Registration Dossier
Registration Dossier
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EC number: 942-401-1 | CAS number: -
Adsorption / desorption
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:
- 2 007
- 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 substance name:
- Bismuth
- EC Number:
- 231-177-4
- EC Name:
- Bismuth
- Cas Number:
- 7440-69-9
- Molecular formula:
- Bi
- Test material form:
- liquid - solid: mixture of
- Details on test material:
- Sediment and water
Constituent 1
- 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.
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