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Environmental fate & pathways

Adsorption / desorption

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Link to relevant study record(s)

Reference
Endpoint:
adsorption / desorption, other
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
The aim of this study was to examine the partitioning of BPA compared to BPAF and BPS in soil−water and octanol−water systems at different pH values. Sorption of BPA, BPA,F and BPS was measured by independently quantifying aqueous and sorbed-solid phase concentrations on four soils varying in physical and chemical properties. pH-dependent octanol−water distribution coefficients (DowpH) were measured for three chemicals at several pH points with subsequent octanol−water distribution curves calculated over a wider pH range and correlated to predicted pH-dependent organic carbon (OC) normalized partition coefficients (DocpH).
GLP compliance:
not specified
Type of method:
batch equilibrium method
Media:
soil
Specific details on test material used for the study:
Origin of 4,4'-Sulfonyldiphenol: Sigma Chemicals, St. Louis, MO
Radiolabelling:
no
Test temperature:
23 °C +/- 2
Analytical monitoring:
yes
Matrix no.:
#1
Matrix type:
other: FRST-48
% Clay:
9
% Silt:
52
% Sand:
39
% Org. carbon:
2.38
pH:
5.5
CEC:
7.4 other: cmol/kg
Matrix no.:
#2
Matrix type:
other: PSF-49
% Clay:
17
% Silt:
40
% Sand:
43
% Org. carbon:
2.62
pH:
7.8
CEC:
19 other: cmol/kg
Matrix no.:
#3
Matrix type:
other: EPA-09
% Clay:
17.4
% Silt:
75.6
% Sand:
7.1
% Org. carbon:
0.11
pH:
8.6
CEC:
12.4 other: cmol/kg
Matrix no.:
#4
Matrix type:
other: EPA-14
% Clay:
63.6
% Silt:
34.4
% Sand:
2.1
% Org. carbon:
0.48
pH:
3.8
CEC:
18.9 other: cmol/kg
Key result
Sample No.:
#1
Type:
log Koc
Value:
2.81
pH:
5.5
Temp.:
23 °C
Matrix:
FRST-48
% Org. carbon:
2.38
Key result
Sample No.:
#2
Type:
log Koc
Value:
2.42
pH:
7.8
Temp.:
23 °C
Matrix:
PSF-49
% Org. carbon:
2.62
Key result
Sample No.:
#3
Type:
log Koc
Value:
2.91
pH:
8.6
Temp.:
23 °C
Matrix:
EPA-09
% Org. carbon:
0.11
Key result
Sample No.:
#4
Type:
log Koc
Value:
3.21
pH:
3.8
Temp.:
23 °C
Matrix:
EPA-14
% Org. carbon:
0.48

Description of key information

Geometric mean of LogKoc values (at 23 °C) derived from experiments conducted with 4 differents soils: 2.82

Key value for chemical safety assessment

Koc at 20 °C:
660.7

Additional information

[LogKoc: 2.82]