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The test method for the determination of the adsorption coefficient (Koc) of a substance as described for liquid materials in test guideline C.19 of EC Regulation 440/2008 was replaced by a theory based evaluation. Due to the fast and spontaneous hydrolysis of Incorez 397 upon contact with water, experimental determination of the Koc was technically not feasible. The log Koc was calculated using KOCWIN v2.00 as part of EPISuite v4.11 from US Environmental Protection Agency. Using KOCWIN v2.00 the log Koc of the test item was calculated to be 4.45 at 25 °C (EPI Suite, 2014).