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Environmental fate & pathways

Adsorption / desorption

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Description of key information

logKoc > 5.63

Key value for chemical safety assessment

Koc at 20 °C:
42 680

Additional information

One reliable key study is available for this endpoint. In this study, the determination of the adsorption coefficient (KOC) of TRIQUAT Monomer was performed according to the OECD Guideline for the Testing of Chemicals, No. 121, using the HPLC method, and in accordance with GLP.

The elution of the test item was not possible for methanol/water and acetonitrile/water with an isocratic HPLC method. To prove that the test item can be eluted from the CN column, an acidic eluent and a gradient HPLC method was used. In the present study the reference item covered the range up to log KOC 5.63. The retention times of the individual measurements of the test item were higher than the retention times of the individual measurements of the reference item. Therefore, the log of the adsorption coefficient (KOC) of TRIQUAT Monomer was estimated to be above 5.63, which is equal to a koc value above 42680.

It must be stated, that deviating from the Guideline (OECD No. 121), an ionizable substance was nottested with both ionised and non-ionised forms. It is not possible to test TRIQUAT Monomer in a non-ionized form, since it is a quarternary ammonium salt that cannot be found in a non-ionic form.