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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

Earthworm reproduction (no. of progeny): 63-d EC50 = 776 mg/kg soil dw
Earthworm adult survival: 35-d LC50 > 1000 mg/kg soil dw

Key value for chemical safety assessment

Short-term EC50 or LC50 for soil macroorganisms:
776 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).

 

A chronic earthworm test was performed according to a guideline by Environment Canada (Stantec, 2006). The test species was Eisenia andrei. A series of 8 test item concentrations was tested (125 - 8000 mg/kg soil dw) in addition to a control. Analytical monitoring was performed. The recovery was poor (<= 28%), which is probably due to an insufficient analytical method; however, for earthworm testing analytical monitoring is not required according to OECD 222. After 35 d the adult survival was measured. After 63 d the effects on reproduction were determined (number of progeny, wet and dry mass of individual progeny). The report only contains EC25 and EC50 values; therefore the results are considered as acute effect values. The assessment is based on those endpoints which are considered in the relevant OECD 222 guideline (adult survival and number of progeny). The 35 -d LC50 (adult survival) was 4141 mg/kg soil dw. The EC50 for reproduction (no. of progeny) was 776 mg/kg soil dw and the EC25 171 mg/kg soil dw.

 

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.