exposure to the maximal extend and avoid breathing potential dust; Wear gloves when handling to prevent dermal exposure; Eliminate waste which was in contact with the material as hazardous waste and in safe and closed conditions

Results and discussion

Any other information on results incl. tables

The blank values of silver, arsenic, copper, nickel, lead in the test medium at pH 6 and 8 were below the detection limit.

pH 6

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

In the blank corrected test item vessels @ 100rpm at pH 6 all metals showed average dissolution concentrations above the detection limit. For the metalarsenica very small amount of 0.39 µg As/L was measured with a coefficient of variation of 4%. Larger amounts of silver (20.2 µg Ag/L) and nickel (70.0 µg Ni/L) were detected with a coefficient of variation of respectively 7% and 2%. The most important metals detected were copper and lead with an average concentration of 258 µg Cu/L and 694 µg Pb/L, respectively. The coefficients of variation for these values were 2% and 2%. All coefficients of variation fall under the quality criterion of 20%.

pH 8

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

In the blank corrected test item vessels @ 100rpm at pH 8 all metals showed average dissolution concentrations above the detection limit. For the metal arsenic a very low amount of 0.66 µg As/L was measured with a coefficient of variation of 12%. Larger amounts of silver (11.3 µg Ag/L), nickel (69.0 µg Ni/L) and copper (86.9 µg Cu/L) were detected with coefficient of variation of respectively 6%, 2% and 3%. The most important metal detected in this test medium was lead with an average concentration of 157 µg Pb/L and a coefficient of variation of 2%. All coefficients of variation fall under the quality criterion of 20.

Applicant's summary and conclusion

Conclusions:
In both test media (pH 6 and pH 8), all elements (silver, arsenic, copper, nickel and lead) show a dissolution concentration above the limit of detection, with significantly higher concentrations of arsenic, lead and silver at pH 6. The results can be assumed reliable because the test conditions stayed constant during the experiment.
Executive summary:

In both test media (pH 6 and pH 8), all elements (silver, arsenic, copper, nickel and lead) show a dissolution concentration above the limit of detection, with significantly higher concentrations of arsenic, lead and silver at pH 6. 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.

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