Registration Dossier

Ecotoxicological information

Toxicity to terrestrial plants

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Additional information

In accordance with column 2 of REACH Annex IX and X, studies on terrestrial toxicity do not need to be conducted as direct and indirect exposure of the soil compartment is unlikely. Furthermore, definitive screening studies with three different plants (Alfalfa, barley and northern wheatgrass) were conducted.

In a seedling emergence and seedling growth study, Medicago sativa (alfalfa; 21 days exposure), Hordeum vulgare (barley; 14 days exposure) and Elymus lanceolatus (northern wheatgrass; 21 days exposure) were exposed in artificial soil to the test substance at concentrations of 0 (control), 1600, 2200, 3520, 4840, 7744, 10648, 17037, 23426, 35138 and 46851 mg/kg (PTAC, 2006). 40 plants up to 7744 mg/kg and 30 plants from 10648 to 46851 mg/kg were used (10 plants per replicate). 60 plants were used as control. Recovery of the test substance in the northern wheatgrass test ranged from 73 to 103% for all treatments. Loss also occurred over time since measurable concentrations of TEG were detected in the two highest exposure concentrations (10,648 and 46,851 mg/kg) only. The recovery efficiencies decreased from Day 0 to both Day 7 and Day 21 but they did not necessarily appear to decrease between Days 7 and 21. Alfalfa emergence was affected adversely following exposure to the test substance resulting in an EC50 of 19,721 mg/kg and IC50s ranged from 8195 to 15,613 mg/kg for shoot dry mass and shoot length, respectively. There was no effect of exposure to the test substance on barley seedling emergence. The IC50s ranged from 8083 to 23,068 mg/kg for shoot dry mass and shoot length endpoints, respectively. There was no effect of exposure to the test substance on northern wheatgrass seedling emergence. The IC50s ranged from 3982 to 10,880 mg/kg for root dry mass and root length endpoints, respectively.