Registration Dossier

Administrative data

Endpoint:
adsorption / desorption
Remarks:
adsorption/desorption
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Data in accordance with modern guidelines and described in sufficient detail

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1999
Report Date:
1999

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: EPA 163-1 Leaching and Adsorption/desorption studies
GLP compliance:
yes
Type of method:
batch equilibrium method
Media:
soil

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
3849 Kbq/mg, radiochemical purity >99% (HPLC), stored frozen
Radiolabelling:
yes

Study design

Test temperature:
Soil ratio 3/5, Test concentrations of 4.77, 0.96, 0.10 and 0.01 micrograms/L, 20 degrees C in the dark.

Results and discussion

Adsorption coefficientopen allclose all
Type:
Koc
Value:
35.9
Temp.:
20 °C
% Org. carbon:
1.67
Type:
Koc
Value:
32
Temp.:
20 °C
% Org. carbon:
0.88
Type:
Koc
Value:
37
Temp.:
20 °C
% Org. carbon:
1.36
Type:
Koc
Value:
22.9
Temp.:
20 °C
% Org. carbon:
2.47

Results: Batch equilibrium or other method

Mass balance (%) at end of adsorption phaseopen allclose all
Sample no.:
#1
Duration:
24 h
% Adsorption:
23.3 - 35
Sample no.:
#2
Duration:
24 h
% Adsorption:
13.4 - 16.7
Sample no.:
#3
Duration:
24 h
% Adsorption:
21.4 - 29
Sample no.:
#4
Duration:
24 h
% Adsorption:
23.4 - 32.8
Transformation products:
not specified

Applicant's summary and conclusion

Validity criteria fulfilled:
yes