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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The log of the adsorption coefficient (KOC) of test item was estimated to be log KOC<1.25 which is equal to a KOCvalue of < 18 using the HPLC method. 

Key value for chemical safety assessment

Koc at 20 °C:
18

Additional information

The determination of the adsorption coefficient (KOC) of test item was performed according to the OECD Guideline for the Testing of Chemicals, No. 121, Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge using High Performance Liquid Chromatography (HPLC), January, 2001 and the EC Directive 2001/59, C.19. The test item solution was injected three times and the reference solution was injected six times. The test item was not retained under the chromatographic conditions of the test and was eluted at the dead time. The KOC of test item was therefore determined to be lower than that one of the lowest reference item used (acetanilide). The chromatography of the test item resulted in one main peak with a well-defined and reproducible retention time. The HPLC method was therefore considered to be suitable for the purpose of the study. Based on the chromatographic data, the test item was considered to be stable during the test procedure. In conclusion, the log of the adsorption coefficient (KOC) of test item was estimated to be log KOC <1.25 which is equal to a KOC value of < 18 using the HPLC method. This value indicates that the test item will not be adsorbed by organic carbon in soil.

[LogKoc: 1.25]