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Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption
Remarks:
adsorption
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Acceptable, well documented publication which meets basic scientific principles

Data source

Reference
Reference Type:
publication
Title:
Unnamed
Year:
2001

Materials and methods

Principles of method if other than guideline:
The method for estimation of the partition coefficient was not specified.
GLP compliance:
not specified
Type of method:
other: no data
Media:
sediment

Test material

Constituent 1
Details on test material:
- Name of test material (as cited in study report): Lanthanide, analysed as Lanthanum, Praseodymium, Samarium, Gadolinum, Dysprosium, Erbium, Ytterbium, Cerium, Neodymium, Europium, Terbium, Holmium, Thulium, Lutetium (only data for Lanthanum shown)
Radiolabelling:
not specified

Study design

Test temperature:
15 °C

Batch equilibrium or other method

Analytical monitoring:
yes
Details on sampling:
- Surface-water samples and sediments (through 25-cm-deep, box-core sampling) were collected during June and July 1997 at a location in the Rhine-Meuse estuary at turn of tide (Nieuwe Maas, km 1006). The location was relatively clean (in comparison with other locations used in this investigation with further objectives).
Details on matrix:
- Surface-water samples and sediments (through 25-cm-deep, box-core sampling) were collected during June and July 1997 at a location in the Rhine-Meuse estuary at turn of tide (Nieuwe Maas, km 1006). The location was relatively clean (in comparison with other locations used in this investigation with further objectives).
- Surface- and pore-water samples were obtained by positive-pressure filtration (0.45-mm filters, 142 mm diam.) of the water and sediment samples under aerobic and anaerobic conditions, respectively.
- organic carbon (%): 2.13 (range 0.88-2.81), derived from six different locations in the Rhine-Meuse estuary, one of these is the location used in the present examination.
Details on test conditions:
For every assay, two acid-rinsed polystyrene aquaria (replicates) were filled with sediments (1750 g wet weight) and seawater (4 L) from the appropriate location. Standard conditions: pH = 8.1, salinity 30 ‰, no addition of complexing agents, exposure time 10 d.
Further assays were conducted with diversified conditions:
- varying pH: 7.1, 7.7, 8.1 and 8.5;
- varying salinity: 10, 20 and 30‰
- addition of complexing agents: 500 mg H(PO4)2-, 400 µg F-

Results and discussion

Adsorption coefficientopen allclose all
Type:
Koc
Value:
ca. 469 484 - ca. 8 348 730
Type:
log Koc
Value:
ca. 5.67 - ca. 6.92

Any other information on results incl. tables

For a sediment/pore water Kd, Csolid refers to sediment and Cdiss to pore water:

standard conditions (pH = 8.1, salinity 30‰): log Kd = approx. 4.75

varying pH: Lowering as well as increasing pH caused the Kd to decrease, indicating increased complexation in the water phase (exception: pH = 7.1)

pH = 7.1: log Kd = approx. 4.8

pH = 7.7: log Kd = approx. 4.7

pH = 8.5: log Kd = approx. 4.0

varying salinity: decreasing salinity caused the Kd to increase:

salinity 20‰: log Kd = approx. 5.1

salinity 10‰: log Kd = approx. 5.25

addition of complexing agents: addition of phosphate or fluoride caused the Kd to increase:

addition of phosphate: log Kd = approx. 5.25

addition of fluoride: log Kd = approx. 4.9

All treatments were tested against the standard condition (pH 8.1, Sal = 30‰, no addition) and appeared to be significantly different at p < 0.0005 (paired t-test).

The organic carbon fraction in the sediment was 2.13% (range 0.88 -2.81).

Hence the Koc can be calculated according to the equation:

Koc = (100%/oc%)*Kd

Taken into account all results of Kd presented above, the resulting log Koc was in a range of 5.67 - 6.92.

Applicant's summary and conclusion