Registration Dossier
Registration Dossier
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EC number: 231-561-1 | CAS number: 7632-51-1
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Partitioning of vanadium element was tested in several ways, in an important number of studies with tested waters and soils all around the world.
The availability of metal compounds for uptake by biota can differ from site to site and may change over time due to many processes, including weathering and (de)sorption processes. It should also be noted that Kd’s are accurate only during an equilibrium state, which generally doesn’t exist for metals in the environment. As a consequence, part of the metal present in the solid phase may be encapsulated in the mineral fraction and is therefore not available.
Since the partitioning coefficient is such an important parameter that can drive the outcome of the exposure assessment, the assessment of the data quality and relevance of all collected measured Kd-values was done with care. Preference was given to coupled measured data for which information is available on both sampling and analytical measuring techniques, as recommended by Metal Environmental Risk Assessment Guidance (MERAG).
The most recent and relevant are reported here in a weight of evidence approach. Log Kp found for partitioning between water and soil, sediment or suspended matter are reported in key values below.
All these coefficients confirmed a high adsorptivity of the substance on particulate matter and immobility in soils, leading to a poor availability to biota in water.
A Koc cannot be calculated as vanadium is inorganic, therefore the Kp value for suspended matter- water was set as key value for assessment.
Key value for chemical safety assessment
Other adsorption coefficients
- Type:
- log Kp (solids-water in soil)
- Value in L/kg:
- 2.3
- at the temperature of:
- 22 °C
Other adsorption coefficients
- Type:
- log Kp (solids-water in suspended matter)
- Value in L/kg:
- 3.45
- at the temperature of:
- 23.5 °C
Other adsorption coefficients
- Type:
- log Kp (solids-water in sediment)
- Value in L/kg:
- 3.97
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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