Registration Dossier
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EC number: 253-775-4 | CAS number: 38083-17-9
Toxicity to terrestrial plants
Administrative data
Link to relevant study record(s)
Description of key information
The most sensitive acute effects were observed for the shoot dry weight of Brassica rapa in the chronic test according to ISO 22030 with an EC50 of 15 mg/kg dw.
The most sensitive chronic effects were observed for the number of husks, husk fresh weight and husk dry weight with a NOEC of 6.4 mg/kg dw.
Key value for chemical safety assessment
- Short-term EC50 or LC50 for terrestrial plants:
- 15 mg/kg soil dw
- Long-term EC10, LC10 or NOEC for terrestrial plants:
- 6.4 mg/kg soil dw
Additional information
The toxicity to terrestrial plants was investigated with two different tests - an acute test and a chronic test.
The chronic and acute toxicity of the test item to Avena sativa (monocots) and Brassica napus (dicots) was tested in a GLP study according to ISO 22030 (key, RL1, 2014) over 63 days (Avena sativa) and 42 days (Brassica rapa). According to the results of a range-finder, the test for the plant species oats was conducted at the test item concentrations 100 - 50 - 25 - 12.5 - 6.25 - 3.13 - 1.56 mg/kg soil dry weight (factor 2) and for the plant species turnip at the test concentrations 100 - 40 - 16 - 6.4 - 2.56 - 1.024 - 0.4096 mg/kg soil dry weight (factor 2.5). The most sensitive endpoint for acute toxicity was determined to be the shoot dry weight of Brassica rapa with an EC50 of 15 mg/kg dw. The most sensitive endpoints for chronic toxicity were determined to be number of husks, husk fresh weight and husk dry weight of Brassica rapa with a NOEC of 6.4 mg/kg dw. Avena sativa was observed to be less sensitive with an EC50 of 29.4 mg/kg dw for shoot dry weight and a most sensitive NOEC (number of blossoms) of 12.5 mg/kg dw.
Furthermore, an acute toxicity test with terrestrial plants was recently published by Richter et al. (2013). Due to the limited details on the study performance a reliability could not be assigned (RL4). In the short-term study according to ISO 11269 -2 two differnt terrestrial plants were tested in two differnt soils over 17 days. The most sensitive endpoint for Avena sativa is the biomass yield with an EC50 of 18.5 mg/kg dw tested in LUFA 2.3 soil. For Brassica napus the most sensitive endpoint is as well the biomass yield with an EC50 of 30.7 mg/kg dw tested in LUFA 2.3 soil. In the LUFA 2.3 soil with a higher soil pH of 6.8 a higher toxicity of the test item to both plants was observed, compared to the results obtained in the test with artificial soil with a pH of 6.0.
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