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EC number: 206-982-9 | CAS number: 407-25-0
Toxicity to terrestrial plants
Administrative data
Link to relevant study record(s)
Description of key information
Two keys studies were performed according to OECD 208 guideline on three different species. The lowest EC50 was measured for shoot growth of mung bean at 4.7 mg/kg DW and the NOEC was determined at 0.83 mg/kg DW for the three species.
Key value for chemical safety assessment
- Short-term EC50 or LC50 for terrestrial plants:
- 4.7 mg/kg soil dw
- Long-term EC10, LC10 or NOEC for terrestrial plants:
- 0.83 mg/kg soil dw
Additional information
Two key studies were performed according to the testing OECD 208 guideline to measure the effect of sodium trifluoroacetate (NaTFA) in soil on seed germination and early plant growth of Sunflower (Helianthus annuus), Mung Bean (Phaseolus aureus) and Wheat (Triticum aestivum). Nine seeds per pot, in four replicates were sown in soil containing nominal concentrations of 1, 10, 100 and 1000 mg sodium trifluoroacetate / kg (dry soil) plus control.
There were statistically significant decreases in the proportion of seeds which had germinated and emerged after 14 days and the EC50s for germination were as follows:
- Sunflower : EC50 germination = 250 mg NaTFA/kg (208 mg TFA/kg);
- Mung Bean : EC50 germination = 770 mg NaTFA/kg (640.8 mg TFA/kg);
- Wheat: EC50 germination= 1000 mg/kg NaTFA/kg.
At the end of the test, 28 days after the seeds were sown, the mean fresh weight of the seedling shoots (cropped at soil level) were significantly reduced and the calculated EC50 for growth, based on nominal concentrations were as follows:
- Sunflower : EC50, Shoot growth (28d) = 12 mg NaTFA/kg (10 mg TFA/kg);
- Mung Bean : EC50, Shoot growth (28d) = 5.7 mg NaTFA/kg dry soil (4.7 mg TFA/kg);
- Wheat: EC50 Shoot growth (28d) = 12 mg NaTFA/kg dry soil (10 mg TFA/kg dry soil).
There was no significant effect on shoot weight at 1 mg NaTFA/kg and therefore :
- Sunflower : NOEC shoot weight (28d) < 1 mg NaTFA/kg (< 0.83 mg TFA/kg);
- Mung Bean : NOEC shoot weight (28d) = 1 mg NaTFA/kg dry soil (0.83 mg TFA/kg);
- Wheat: NOEC shoot weight (28d) = 1 mg NaTFA/kg dry soil (= 0.83 mg TFA/kg dry soil).
The toxicity of TFA is mainly observed when the seeds are sown and resulted in a reduced shoot growth. The germination is also impacted but at a lowest level. A NOEC of 1 mg/ kg dry soil NaTFA corresponding to 0.83 mg/kg dry soil TFA is safe for both stage.
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