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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:
Waste solids, precious metal refining
EC Number:
308-526-5
EC Name:
Waste solids, precious metal refining
Cas Number:
98072-70-9
IUPAC Name:
Waste solids, precious metal refining
Details on test material:
Batch: 18053
Sampling date: na
Manufacturer: Johnson Matthey Plc
Active ingredients: silver, antimony, cadmium, chromium, cobalt, copper, lead, nickel, and zinc.
Physical form: solid (powder)
Colour: greyish-white
Relative density: 3.64
Storage: room temperature; in the dark
Expiry date: 01/01/2020
Safe handling precautions: A Johnson Matthey Safety Data Sheet on Spent Catalyst on a Mixed Support is available.

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. For antimony a blank value of 0.05 µg Sb/L was measured in the test medium at pH 6 which was a little bit higher than the detection limit. However, there was a significant blank value for zinc (±2.5 µg/L) for the test medium at pH 6. Taking into account that the test medium at pH 6 and pH 8 are prepared from the same batch of ultra pure water we assume that this blank value for zinc can only come from the buffering system used. This observation does not cause a problem because the results for the blank were consistent and didn’t have an influence on the integrity of the study taking into account that the results for the blank corrected zinc were below the limit of detection of 0.2 µg/L.

pH 6

In the blank control vessels 24-h pre-test @ 100rpm at pH 6 no detectable values for silver, cadmium, cobalt, chromium, copper, nickel and lead have been measured. A small amount of 0.04 µg Sb/L was measured for antimony while a blank value of 2.65 µg Zn/L was detected for zinc. These blank values have been subtracted from the amounts measured in the test item vessels of pH 6.

In the blank corrected test item vessels 24-h pre-test @ 100rpm at pH 6 no cadmium have been measured. Low amounts of cobalt(0.08 µg Co/L) and antimony (0.69 µg Sb/L) were measured with a coefficient of variation of 3% and 28% respectively. The coefficient of variation for antimony exceeded the 20% quality criterion probably due to the very low concentration values near the detection limit. Larger amounts of lead (1.85 µg Pb/L), copper (2.11 µg Cu/L), nickel (3.46 µg Ni/L), silver (4.58 µg Ag/L) and zinc(5.6 µg Zn/L) were measured with a coefficient of variation of respectively 10%, 10%, 7%, 6% and 19%. The most important metal detected in this test medium was chromium, with an average concentration of 24.3 µg Cr/L and a coefficient of variation of 2%.

pH 8

In the blank control vessels 24-h pre-test @ 100rpm at pH 8 no detectable values for the 9 metalshave been measured.

In the blank corrected test item vessels 24-h pre-test @ 100rpm at pH 8 no amounts of dissolved cadmium, copper and zinc have been measured. Low amounts of lead (0.80 µg Pb/L), antimony (0.98 µg Sb/L) and cobalt (1.30 µg Co/L) were measured with a coefficient of variation of respectively 26%, 42% and 27%. These coefficients of variation exceeded the 20% quality criterion probably due to the very low concentration values near the detection limit. Larger amounts of silver (5.72 µg Ag/L) and nickel(7.08 µg Ni/L) were detected with a coefficient of variation of 3% and 9%, respectively. The most important metal detected in the test medium at pH 6 was chromium, with an average concentration of 20.0 µg Cr/L and a coefficient of variation of 2%.

Applicant's summary and conclusion

Conclusions:
With exception of cadmium all elements in test medium at pH 6 showed concentrations above their detection limits. In test medium at pH 8 all elements, except cadmium, copper and zinc, show dissolved concentrations above their detection limits. The concentrations of chromium, copper, lead and zinc were slightly higher at pH 6 than at pH 8. The concentrations of silver, cobalt, nickel and antimony were slightly higher at pH 8.
Executive summary:

With exception of cadmium all elements in test medium at pH 6 showed concentrations above their detection limits. In test medium at pH 8 all elements, except cadmium, copper and zinc, show dissolved concentrations above their detection limits. The concentrations of chromium, copper, lead and zinc were slightly higher at pH 6 than at pH 8. The concentrations of silver, cobalt, nickel and antimony were slightly higher at pH 8.

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

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