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Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2014

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
Version / remarks:
2000
Deviations:
no
GLP compliance:
yes
Type of method:
batch equilibrium method
Media:
soil

Test material

Reference
Name:
Unnamed
Type:
Constituent
Specific details on test material used for the study:
- Batch No. 724-2102
- Expiry date: No data
- Radiochemical purity: 99.8%
Radiolabelling:
yes

Study design

Test temperature:
20 °C

Batch equilibrium or other method

Analytical monitoring:
yes
Details on sampling:
- A solution to soil ratio of 25:1 with an equilibration time of 4 hours was chosen.
- Concentrations: For the determination of the adsorption isotherm, five different concentrations (nominal 0.001, 0.01, 0.025, 0.05 and 0.1 µg/mL) of the test item in 0.01 mol/L CaCl2 solutions were used.
- Sample method: The adsorption behavior of the test substance was investigated using five European soils.
1 - Sampling interval: The adsorption equilibrium test was carried out with the test substance in all five soils and with 5 test intervals (2, 4, 8 and 24 hours), in duplicate.
- Sample storage before analysis: All samples were equilibrated in the dark at 20 ± 2 °C
Matrix propertiesopen allclose all
Matrix no.:
#1
Matrix type:
other: Bruch West
% Clay:
11.3
% Silt:
25.1
% Sand:
63.7
% Org. carbon:
1.63
pH:
7.3
CEC:
11.9 meq/100 g soil d.w.
Matrix no.:
#2
Matrix type:
other: Nierswalde Wildacker
% Clay:
8.8
% Silt:
73.5
% Sand:
17.7
% Org. carbon:
1.85
pH:
5.7
CEC:
3.1 meq/100 g soil d.w.
Matrix no.:
#3
Matrix type:
other: LUFA 2.1
% Clay:
2.3
% Silt:
6.9
% Sand:
90.8
% Org. carbon:
0.6
pH:
5.6
CEC:
-0.7 meq/100 g soil d.w.
Matrix no.:
#4
Matrix type:
other: LUFA2.3
% Clay:
8.3
% Silt:
23.1
% Sand:
68.6
% Org. carbon:
0.99
pH:
6.7
CEC:
7.5 meq/100 g soil d.w.
Matrix no.:
#5
Matrix type:
other: La Gironda
% Clay:
27.7
% Silt:
23
% Sand:
49.2
% Org. carbon:
1.22
pH:
7.4
CEC:
26.3 meq/100 g soil d.w.

Results and discussion

Adsorption coefficientopen allclose all
Sample No.:
#1
Type:
Koc
Value:
785 L/kg
pH:
5.6
Temp.:
20 °C
Matrix:
LUFA 2.1
% Org. carbon:
0.6
Sample No.:
#2
Type:
Koc
Value:
687 L/kg
pH:
5.7
Temp.:
20 °C
Matrix:
LUFA 2.3
% Org. carbon:
0.09
Key result
Sample No.:
#3
Type:
Koc
Value:
400 L/kg
pH:
7.3
Temp.:
20 °C
Matrix:
Bruch West
% Org. carbon:
1.63
Sample No.:
#4
Type:
Koc
Value:
830 L/kg
pH:
5.7
Temp.:
20 °C
Matrix:
Nierswalder Wildacker
% Org. carbon:
1.85
Sample No.:
#5
Type:
Koc
Value:
831 L/kg
pH:
7.4
Temp.:
20 °C
Matrix:
La Gironda
% Org. carbon:
1.22

Results: Batch equilibrium or other method

Transformation products:
yes

Applicant's summary and conclusion