Registration Dossier

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption, other
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference
Reference Type:
publication
Title:
Sediment chronologies of As, Bi, and Ga in Sweden - impact of industrialisation.
Author:
Karlsson S., Duker A., Grahn E.
Year:
2007
Bibliographic source:
Journal of Environmental Science and Health Part a-Toxic/Hazardous Substances & Environmental Engineering 42:155-164.

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Monitoring of ambient Bi concentration in sediment and corresponding pore water from remote lakes in Sweden.
GLP compliance:
not specified
Type of method:
other: Monitoring study
Media:
sediment

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
liquid - solid: mixture of
Details on test material:
Sediment and water
Radiolabelling:
no

Study design

Test temperature:
Not reported

Batch equilibrium or other method

Analytical monitoring:
yes
Details on sampling:
Sediment cores were collected from lakes in Sweden. Water samples were taken at 0.5 m in the thermoclines and 1.5 m above the sediment. The sediment cores were sliced into 1 to 3cm sections and the pore water was separated by centrifugation. The solid phase was dried, homogenised and leached with concentrated nitric acid.
Computational methods:
Kp (L/kg dry weight) = Bi concentration in sediment (mg Bi/kg dry weight) / Bi concentration in water (mg Bi/L)

Results and discussion

Partition coefficients
Phase system:
solids-water in sediment
Type:
log Kp
Value:
> 4.3 - < 4.5

Results: Batch equilibrium or other method

Adsorption and desorption constants:
Kp (solids-water in sediment) range is 19950-31620 L/kg dry weight
Concentration of test substance at end of adsorption equilibration period:
Concentration solid phase = 0.06-1.2 mg Bi/kg dry weight
Concentration liquid phase = 0.85±0.41 µg Bi/L
Statistics:
No information available

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
No guideline followed, but study well performed and well documented. Based on adsorption experiment, the log Kp (solids-liquid in sediment) ranges from 4.3 to 4.5.