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Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption: screening
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 calculation method

Data source

Reference
Reference Type:
publication
Title:
Predicting the sorption of fatty alcohols and alcohol ethoxylates to effluent and receiving water solids.
Author:
van Compernolle R1, McAvoy DC, Sherren A, Wind T, Cano ML, Belanger SE, Dorn PB, Kerr KM
Year:
2006
Bibliographic source:
Ecotoxicology and Environmental Safety 65: 61-74

Materials and methods

Principles of method if other than guideline:
Mixture of spiked activated sludge sediment and river water was stirred and the subsequent adsorption of radioactive substance to the suspended matter counted by LSC.
GLP compliance:
no
Type of method:
other: Radiolabelled C14 count via LSC
Media:
soil/sewage sludge

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): C14-Dodecanol, 295 mCi/g
- Substance type: Alcohol
- Physical state: liquid
- Analytical purity: GC of unlabeled alcohol C12 to LSC concentration in spiked alcohol resulted in a ratio of 0.95
- Lot/batch No.: 030626
- Expiration date of the lot/batch:
- Radiochemical purity (if radiolabelling): >99 %
- Specific activity (if radiolabelling): 250 µCi per alcohol
Radiolabelling:
yes

Study design

Test temperature:
Not specified

Batch equilibrium or other method

Analytical monitoring:
not required
Computational methods:
Mathematical fitting of sorption data:
log K = xC + b (where K is the sorption coefficient in L/kg, C is the carbon number of the alkyl side chain; x and b are fitted by the regression routine that minimises the least-squares residual (R2).

Results and discussion

Adsorption coefficientopen allclose all
Type:
log Koc
Value:
4.25
Remarks on result:
other: dodecanol, derived from kd value using foc=0.167
Type:
log Koc
Value:
4.71
Remarks on result:
other: tetradecanol, derived from kd value using foc=0.167
Type:
Kd
Value:
3 000
Remarks on result:
other: dodecanol, measured ±78 after 72 h
Type:
Kd
Value:
6 400
Remarks on result:
other: tridecanol (estimated)
Type:
Kd
Value:
8 490
Remarks on result:
other: tetradecanol, measured ±916 after 72 h
Type:
Kd
Value:
30 000
Remarks on result:
other: pentadecanol (estimated)

Any other information on results incl. tables

The results demonstrate that sorption can be effectively modeled using a log Kd vs. Cx and EOy predictive equation having the form log Kd = 0.331C - 0.00897EO - 1.126 (R2 = 0.64).

Applicant's summary and conclusion