Registration Dossier

Environmental fate & pathways

Additional information on environmental fate and behaviour

Administrative data

Endpoint:
additional information on environmental fate and behaviour
Type of information:
experimental study
Study period:
1988
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: no guideline followed, well documented study
Data waiving:
other justification
Justification for data waiving:
other:

Data source

Reference
Reference Type:
publication
Title:
A model of the exchange of inorganic chemicals between water and sediments
Author:
Diamond et al.
Year:
1990
Bibliographic source:
Environ. Sci. Technol., 1990, 24 (5), pp 713–722

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Enclosures (C1 (test & control), C2(test & control)) was installed in a lake. The diameter of the enlosures was 0.78m, the depth was 2m. The enclosures were between 10 and 16 cm in the sediment layer. At the beginn of the test radiolabeled stannous (as chloride) was added.
The radiactivity in the water column (filtered water and particulated matter)material > 0.4µm)) and in the sediment was measuered every two days. On day 21 the enclosure of C2 was open and the enclosure was flushed for three days with lake water, then the enclosure was closed again for measurement radilabeld stannous diffision and scour form sediment layer to the water column.
Via the concentration the partiion coeffivients and the half live time was determined
Whole timeframe of test: 75d
GLP compliance:
no
Type of study / information:
- partition coefficient suspended particle
- partition coefficient sediment trap
- half live time of stannous

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
stannous chloride with radiolabeld Sn

Results and discussion

Any other information on results incl. tables

Observed fractions of particles sorption and calculated mass partition coefficients (KPL/kg) and 95% confidence limit:

 

Percent particle sorbed

Kp

 

Suspended particle

Sediment trap

Isotope

C1

C2

Mean

95 % CL

Mean

95 % Cl

113Sn

90

80

2.9 *10^6

7.2x10^5 –

4.7 10^6

9.4x10^5

4.9x10^5 –

1.5x10^6

 

Half live time:

For C1 a half life time of 8.1 respective for C2 10.5 days was observed (according to a reaction of first order)

Applicant's summary and conclusion

Conclusions:
The half life time of stannous in the water column of the envrionment ist between 8.1 and 10.5 days (depending on the conditions of the water column). In due this half life time is lower than 80d the is no concern for bioaccumulation in the water colum.

The partion coefficient for suspended particcle was determined to be2.9x10°6 and for the sediment trap 9.4 x 10^5.