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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The adsorption coefficient (Koc) is <17.8, logKoc <1.25.

Key value for chemical safety assessment

Koc at 20 °C:
17.8

Additional information

The adsorption of the test material to soil was investigated in accordance with the standardised guidelines OECD 121 and EU Method C.19 under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria for assessing data quality set forth by Klimisch et al. (1997).

The soil adsorption/desorption screening test was carried out using the HPLC estimation method at a column temperature of 30 °C in a mobile phase of methanol : reverse osmosis water (55:45 v/v).

As the test material is a salt of a dicarboxylic acid, testing was performed at a neutral pH with the test material in its ionised form only. To obtain the test material in non-ionised form would require testing to be performed at a strongly acidic pH (approximately 2), which was outside the specified pH range for testing (approximately pH 5.5 to 7.5).

 The adsorption coefficient (Koc) of the test material has been determined to be <17.8, logKoc <1.25.

The low result obtained by the HPLC estimation method was consistent with the low partition coefficient.

 

In accordance with section 9.3.3 of column 2 of Annex IX of Regulation (EC) No 1907/2006, further information on adsorption/desorption may be required depending on the results of the study required at Annex VIII. As the screening study indicated a low potential for adsorption, it is therefore considered justified to omit this study as the endpoint has been adequately addressed with the available data.

[LogKoc: 1.25]