Silver

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: 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

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

Test material information

Constituent 1

Reference substance name:

Silver

EC Number:

231-131-3

EC Name:

Silver

Cas Number:

7440-22-4

Molecular formula:

Ag

IUPAC Name:

silver

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.