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Ecotoxicological information

Toxicity to terrestrial arthropods

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Description of key information

Effect values (EC50, EC25) on collembolan adult survival and reproduction were > 1000 mg/kg soil dw.

Key value for chemical safety assessment

Short-term EC50 or LC50 for soil dwelling arthropods:
4 205 mg/kg soil dw

Additional information

In accordance with column 2 of REACH Annex IX and X, the toxicity testing to terrestrial organisms shall be proposed depending on the results of the chemical safety assessment. For substances being considered as „readily biodegradable“, it can be assumed that they will be completely biologically degraded within the STP process. Indirect exposure to soil is not likely e.g. via agricultural use of sewage sludge since 2,2'-iminodiethanol is readily biodegradable. Furthermore, for substances not passing the STP-process but being readily biodegradable, it can be assumed that they will be also biological degraded in the surface water within a short time. Direct exposure to soil is not likely, since the substance is not intentionally applied to soil. The substance has no potential to bioaccumulate nor is it considered as a PBT/vPvB substance. Adsorption to solid soil phase is not expected (log Koc < 3).

 

The long-term effects of DEA on the collembola Folsomia candida were studied in a chronic survival and reproduction test according to an Environment Canada method (Stantec, 2006). Adult Folsomia candida survival was adversely affected following exposure to DEA with a chronic LC50 of 8301 mg/kg soil dw. Chronic reproduction did not appear to follow a concentration-dependent pattern until exposed to the second highest DEA concentration (5000 mg/kg soil dw); the concentration-response curve was very steep between 1000 and 5000 mg/kg soil dw. The EC50 and EC25 for number of progeny produced were 4205 mg/kg soil dw and 2101 mg/kg soil dw, respectively. The study does not report NOEC or EC10 values; therefore, the EC50 values will be used for PNEC derivation as acute effect values.

 

The PNEC soil was derived based on experimental data only according to REACH Guidance R.10.6.2 as short-term data are available for producer, consumer, and decomposer.