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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The adsorption coefficient log KOC was determined to be 3.8 for soil and 4.0 for sewage sludge for the structural analogue substance.

Key value for chemical safety assessment

Koc at 20 °C:
10 000

Additional information

The adsorption coefficient (KOC) on soil and on sewage sludge using high performance liquid chromatography (HPLC) was estimated according to OECD/OCDE 121 (2001) and Council Regulation (EC) No. 440/2008, Method C.19 for the structural analogue.

The test was performed temperature controlled, (22.7 °C, mean value) with a mobile phase consisting of 50 % acetonitrile and 50 % HPLC water. A 50 mg/L sample of the test item was analysed threefold via HPLC on a cyanopropyl (CN-) column with DAD‑detection.

Calibrations were performed using eight reference items for soil and seven for sewage sludge with known log KOCvalues (given by the guidelines). The reference items were measured twice, once before and once after the measurement (double injection of one replicate) of the test item. Void time of the HPLC-system was determined with sodium nitrate.


Two individual log KOCvalues for soil and for sewage sludge for the test item were derived under consideration of the first and second calibration. Finally, a mean value for soil and for sewage sludge was calculated from these individual log KOCvalues. Based on these data a log KOCof 3.8 for soil and a log KOCof 4.0 for sewage sludge were determined for the substance.

[LogKoc: 4.0]