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EC number: 215-149-9
CAS number: 1306-25-8
Kp for solid particulate matter and water (Kpsusp): 130000 l/kg (log value: 5.1)Kp for water and sediment (Kpsed); 10000 l/kg (log value: 4 ) Kd for marine waters is 617 l/kg (log value: 2.79)
For metals, the transport and distribution over the different
environmental compartments e.g. the water (dissolved fraction, fraction
bound to suspended matter), soil (fraction bound or complexed to the
soil particles, fraction in the soil pore water,...) is described and
quantified by the metal partition coefficients between these different
fractions. The information on these partition coefficients is given
Partition coefficients for cadmium in freshwater have been reviewed in
the EU risk assessment report (ECB 2008). Based on this experimental
evidence, a partition coefficient for the distribution between solid
particulate matter and water (Kpsusp) of 130 x 103l/kg has
been defined for EU waters and was used throughout the RAR..
The Kp for the distribution
between sediment and water (Kpsed) was estimated in the RAR
from the ratio of the average sediment (1.32mg/kgDW) to average water Cd
concentrations (0.14µg/l). This "best fit" Kd yields 10000L/kgDW (ECB
These partition coefficients have been used since then in other
legislative processes in the EU (e.g. the water framework directive) and
will also be used for REACH.
The marine Kd was derived based
on data from several marine waters. the geomean value for cadmium in
seawater is 617 l/kg
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