Registration Dossier

Environmental fate & pathways

Adsorption / desorption

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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.

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:
4.6
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