Registration Dossier
Registration Dossier
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EC number: 201-245-8 | CAS number: 80-05-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- 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
- Radiolabelling:
- yes
- Analytical monitoring:
- yes
- Type:
- Koc
- Value:
- 636 - 931
- Type:
- log Koc
- Value:
- 2.8 - 2.97
- Executive summary:
Across four soil types (organic carbon ranged from 0.92 to 2.11%), equilibrium Koc values ranged from 636 to 931 L/kg, averaging 796 L/kg.
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
- GLP compliance:
- not specified
- Type of method:
- batch equilibrium method
- Media:
- soil
- Radiolabelling:
- yes
- Analytical monitoring:
- yes
- Type:
- Koc
- Value:
- 890
- Type:
- log Koc
- Value:
- 2.95
- Adsorption and desorption constants:
- Adsorption Koc = 890 L/kg
Desorption Koc = 1090 L/kg - Executive summary:
Koc was determined to 890 L/kg.
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
- GLP compliance:
- not specified
- Type of method:
- batch equilibrium method
- Media:
- other: aquifer material
- Analytical monitoring:
- yes
- Type:
- Koc
- Value:
- 778
- Type:
- log Koc
- Value:
- 2.89
- Executive summary:
Koc was determined to 778 L/kg.
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
- GLP compliance:
- not specified
- Type of method:
- batch equilibrium method
- Media:
- soil
- Radiolabelling:
- no
- Analytical monitoring:
- yes
- Type:
- Koc
- Value:
- 251 - 1 507
- Type:
- log Koc
- Value:
- 2.4 - 3.18
- Executive summary:
Across four soil types, equilibrium Koc values ranged from 251 to 1507 L/kg.
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Lack of full experimental details.
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
- GLP compliance:
- not specified
- Type of method:
- batch equilibrium method
- Media:
- soil
- Analytical monitoring:
- yes
- Type:
- Koc
- Value:
- 335 - 703
- Type:
- log Koc
- Value:
- 2.525 - 2.847
- Executive summary:
Across four soil types, equilibrium Koc values ranged from 335 to 703 L/kg.
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Lack of full experimental details and results.
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
- GLP compliance:
- not specified
- Type of method:
- batch equilibrium method
- Media:
- sediment
- Analytical monitoring:
- yes
- Type:
- Koc
- Value:
- 305
- Type:
- log Koc
- Value:
- 2.484
- Executive summary:
Koc was determined to 305 L/kg.
Referenceopen allclose all
Results of preliminary test #1:
Adsorption rates were a function of the soil concentration tested, ranging from 54.7 to 88.5% of applied radioactivity (AR). The lowest soil concentration was used for the second preliminary test.
Results of preliminary test #2:
BPA concentrations declined over the 72h test duration. Thus, the effect of the use of the biocide HgCl2 on BPA stability was investigated.
Results of preliminary test #3:
HgCl2 stabilized BPA concentrations over 72h in three of the four soil types. Thus, HgCl2 was used in the definitive test.
Results of the definitive test:
Freundlich coefficients for the adsorption of 14C-BPA on four soil types -
Soil 1/n Kd Koc R2
I 0.7719 12.57 930.9 0.9999
II 0.8525 6.934 636.1 0.9997
III 0.7019 17.12 811.2 0.9999
IV 0.8414 7.409 805.3 0.9999
Average values 11.01 795.9
Koc values (Kd values/OC) ranged from 636.1 to 930.9 L/kg and averaged 795.9 L/kg. A regression of soil organic carbon and Kd values yielded an R-squared value of 0.915.
Batch sorption tests:
Adsorption Koc = 890 L/kg
Desorption Koc = 1090 L/kg
Dialysis tests:
Kdoc (16 h) = 900+- 80 L/kg (absolute deviation from mean)
Kdoc (23 h) = 850+-30 L/kg
Kdoc (41 h) = 860+-70 L/kg
The amount and kind of dissolved organic matter added to test solutions did not significantly change the Koc values. Results suggest similar binding mechanisms for soil and dissolved organic matter.
Data were plotted but individual data points were not given.
The sorption coefficient Kd (at the intercept) was 3.89 (L/kg) and the Freundlich coefficient was 0.85 (r2 = 0.93). With an organic C content of 0.5% (foc = 0.005), Koc was 778 L/kg.
A retardation factor (Rf) for transport of BPA in groundwater was calculated: Rf = 1 + B/P Kd, where B = bulk density (1.4 g/cm3), P = porosity of aquifer material (0.45 cm3/cm3), Kd was the lowest individual Kd value measured (2.25 L/kg).
An Rf of 8 (dimensionless) was calculated. This result means that BPA would be transported at one eighth (1/8) the velocity of the groundwater velocity.
SOIL PARTITION COEFFICIENTS (KD and KOC, L/KG):
Roseworthy Campus (RC):
Kd = 11; Koc = 881
Roseworthy Farm (RF):
Kd = 2; Koc = 251
Terretfield (TF):
Kd = 22; Koc = 1210
Waite Campus (WT):
Kd = 44; Koc = 1507
Sorption was almost completely reversible for three of the four soils, the exception being the surface soil with the highest organic carbon content, 9.3 g/kg.
The data were best fit with the Freundlich model. Sorption was reversible with most sediments. The pH of the solutions had a small effect on sorption. The average Koc value was 305 L/kg.
Description of key information
The soil sorption organic carbon normalised partition coefficient values (Koc) of Bisphenol A range from 251 to 1507 L/kg, averaging 750 +/- 348 L/kg.
Key value for chemical safety assessment
- Koc at 20 °C:
- 750
Additional information
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