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Environmental fate & pathways

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Adsorption/ desorption

The adsorption/ desorption coefficient Koc of the test item was assessed using an HPLC method according to OECD 121, adopted in 2001. 15 µL of the test item solution (4.3 mg/L mobile phase) were injected onto the column. The retention time of the test item was determined in duplicate and the capacity factor k was calculated. The assay was performed with pH 7.2 at 35 °C. 6 reference compounds were included according to the guideline. The calculated log Koc was estimated to be 6.5 at pH 7.2 (PCKOCWIN). This corresponds to a Koc = 3.23 x 10E06. The experimentally derived logKoc which was deduced from the capacity factor k' using a calibration plot of log k' versus log Koc of the reference compounds, was 6.49 with pH 7.2 at 35 °C. This corresponds to a Koc = 3.1 x 10E06.