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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Description of key information

Potassium is an essential macronutrient in aquatic and terrestrial ecosystems. Dissolved potassium occurs in solution as dissociated K+ ions. Although K is an abundant element, its mobility in soils, sediments and suspended matter is limited since it is readily incorporated into clay lattices and it is adsorbed more strongly than Na+ to the surfaces of clay minerals and organic matter (Salminen, 2005).A European median log Kp value of 3.99 L/kg is derived for sediment-water partitioning.

Key value for chemical safety assessment

Other adsorption coefficients

Type:
log Kp (solids-water in sediment)
Value in L/kg:
3.99

Other adsorption coefficients

Type:
other: desorption coefficient Kd (water-soil) miscible displacement technique, min. Kd
Value in L/kg:
1.2

Other adsorption coefficients

Type:
other: desorption coefficient Kd (water-soil) miscible displacement technique, max. Kd
Value in L/kg:
10.9

Additional information