Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The substance is inherently degradable. 54 % are biodegraded (to CO2) within 28 d in a test for ready biodegradability under its strict conditions, so that it can be assumed that Resin 835A is completely mineralized in a WWTP by adapted microorganisms and only a negligible concentration is expected in the effluent and thereby in the receiving river.

But even if no or an ineffective WWTP would be assumed, a concentration of 5 mg/18000 m3 corresponding to 2.8.10-7mg/l is calculated for the receiving water, that is according to EUSES a small ditch having by default a flow of 18000 m3/d. This concentration in the receiving river again is considered to be negligible. Using more realistic flow rates of receiving rivers at industrial sites and an effective WWTP would results in a concentration in fresh water of probably far below 10-10 mg/l.

The logPow of Resin 835A is high if the Resin is in the undissociated state. The dissociation constant was calculated to 5.1 so that at environmentally relevant pH in the neutral range the sparingly dissoluted substance will be in the dissociated state, which would result in a much lower logPow. Although formally a candidate for a bioaccumulative substance it is under realistic conditions probably not bioaccumulative.

This matches with the determined relatively low adsorption coefficient of logKoc of >0.9 to <2 at pH 6.5 (an environmentally relevant pH). The adsorption coefficient points to a ca. 10 to 100 times higher concentration in sediment and soil than in water, so that the concentrations in soil and sediment are still very low and are also considered to be insignificant.

Resin 835A has a vapour pressure of ≤0.0001 Pa at 25 °C. A relevant evaporation and a transport of the substance by air is therefore considered to be not relevant.

As Resin 835A is a sticky substance produced and used as flakes, no dust and no transfer of dust by air is expected.