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Diss Factsheets

Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
September 2018 - May 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
Version / remarks:
2000
Qualifier:
according to guideline
Guideline:
other: Commission Regulation (EU) No 283/2013 in accordance with Regulation (EC) No 1107/2009
Version / remarks:
2013
Qualifier:
according to guideline
Guideline:
other: US EPA OCSPP Guideline No. 835.1230
Version / remarks:
2008
GLP compliance:
yes (incl. QA statement)
Type of method:
batch equilibrium method
Media:
soil

Test material

Constituent 1
Chemical structure
Reference substance name:
3,5-bis(difluoromethyl)-1H-pyrazole
EC Number:
814-072-3
Cas Number:
77614-79-0
Molecular formula:
C5H4F4N2
IUPAC Name:
3,5-bis(difluoromethyl)-1H-pyrazole
Radiolabelling:
yes

Study design

Test temperature:
19.68 - 20.18 °C

Batch equilibrium or other method

Analytical monitoring:
yes
Details on sampling:
- Concentrations: Nominal test item concentrations of 2.0, 1.0, 0.2, 0.1 and 0.02 mg/L
- Sampling interval: 6, 24 and 48 h
- Sample storage before analysis: Stabilized supernatant and soil extracts were stored at <= -18 °C in the dark for 7 days .
Matrix propertiesopen allclose all
Matrix no.:
#1
Matrix type:
loamy sand
% Clay:
6
% Silt:
16
% Sand:
78
% Org. carbon:
1.5
pH:
5.4
CEC:
7.6 meq/100 g soil d.w.
Bulk density (g/cm³):
1.21
Matrix no.:
#2
Matrix type:
clay loam
% Clay:
28
% Silt:
38
% Sand:
34
% Org. carbon:
4.9
pH:
7.3
CEC:
18.7 meq/100 g soil d.w.
Bulk density (g/cm³):
0.98
Matrix no.:
#3
Matrix type:
silt loam
% Clay:
16
% Silt:
58
% Sand:
26
% Org. carbon:
1.8
pH:
6
CEC:
10.7 meq/100 g soil d.w.
Bulk density (g/cm³):
1.11
Matrix no.:
#4
Matrix type:
silt loam
% Clay:
16
% Silt:
56
% Sand:
28
% Org. carbon:
2.6
pH:
5.2
CEC:
10 meq/100 g soil d.w.
Bulk density (g/cm³):
0.99
Matrix no.:
#5
Matrix type:
sandy loam
% Clay:
11.5
% Silt:
33.1
% Sand:
55.4
% Org. carbon:
1.06
pH:
7.3
CEC:
4.2 meq/100 g soil d.w.
Bulk density (g/cm³):
1.167
Details on matrix:
IDENTIFICATION
Soil ID and Geographic location:
#1 - AX - Monheim, Germany
#2 - DD - Blankenheim, Germany
#3 - HH - Burscheid, Germany
#4 - HN - Bruscheid, Germany
#5 - 5M - Mechtersheim, Germany


COLLECTION AND STORAGE

- Sampling depth (cm): 0 - 20 cm
- Storage conditions: romm temperature
- Storage length: max. 2.5 years
- Soil preparation (e.g.: 2 mm sieved; air dried etc.): 2 mm sieved and air dried after collection, sterlizied via gamma ray treatment prior use

Details on test conditions:
TEST CONDITIONS
- Buffer:aqueous 0.01 M CaCl2 solution
- pH: aqueous 0.01 M CaCl2 solution without soil: 6.73
- Shaking conditions approx. 150rpm
- Light conditions: dark

TEST SYSTEM
- Type, size and further details on reaction vessel: Glass flasks with screw caps
- Water filtered (i.e. yes/no; type of size of filter used, if any): no
- Amount of soil/sediment/sludge and water per treatment (if simulation test): 10 g dry weight equivalents per replicate
- Soil/sediment/sludge-water ratio (if simulation test): 1/1 , 1/2, 1/5
- Number of reaction vessels/concentration: 2
- Test performed in closed vessels due to significant volatility of test substance: closed vessel
- Method of preparation of test solution:245 µL stock solution was dissolved in 4255 µL acetonitrile/water (10/90, v/v) resulting in an application solution with a concentration of 0.84 MBq/mL (equal to 210.606 mg/L using a specific activity of 3.99 MBq/mg) - Are the residues from the adsorption phase used for desorption: No
Duration of adsorption equilibrationopen allclose all
Sample No.:
#1
Duration:
24 h
Remarks:
AX
Sample No.:
#2
Duration:
24 h
Remarks:
DD
Sample No.:
#3
Duration:
24 h
Remarks:
HH
Sample No.:
#4
Duration:
24 h
Remarks:
HN
Sample No.:
#5
Duration:
6 h
Remarks:
5M

Results and discussion

Adsorption coefficientopen allclose all
Sample No.:
#1
Type:
Koc
Value:
9.4 L/kg
pH:
5.4
Temp.:
19.68 °C
Matrix:
loamy sand
% Org. carbon:
1.5
Remarks on result:
other: Matrix #1
Sample No.:
#2
Type:
Koc
Value:
7.5 L/kg
pH:
7.3
Temp.:
19.68 °C
Matrix:
clay loam
% Org. carbon:
4.9
Remarks on result:
other: Matrix #2
Sample No.:
#3
Type:
Koc
Value:
9.2 L/kg
pH:
6
Temp.:
19.68 °C
Matrix:
silt loam
% Org. carbon:
1.8
Remarks on result:
other: Matrix #3
Sample No.:
#4
Type:
Koc
Value:
10.9 L/kg
pH:
5.2
Temp.:
19.68 °C
Matrix:
silt loam
% Org. carbon:
2.6
Remarks on result:
other: Matrix #4
Sample No.:
#5
Type:
Koc
Value:
7.5 L/kg
pH:
7.3
Temp.:
19.68 °C
Matrix:
sandy loam
% Org. carbon:
1.06
Remarks on result:
other: Matrix #5
Sample No.:
#1
Type:
other: Kfoc
Value:
9 L/kg
pH:
5.4
Temp.:
19.68 °C
Matrix:
loamy sand
% Org. carbon:
1.5
Remarks on result:
other: Matrix #1
Sample No.:
#2
Type:
other: Kfoc
Value:
8.3 L/kg
pH:
7.3
Temp.:
19.68 °C
Matrix:
clay loam
% Org. carbon:
4.9
Remarks on result:
other: Matrix #2
Sample No.:
#3
Type:
other: Kfoc
Value:
9.4 L/kg
pH:
6
Temp.:
19.68 °C
Matrix:
silt loam
% Org. carbon:
1.8
Remarks on result:
other: Matrix #3
Sample No.:
#4
Type:
other: Kfoc
Value:
13.6 L/kg
pH:
5.2
Temp.:
19.68 °C
Matrix:
silt loam
% Org. carbon:
2.6
Remarks on result:
other: Matrix #4
Sample No.:
#5
Type:
other: Kfoc
Value:
6.7 L/kg
pH:
7.3
Temp.:
19.68 °C
Matrix:
sandy loam
% Org. carbon:
1.06
Remarks on result:
other: Matrix #5

Results: Batch equilibrium or other method

Mass balance (%) at end of adsorption phaseopen allclose all
Sample no.:
#1
Duration:
24 h
% Adsorption:
98.6
Sample no.:
#2
Duration:
24 h
% Adsorption:
100
Remarks on result:
other: 101.4 %
Sample no.:
#3
Duration:
24 h
% Adsorption:
99.3
Sample no.:
#4
Duration:
24 h
% Adsorption:
96.4
Sample no.:
#5
Duration:
6 h
% Adsorption:
100
Remarks on result:
other: 100.2 %
Transformation products:
no

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The adsorption constants KF of the test item for the tested soils calculated based on the Freundlich isotherms ranged 0.0715 to 0.4057 mL/g (arithmetic mean: 0.2273 mL/g). The respective KFoc values ranged from 6.7 to 13.6 mL/g (arithmetic mean: 9.4 mL/g).