Registration Dossier
Registration Dossier
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EC number: 910-356-7 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Transportation and distribution
Adsoption / desorption:
- Kp (soil) = 2363 L/kg / log Kp: 3.4, pH: 7, OC: 2% (Sauvé et al. 2000, RL 2)
- Median Kp (suspended matter) = 30246 L/kg / log Kp (pm/w) = 4.48 (OECD SIDS report, 2014; EU Assessment report, France, 2011)
- Median Kp (sediment) = 24409 L/kg / log Kp (sed/w) = 4.39 (OECD SIDS report, 2014; EU Assessment report, France, 2011)
- For STP partitioning coefficients the median Kp for suspended matter was adopted.
Additional information
Two reliable key studies are available for the determination of the adsorption / desorption partitioning coefficient for the reaction mass of copper oxide and manganese dioxide on the basis of the dissolved elements copper and manganese.
Sauvé et al. 2000 derived an empirical linear regression and semi-mechanistic model for copper in order to calculate a partitioning coefficient depending on soil solution pH and soil organic carbon (RL2, 2000). The derived Kd soil for copper was 2363 L/kg (log Kd: 3.4) assuming a soil solution of pH 7 and OC of 2% (parameters set acc. to REACH Guidance Chapter R.16: Environmental exposure assessment (2016)).
The reliable key study for manganese was performed similar to OECD 106, Equilibrium Partitioning Method (RL 2, 2010). The partitioning characteristics of manganese were investigated in 35 European soils. Soils covered a pH range of 3.0–8.5. The organic carbon content was 0-23.3%. The measured median Kd soil for manganese was1598 L/kg / log Kd: 3.2.
The Kd soil for copper and manganese were very similar, i.e. log Kd of 3.4 and 3.2, respectively. As hazard and risk assessment were based on soluble copper, which was the more hazardous element compared to manganese for the aquatic environment, the log Kd soil for copper was used as key value for further assessment of the submission substance.
Furthermore, typical Kp / Kd values for copper to freshwater, suspended matter and freshwater sediment were provided in the OECD SIDS report (2014) and the EU Assessment report for copper(II)oxide (France, 2011). The following Kp values were used for the environmental risk assessment: Kp (suspended matter) = 30246 L/kg / log Kp (pm/w) = 4.48 (50th percentile); Kp (sediment) = 24409 L/kg / log Kp (sed/w) = 4.39 (50th percentile). For STP partitioning coefficients the median Kp for suspended matter was adopted.
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