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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Partition coefficients

For metals, the transport and distribution over the different environmental compartments e.g. the water (dissolved fraction, fraction bound to suspended matter), soil (fraction bound or complexed to the soil particles, fraction in the soil pore water,...) is described and quantified by the partition coefficients (Kd values) between these different fractions.

For Germanium, Kd's between sediment and freshwater were determined for regional freshwater and estuarine waters. The Kd values are:

-for freshwater: >9796 L/kg (based on 90P values) and > 13810 L/kg (based on 50P values) for Ge in sediment and freshwater.

-for estuarine waters: 452 L/kg based on 90P values also.

the Log Kd for freshwater - sediment is also considered relevant for the sludges and the suspended matter.

For soil, a realistic Kd value of 1000kg/l was derived from the literature (Sheppard et al 2009).

Key value for chemical safety assessment

Other adsorption coefficients

Type:
log Kp (solids-water in effluent sewage sludge)
Value in L/kg:
4.14
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in activated sewage sludge)
Value in L/kg:
4.14
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in settled sewage sludge)
Value in L/kg:
4.14
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in raw sewage sludge)
Value in L/kg:
4.14
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in suspended matter)
Value in L/kg:
4.14
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in sediment)
Value in L/kg:
4.14
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in soil)
Value in L/kg:
3
at the temperature of:
20 °C

Additional information