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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:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report Date:
2010

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: OECD guideline for testing of chemicals - draft proposal - February 2001. Transformation dissolution of metals and metal compounds in aqueous media.
Deviations:
yes
Remarks:
refinements agreed by the ad hoc OECD validation management group (VMG).
GLP compliance:
no
Type of study / information:
Transformation and dissolution.
The aim of this project is to carry out the standard Transformation / Dissolution test at 1, 10 and 100 mg/L loading, to metallic tin powder, and study the stability of tin solutions after the transformation / dissolution tests have been completed, for a further 7-day period.

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Test material: Metallic Tin powder
Powder size classification: Type 5
CAS #: 7440-31-5

Results and discussion

Any other information on results incl. tables

Transformation / Dissolution test.

Table 1. Metallic tin powder: summary of the transformation / dissolution results for 7 days at 1, 10 and 100 mg/L, and 28 days at 1 mg/L loading.

Test material CAS #

TDp: Time and Loading results

(µg Sn/L)

168h 672h
1 mg/L 10 mg/L 100 mg/L 1 mg/L
Metallic Tin Powder 7440-31-5 7 20 31 7

Raw data of the individual measurements performed for the tin powder submitted to the T/D protocol in a modified OECD 203 media, at pH 8.5 are presented in Tables 3-5 (attached).

Stability test.

After the Transformation / dissolution tests had finished, the OECD media were filtered through 0.2 μm PTFE membranes, and the stability of the dissolved tin was followed for 7 days. Total and dissolved tin concentrations were measured after 24, 48, 72 and 168 hours of incubation at 20 °C, without agitation.

Table 2. Stability of dissolved tin: summary of the results for 7 days incubation of tin solutions coming from the transformation / dissolution tests at 1, 10 and 100 mg/L sample loading.

Sample loading Species Tin concentration (µg/L)
24 h 48 h 72 h 168 h
1 mg/L, 28 days T/D Dissolved 6 6 6 6
1 mg/L, 28 days T/D Total 6 6 6 6
10 mg/L, 7 days T/D Dissolved 22 21 22 22
10 mg/L, 7 days T/D Total 21 21 21 21
100 mg/L, 7 days T/D Dissolved 18 18 17 17
100 mg/L, 7 days T/D Total 18 16 17 17

Raw data of the individual measurements performed for the tin powder in the stability test are presented in Tables 6 -8 (attached).

Applicant's summary and conclusion

Conclusions:
Test concentrations of 1, 10 and 100 mg/L achieved transformation/dissolution levels of 7, 20 and 31 µg Sn/L respectively at 168 hours. A single test concentration of 1 mg/L tested for 672 hours achieved 7 µg/L transformation/dissolution.
Executive summary:

Tin metal powder (type 5) was tested largely in accordance with the general guidance given in the draft OECD Transformation/Dissolution protocol. The experimental design includes the refinements, agreed by the ad hoc OECD Validation Management Group (VMG), as described in the Standard Operating Procedures prepared by CANMET and LISEC. Full transformation / dissolution tests, at pH 8.5, were performed at the 3 recommended sample loadings (1, 10 and 100 mg/L) of the smallest representative, commercially available, tin powder for the 7 day acute test and 1 mg/L loading for the 28 day chronic test.

Test concentrations of 1, 10 and 100 mg/L achieved transformation/dissolution levels of 7, 20 and 31 µg Sn/L respectively at 168 hours. A single test concentration of 1 mg/L tested for 672 hours achieved 7 µg/L transformation/dissolution.