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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

The EC50 (emergence) and EC50 (growth based on final dry weight) for the test item based on nominal test concentrations for the three species tested were as follows:
SpeciesEC50 (emergence) (mg/kg)NOEC (mg/kg) EC50 (growth) (mg/kg)NOEC (mg/kg) *
Soybean>1000 >1000 >1000 >1000
Tomato>1000 >1000 >1000 >1000
Oat>1000 >1000 >1000 >1000
*NOEC (growth) based on the concentration where no significant effect was observed for dry weight compared to the solvent control and no morphological abnormalities were observed

Key value for chemical safety assessment

Short-term EC50 or LC50 for terrestrial plants:
1 000 mg/kg soil dw

Additional information

A study was performed to assess the effects of the test item on the emergence and growth of three plant species. The method followed that described in the OECD Guidelines for Testing of Chemicals: Guideline 208: Terrestrial (Non-target) Plant Test: Seedling Emergence and Seedling Growth Test (July 2006). Study conducted in compliance with the Principles of Good Laboratory Practice (GLP) and reported with a valid GLP certificate.

 

Following a preliminary range-finding test, three plant species; two dicotylendonous species, soybean(Glycine max)and tomato(Lycopersicon esculentum)and one monocotylendonous species, oat(Avena sativa)were exposed to a single concentration of 1000mg/kg. The number of seedlings emerged and any mortalities and/or morphological abnormalities were determined daily for 21 days after 50% emergence in the control for each species.

 

Results

Analysis of the 25 g/250 ml solvent stock solution used to prepare the test concentrations on Day 0 showed a measured test concentration of 102% of nominal value and so the results are based on nominal test concentrations only.

 

The EC50 (emergence) and EC50 (growth based on final dry weight) for the test item based on nominal test concentrations for the three species tested were as follows:

Species

EC50(emergence) (mg/kg)

95%Confidence limits (mg/kg)

NOEC(mg/kg)

EC50 (growth) (mg/kg)

95%Confidence limits (mg/kg)

NOEC(mg/kg)*

Soybean

>1000

 

>1000

>1000

-

>1000

Tomato

>1000

-

>1000

>1000

-

>1000

Oat

>1000

-

>1000

>1000

-

>1000

*No Observed Effect Concentration (growth) based on the concentration where no significant effect was observed for dry weight compared to the solvent control and no morphological abnormalities were observed