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Environmental fate & pathways

Adsorption / desorption

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Description of key information

According to OECD/EC test guidelines, the adsorption coefficient using the high performance liquid chromatography (HPLC) method has been determined to be a Koc of 30903 (log Koc = 4.49), which is taken for the assessments, as this value is the worst-case value for the compartment water.

Key value for chemical safety assessment

Koc at 20 °C:
30 903

Additional information

In an OECD/EC study, using the high performance liquid chromatography (HPLC) method, the adsorption coefficient was determined. In the chromatogram of the test substance solution, two partly overlapping large peaks were observed which were considered to derive from the major components in the test substance. Furthermore three small test substance peaks were observed. These peaks were considered to derive from minor components in the test substance. The Koc and log Koc values of the major components in 2-amylanthraquinone and of one minor component with a peak area > 1% are:

Minor component – peak 1: Koc = 1.5 x 10^3; log Koc = 3.18

Major component – peak 4: Koc = 3.1 x 10^4; log Koc = 4.49

Major component – peak 5: Koc = 3.7 x 10^4; log Koc = 4.57