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Toxicity to terrestrial plants

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Description of key information

Effect values (EC50, EC25) in a seedling emergence test (Alfalfa, Barley, Northern Wheatgrass) were > 1000 mg/kg soil dw.

Key value for chemical safety assessment

Additional information

In a publication by Bergmann and Eckert (1990) the effect of 2 -aminoethanol on the growth and development of barley and rye was investigated. The applied use rates resulted in a promotion of basal stem growth and an increased grain yield. In another publication by Bergmann et al. (1991), the effect of 2 -aminoethanol on the grain yield of barley, rye and wheat was evaluated. Again 2 -aminoethanol had a stimulating effect on grain production. Adverse effects due to the exposure to 2 -aminoethanol were not described.

 

A seedling emergence study with three plant species (dicots: Alfalfa; monocots: Barley, Northern Wheatgrass) was performed according to a guideline by Environment Canada (Stantec, 2006). A series of 10 test item concentrations was tested (333 - 12815 mg/kg soil dw) in addition to a control. Analytical monitoring was not performed. Observed endpoints were emergence, shoot length and mass as well as root length and mass. Only those endpoints are evaluated which are in accordance with OECD 208: emergence, shoot length and biomass. Effects on Alfalfa and Northern Wheatgrass were determined after 21 d of exposure, while the exposure period of Barley was 14 d. The report only contains EC25 and EC50 values; therefore the results are considered as acute effect values. Stimulation in growth was observed for all three species at the lower test concentrations (up to 1688 mg/kg soil dw); however, the response in Alfalfa was only observed in one test concentration, while the other two species showed this effect in a series of concentrations.

It can be concluded that Alfalfa was the most sensitive species to MEA (EC50 = 1290 mg/kg soil dw, shoot dry mass). All observed effect values were above the normally used highest tested concentration of 1000 mg/kg soil dw.

 

Moreover, the test substance is not supposed to be directly applied to soil and an indirect exposure to soil is unlikely since the substance is readily biodegradable. For substances being considered as readily biodegradable, it can be assumed that they will be biologically degraded within the STP process. In special cases, if the substance is not entering the STP process but is readily biodegradable, it can be assumed that it will be rapidly biological degraded in the surface water. In both cases, a transfer to the soil compartment is unlikely.

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.

Therefore, no additional tests on terrestrial plants are provided.