Matte, precious metal

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:

Matte, precious metal

EC Number:

308-506-6

EC Name:

Matte, precious metal

Cas Number:

98072-52-7

IUPAC Name:

diiron(3+) copper(2+) lambda2-cobalt(2+) lambda2-iron(2+) lambda2-lead(2+) disilver(1+) (trinickel-1-ylidene)-1lambda4-disulfene tellurium octasulfanediide

Details on test material:

Batch: 881929
Sampling date: 29/01/2010
Manufacturer: Unicore Precious Metals
Active ingredients: silver, nickel, copper, arsenic, chromium, lead and cobalt.
Physical form: solid (powder)
Colour: dark grey
Storage: room temperature; in the dark
Expiry date: 29/01/2011
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, cobalt, chromium, copper, nickel and lead in the test medium at pH 6 and 8 were below the detection limit.

pH 6

In the blank corrected test item vessels 24-h pre-test @ 100rpm at pH 6 the concentrations of dissolved silver, arsenic and chromium were below the limit of detection. A very small amount of cobalt was measured, 0.06 µg Co/L with a variation coefficient of 3%. The average concentrations of copper and nickel measured in the test medium are 0.42 µg Cu/L and 0.30 µg Ni/L with a coefficient of variation of respectively 7% and 3%. Significant amounts of lead went into solution. An average value of 570 µg Pb/L was obtained with a variation coefficient of 4%. All the between test item vessel variations fulfil the quality criterion of <20%. One measuring value for copper was considered as outlier and therefore not used in further calculations. The value could not be confirmed by replica measurements.

pH 8

In the blank corrected test item vessels 24-h pre-test @ 100rpm at pH 8 the concentrations of dissolved silver, arsenic, chromium and copper were below the limit of detection. An average value of 1.66 µg Co/L was measured with a coefficient of variation of 70%. There is no explanation for this large within- and between vessel variations. An average value of 0.38 µg Ni/L was measured with a coefficient of variation of 24%. This between vessel variation falls slightly out of the quality criterion of 20%, which may be due to the accurately measured concentrations near the limit of detection. One measuring value for nickel was considered as outlier and therefore not used in further calculations. The value could not be confirmed by replica measurements. A significant amount of lead was found in the test vessels: 140 µg Pb/L with a between vessel variation of 5%. This value is significant lower than the value measured in 24-h pre-test @ 100rpm 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 an acceptable for use for this endpoint.