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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 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 astandard soil with 2 % organic carbon.

Biodegradation and hydrolysis are not relevant for this substance as it is inorganic.