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Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016
Report date:
2016

Materials and methods

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

Test material

Constituent 1
Chemical structure
Reference substance name:
2,4-difluoroaniline
EC Number:
206-687-5
EC Name:
2,4-difluoroaniline
Cas Number:
367-25-9
Molecular formula:
C6H5F2N
IUPAC Name:
2,4-difluoroaniline
Radiolabelling:
yes
Remarks:
Radiolabel: [phenyl-U-14C]

Study design

Batch equilibrium or other method

Analytical monitoring:
yes
Matrix propertiesopen allclose all
Matrix no.:
#1
Matrix type:
loamy sand
% Clay:
6.9
% Silt:
15.3
% Sand:
77.8
% Org. carbon:
1.42
pH:
5.27
CEC:
9.3 meq/100 g soil d.w.
Matrix no.:
#2
Matrix type:
sandy loam
% Clay:
6.6
% Silt:
36
% Sand:
57.4
% Org. carbon:
0.72
pH:
5.37
CEC:
7.8 meq/100 g soil d.w.
Matrix no.:
#3
Matrix type:
loam
% Clay:
23
% Silt:
43.9
% Sand:
33.1
% Org. carbon:
1.81
pH:
7.53
CEC:
31 meq/100 g soil d.w.

Results and discussion

Adsorption coefficientopen allclose all
Sample No.:
#1
Type:
Koc
Value:
54.9 other: cm3/g
pH:
5.3
Temp.:
20 °C
Matrix:
loamy sand
% Org. carbon:
1.42
Remarks on result:
other: log Koc = 1.74
Remarks:
Tier 2 test: Adsorption
Sample No.:
#2
Type:
Koc
Value:
47.2 other: cm3/g
pH:
5.4
Temp.:
20 °C
Matrix:
sandy loam
% Org. carbon:
0.72
Remarks on result:
other: log Koc = 1.67
Remarks:
Tier 2 test: Adsorption
Sample No.:
#3
Type:
Koc
Value:
33.1 other: cm3/g
pH:
7.5
Temp.:
20 °C
Matrix:
loam
% Org. carbon:
1.81
Remarks on result:
other: log Koc = 1.52
Remarks:
Tier 2 test: Adsorption

Results: Batch equilibrium or other method

Mass balance (%) at end of adsorption phaseopen allclose all
Sample no.:
#1
Duration:
48 h
% Adsorption:
62.8
Remarks on result:
other: Tier 2, loamy sand
Remarks:
mean value (parental mass balance)
Sample no.:
#2
Duration:
48 h
% Adsorption:
79.8
Remarks on result:
other: Tier 2, sandy loam
Remarks:
mean value (parental mass balance)
Sample no.:
#3
Duration:
48 h
% Adsorption:
71.9
Remarks on result:
other: Tier 2, loam
Remarks:
mean value (parental mass balance)
Sample no.:
#1
Duration:
2 h
% Adsorption:
91
Remarks on result:
other: Tier 2, loamy sand
Remarks:
mean value (parental mass balance)
Sample no.:
#2
Duration:
2 h
% Adsorption:
98
Remarks on result:
other: Tier 2, sandy loam
Remarks:
mean value (parental mass balance)
Sample no.:
#3
Duration:
2 h
% Adsorption:
97.9
Remarks on result:
other: Tier 2, loam
Remarks:
mean value (parental mass balance)
Mass balance (%) at end of desorption phaseopen allclose all
Sample no.:
#1
Duration:
2 h
% Desorption:
<= 0.1
Remarks on result:
other: Adsorption time of 2 hours was chosen for Tier 3, due to the instability of test item for adsorption > 2 hours.
Remarks:
The adsorption is considered to be irreversible and no desorption isotherms were calculated.
Sample no.:
#2
Duration:
2 h
% Desorption:
<= 0.1
Remarks on result:
other: Adsorption time of 2 hours was chosen for Tier 3, due to the instability of test item for adsorption > 2 hours.
Remarks:
The adsorption is considered to be irreversible and no desorption isotherms were calculated.
Sample no.:
#3
Duration:
2 h
% Desorption:
<= 0.1
Remarks on result:
other: Adsorption time of 2 hours was chosen for Tier 3, due to the instability of test item for adsorption > 2 hours.
Remarks:
The adsorption is considered to be irreversible and no desorption isotherms were calculated.

Applicant's summary and conclusion

Conclusions:
According to Briggs (1973), the mobility of [phenyl-U-14C]2,4-difluoroaniline in soil can be classified as intermediate to low based on these tier 3 results.