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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Koc=20225 (geometric mean of the two sludges and the two soils); read across MDEA-Esterquat C16-18 and C18 unsatd.
Koc=828 (geometric mean for the two sludges)
Koc=494 x 10³ (geometric mean for the two soils)

Key value for chemical safety assessment

Koc at 20 °C:
20 225

Additional information

No experimental data are available for the target substance MDEA-Esterquat C18 satd. However, a study on adsorption/desorption behaviour is available for the structurally related source substance MDEA-Esterquat C16 -18 and C18 unsatd. A justification for read-across is given in the general endpoint summary "Environmental fate and pathways".

The adsorption/desorption of MDEA-Esterquat C16-18 and C18 unsatd. was investigated in a study conducted according to OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method), US-EPA Pesticide Assessment Guidelines, Subdivision N. Chemistry: Environmental fate. Section 163-1. Leaching and adsorption/desorption studies; 1982), Commission Directive 95/36/EC amending Council Directive 91/414/EEC. Annex I, Section 7.1.2. Adsorption and desorption. Official Journal of the European Communities no L172 (1995), and EPA OPPTS 835.1110 (Activated Sludge Sorption Isotherm) using two sludges and three soils. The sludges were taken from wwtps treating predominantly domestic wastewater. The soils included a loamy sand (Speyer 2.2 soil), a sandy loam (Speyer 2.3 soil) and a clay (Speyer 6S).During the stability test and the adsorption/desorption kinetic experiment it was found that [Me-14C] MDEA-Esterquat C16-18 and C18 unsatd. was not fully stable under the experimental conditionsbased on TLC results. Therefore, the results described should be applied to[Me-14C] MDEA-Esterquat C16-18 and C18 unsatd. and its degradation products. A Koc=20225 was calculated as the geometric mean of the two sludges and the two soils whereas a Koc=828 was calculated as geometric mean for the two sludges and a Koc=494 x 10³ as geometric mean for the two soils. According to the classification of Blume & Ahlsdorf (1993), these results indicate a high sorption onto sludges and a very high sorption onto soil. As MDEA-Esterquat C16-18 and C18 unsatd.  is readily biodegradable under aerobic conditions, highly biodegradable under anaerobic conditions and not fully stable in the presence of sludges and soils as could be shown during the adsorption/desorption study it can be assumed that both in sludges and soils degradation takes place and decreased the potential for geoaccumulation significantly.