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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: GLP-compliant, guideline study. Fully adequate for assessment.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report Date:
2013

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: OECD Series on Testing and Assessment No. 29
Deviations:
no
GLP compliance:
yes
Remarks:
With the exception of the ICP-MS and TOC analysis
Type of study / information:
Transformation/dissolution results

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
other: wire
Details on test material:
-Test item name: Silver wire
- CAS number: 7440-22-4
- ECTX-Consult number: T0105/01
- Purity: 99.99%
- Form: Solid wire (38mm by 2 mm diameter)
- Surface area: 3.14 mm2 (surface of 1 wire end), 9.42 mm2 (surface of 3 wire ends), 28.3 mm2 (surface of 9 wire ends)
- Relative density: 10.49
- Storage conditions: Room temperature in the dark
- Expiry date: Stable over time

Results and discussion

Any other information on results incl. tables

Summarised results of the measured silver concentrations on days 7 and 28 - transformation/dissolution of silver wire (massive) at 100 rpm at pH 8.

 

 

7 d

28 d

Loading (mg/L)

X ± S (µg/L)

CV (%)

X ± S (µg/L)

CV (%)

3

<0.02

-

<0.02

-

9

<0.02

-

<0.02

-

27

<0.02

-

0.03 ± 0.07

237

Applicant's summary and conclusion

Conclusions:
Concentrations of silver were below or close to the detection limit of 0.02 µg/L Ag during the 28 days at pH 8 of the test for surface equivalent loading of 3 and 9 mg/L silver wire (massive) as well as the second two replicates with surface equivalent loading of 27 mg/L. However, a steady increase of dissolved silver concentration could be observed in the first replicate during the last three weeks of testing (average of 0.11 ± 0.01 µg/L Ag, CV: 6%).
Executive summary:

The Transformation/Dissolution of silver wire (massive) at pH 8 was determined following OECD guideline 29. Loading of 3, 9 and 27 mg/L Ag surface equivalent were exposed to aqueous test medium for 28 days and the dissolved silver concentration was determined by ICP-MS analysis.