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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The acid component of the test substance was found to have log10Koc values of 2, <1.3 and <1.3 at pH 4, 7 and 9 respectively. The amine component of the test substance was found to have log10Koc values of 3.2, 2.4 and 2.2 at pH 4, 7 and 9, respectively.

Key value for chemical safety assessment

Koc at 20 °C:
20

Additional information

The soil adsorption coefficient of the test substance was determined in accordance with the OECD Guideline for Testing of Chemicals 121. The HPLC method was used to determine the log Koc value for the acid and amine components of the test substance. As the test substance contains ionisable components, the test was performed at pH 4, 7 and 9, covering the pH range of environmental release. This is in accordance with the requirements of the OECD Testing Guideline (121), which states that for ionisable substances both the ionised and non-ionised forms should be tested. Based on the dissociation constants of the acid and amine components of the test substance (previously determined via an experimental study and detailed in Section 4.2.1 of the IUCLID) this pH range ensures that the soil adsorption study took account of the ionised and non-ionised form. The acid component of the test substance was found to have log10Koc values of 2, <1.3 and <1.3 at pH 4, 7 and 9 respectively. The amine component of the test substance was found to have log10Koc values of 3.2, 2.4 and 2.2 at pH 4, 7 and 9, respectively. The adsorption/desorption coefficient of triethanolamine was determined via calculation of the ionized molecules and was found to be Koc = 17 (Log Koc = 1.24).

[LogKoc: 1.3]