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Environmental fate & pathways

Adsorption / desorption

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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