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Environmental fate & pathways

Adsorption / desorption

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Description of key information

With a log Koc of < 1.25 L/kg (equivalent to a Koc value of <18) the substance may be considered mobile. 

Key value for chemical safety assessment

Koc at 20 °C:
18

Additional information

The adsorption/desorption characteristics of the test substance were investigated in a GLP-compliant study performed in accordance with OECD Guideline 121 (HPLC Method) (RCC, 2005). In this study, all solutions were analysed with HPLC with UV-VIS detector, reversed phase column (LiChrospher 100 CN column) and an aqueous mobile phase (methanol/water solution (55/45 v/v)). The log k’ values of reference substances were plotted against their known log Koc values. The log Koc value for the test substance was calculated by substituting its mean log k’ in the calibration curve. Under the conditions of the test, the log Koc of the test substance was determined at ≤1.25 (equivalent Koc ≤ 18 L/kg) which indicates that the test substance is very mobile. Using QSAR calculations correlating the Koc with water solubility or n-octanol/water partition coefficient, the average adsorption coefficient of the test item was estimated to be Koc = 11 (all Regressions), confirming the very high mobility of the test item.

[LogKoc: 1.25]