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Three reliable studies are included on the read-across substances, fatty acids, C16-18 (even numbered) and C18 unsatd., reaction products with diethylene triamine, di-Me sulfate quaternized and Imidazolium compounds, 2-C17-unsatd.-alkyl-1-(2-C18-unsatd. amidoethyl)-4,5-dihydro-N-methyl, Me sul. oleic-acid based IQAC, DMS quaternised. Two of these studies assessed adsorption using the HPLC method and both determined adsorption coefficients of >427,000 (KOC) and >5.63 (Log Koc) at 25˚C and 35˚C. A third study used the batch equilibrium method and demonstrated that the compound adsorbed to all tested soils with Koc values above 135000. The test item showed a low desorption (0.05 to 0.7 %) during desorption kinetic experiments.

Based on this the test substance is expected to be highly adsorptive in soils and sediment, the adsorption will not be reversible and overall is immobile.

However, a cautionary note is added regarding the applicability of this method to surface active substances, such as these two read-across substances.

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