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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Low adsorption potential.

Key value for chemical safety assessment

Koc at 20 °C:
0.675

Other adsorption coefficients

Type:
log Kp (solids-water in suspended matter)
Value in L/kg:
-0.038

Other adsorption coefficients

Type:
log Kp (solids-water in soil)
Value in L/kg:
-0.66

Additional information

According to the REACH Regulation, Annex VIII, Column 2, the study does not need to be conducted if based on the physicochemical properties the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient). Direct Blue 199 is expected to have a low potential for absorption, on the basis of the partition coefficient; the log Pow was determined to be negative.

The organic carbon-water, suspended matter-water and soil-water partition coefficients were in any case estimated, using EUSES v.2.1.2, in order to derive the PNECs for sediment and soil, according to the equilibrium partitioning method.

Furthermore, for the same purpose the soil-water and suspended matter-water partition coefficients were also estimated:

Suspended matter-water partition coefficient: 0.917

Soil-water partition coefficient: 0.22

[LogKoc: -0.17]