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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption coefficient of Direct Brown 44 on soil:
log  Koc < 1.5 (-1.06 ± 1.53) (pH = 6.09, 25°C)
Adsorption coefficient of Direct Brown 44 on sewage sludge:
log  Koc < 1.5 (-0.06 ± 1.14) (pH = 6.09, 25°C)

Key value for chemical safety assessment

Koc at 20 °C:
31.622

Additional information

Test substance Direct Brown 44 has been tested for estimation of Koc using HPLC according to EU method C.19 and OECD 121.

Adsorption coefficient of Direct Brown 44 on soil:

log  Koc < 1.5 (-1.06 ± 1.53) (pH = 6.09, 25°C)

 Adsorption coefficient of Direct Brown 44 on sewage sludge:

log  Koc < 1.5 (-0.06 ± 1.14) (pH = 6.09, 25°C)

The study results does not comply with all acceptability criteria, the values of log Koc are out of application range recommended in the guidelines (1.5 – 5.0).

[LogKoc: 1.5]