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Diss Factsheets

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:
2009

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
GLP compliance:
yes
Type of method:
batch equilibrium method
Media:
soil

Test material

Constituent 1
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: 945-0101

RADIOLABELLING INFORMATION (if applicable)
- Radiochemical purity: 99.8 %
- Specific activity: 12 MBq/mg
Radiolabelling:
yes

Study design

Test temperature:
20 °C

Batch equilibrium or other method

Analytical monitoring:
yes
Details on sampling:
- Concentrations: 1.0, 0.5, 0.1, 0.05 and 0.01 mg/L
- Soil/Solution ratio: 1/1
- Sampling interval: The tubes were agitated for 48 hours in the dark at 20°C. After incubation, tubes were centrifuged at and the radioactivity of samples was determined by liquid scintillation spectrometers. HPLC was performed on adsorption supernatants.
Matrix propertiesopen allclose all
Matrix no.:
#1
Matrix type:
sand
% Org. carbon:
0.52
pH:
5.2
Matrix no.:
#2
Matrix type:
sandy loam
% Org. carbon:
2.74
pH:
5.6
Matrix no.:
#3
Matrix type:
loamy sand
% Org. carbon:
0.88
pH:
5.9
Matrix no.:
#4
Matrix type:
silt loam
% Org. carbon:
0.9
pH:
6.3
Matrix no.:
#5
Matrix type:
silt loam
% Org. carbon:
1.63
pH:
6.5
Matrix no.:
#6
Matrix type:
sandy loam
% Org. carbon:
1.09
pH:
6.9
Matrix no.:
#7
Matrix type:
silty clay loam
% Org. carbon:
3.84
pH:
7.5
Matrix no.:
#8
Matrix type:
sandy loam
% Org. carbon:
0.41
pH:
7.6
Details on matrix:
COLLECTION AND STORAGE

- Soil preparation (e.g.: 2 mm sieved; air dried etc.): Soils were air dried at room temperature and passed through a 2 mm screen prior to use.


Details on test conditions:
TEST SYSTEM
- Type, size and further details on reaction vessel: 5 mL Luer lock syringes, each prepared with a 20 urn disposable
frit and closed with a cock
- Amount of soil/sediment/sludge and water per treatment (if simulation test): tubes were filled with 2 g of soil and ml application solution was pipetted onto the soil.
- Number of reaction vessels/concentration: 2
- Method of preparation of test solution: A stock solution of 1.23849 mg of the 1 4C-labelled test item in 10 mL of acetonitrile was prepared. To create application solution A, 0.81 mL of the stock solution was dried under a nitrogen stream and dissolved in 100 mL of 0.01 M aqueous CaCI2.Further solutions were prepared by diluting of solution A with 0.01 M CaCl2

Results and discussion

Adsorption coefficientopen allclose all
Sample No.:
#1
Type:
Koc
Value:
4.2
pH:
5.2
Temp.:
20 °C
Matrix:
Sand
Sample No.:
#2
Type:
Koc
Value:
65.8
pH:
5.6
Temp.:
20 °C
Matrix:
Sandy loam
Sample No.:
#3
Type:
Koc
Value:
3.6
pH:
5.9
Temp.:
20 °C
Matrix:
Loamy sand
Sample No.:
#4
Type:
Koc
Value:
3.4
pH:
6.3
Temp.:
20 °C
Matrix:
Silt loam
Sample No.:
#5
Type:
Koc
Value:
6.7
pH:
6.5
Temp.:
20 °C
Matrix:
Silt loam
Sample No.:
#6
Type:
Koc
Value:
0.5
pH:
6.9
Temp.:
20
Matrix:
Sandy loam
Sample No.:
#7
Type:
Koc
Value:
0
pH:
7.5
Temp.:
20
Matrix:
Silty clay loam
Sample No.:
#8
Type:
Koc
Value:
0
pH:
7.6
Temp.:
20
Matrix:
Sandy loam

Applicant's summary and conclusion

Conclusions:
The adsorption behaviour of the test item was determined in five European soils,
two North American soils and one Japanese soil, which covered a range of pH from 5.2 to
7.6, a range of organic carbon content from 0.41% to 3.84%. The soils were classified by
USDA scheme into 5 different textural classes: 3 sandy loam, 2 silt loam, 1 loamy sand, 1
silty clay loam and 1 sand.
The Freundlich adsorption coefficients KF covered a range from 0 to 0.11 mL/g for seven
soils with a value of 1.8 for the Obihiro soil. The K F 0 C values ranged from 0 mL/g to 6.7 mL/g,
except for soil Obihiro the value was 65.8 mL/g. The overall mean Koc is 10.5 and the logKOC is 1.02. Thus, adsorption of the test item to solid soil phase is not expected.