Registration Dossier
Registration Dossier
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EC number: 604-667-4 | CAS number: 14898-67-0
Adsorption / desorption
Administrative data
Link to relevant study record(s)
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.
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