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Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
adsorption / desorption: screening
Type of information:
calculation (if not (Q)SAR)
Remarks:
Kd value determined based on a probability density function derived using a dataset of 74 data points from 3 studies
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline required
Principles of method if other than guideline:
A probability density function was derived for ruthenium based on data collated from several publications. For ruthenium, 74 data points were included taken from 3 studies covering 5 environmental systems. The aim of the study was to derive conditional probability density functions, based on different environmental conditions. However, due to the scarcity of data for ruthenium, only a non-conditional probability density function was built.
GLP compliance:
no
Type of method:
other: Partition coefficient derived based on 74 data points from 3 studies
Media:
suspended matter
Details on test conditions:
Three studies were included in the derivation of the probability density function:
- Ciceri et al. 1988:
Media: Suspended particulate matter
Environment: Po river, Italy
Experiment: In situ and laboratory
Co-factors: m/v ratio
- Martin and Thomas 1990:
Media: Suspended particulate matter
Environment: Rhone river, France
Experiment: In situ
- Schell et al. 1980:
Media: Sediment
Environment: Michigan lake, Hudson and Clinch river, USA
Experiment: Laboratory
Co-factors: pH, m/v ratio
Type:
log Kd
Value:
4.5 dimensionless
Matrix:
Suspended particulate matter and sediment
Remarks on result:
other: Modal Kd based on 74 data points from 3 studies
Type:
log Kd
Value:
4 dimensionless
Matrix:
Suspended particulate matter and sediment
Remarks on result:
other: 5th percentile based on 74 data points from 3 studies
Type:
log Kd
Value:
5 dimensionless
Matrix:
Suspended particulate matter and sediment
Remarks on result:
other: 95th percentile based on 74 data points from 3 studies
Validity criteria fulfilled:
not applicable
Conclusions:
For ruthenium, the log Kd for suspended matter is 4.5 (Kd 31600 L kg-1).
Executive summary:

A review of information on the partitioning of radioisotopes of several metals (Ciffroy et al. 2009), including ruthenium, summarised information from several other studies of ruthenium partitioning to suspended particulate matter or sediment. This study derived a probability density function for the partition coefficient of ruthenium ranging from a 5th percentile of 10000 l kg-1to a 95th percentile of 100000 l kg-1, with a mode of 31600 l kg-1(modal logKd4.5, 5th %ile 4.0, 95th %ile 5.0). The studies included in this review were subject to a detailed review, with the intention of deriving conditional partition coefficients for different types of water conditions, although there were insufficient data to enable this approach to be taken for ruthenium. The partition coefficient derived for ruthenium was based on a total of 74 data points, from three studies, covering five different environmental systems.

The Kd for soil was determined to be 6320 L kg-1 (log Kd 3.8) based on the modal log Kd from Ciffroy et al. (2009), converted based on astandard soil with 2 % organic carbon.

Description of key information

For ruthenium, the log Kd for suspended matter is 4.5 (Kd 31600 L kg-1). The log Kd for soil is 3.8 (Kd 6320 L kg-1).

Key value for chemical safety assessment

Other adsorption coefficients

Type:
log Kp (solids-water in suspended matter)
Value in L/kg:
4.5
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in soil)
Value in L/kg:
3.8
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in sediment)
Value in L/kg:
4.5
at the temperature of:
20 °C

Additional information

A review of information on the partitioning of radioisotopes of several metals (Ciffroy et al. 2009), including ruthenium, summarised information from several other studies of ruthenium partitioning to suspended particulate matter or sediment. This study derived a probability density function for the partition coefficient of ruthenium ranging from a 5th percentile of 10000 L kg-1 to a 95th percentile of 100000 L kg-1, with a mode of 31600 L kg-1 (modal logKd 4.5, 5th %ile 4.0, 95th %ile 5.0). The studies included in this review were subject to a detailed review, with the intention of deriving conditional partition coefficients for different types of water conditions, although there were insufficient data to enable this approach to be taken for ruthenium. The partition coefficient derived for ruthenium was based on a total of 74 data points, from three studies, covering five different environmental systems.

The Kd for soil was determined to be 6320 L kg-1 (log Kd 3.8) based on the modal log Kd from Ciffroy et al. (2009), converted based on a standard soil with 2 % organic carbon.