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Toxicity to terrestrial plants

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Endpoint:
toxicity to terrestrial plants: short-term
Data waiving:
other justification
Justification for data waiving:
other:
Endpoint:
toxicity to terrestrial plants: short-term
Type of information:
experimental study
Adequacy of study:
disregarded due to major methodological deficiencies
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Only short abstract available
Qualifier:
according to
Guideline:
OECD Guideline 208 (Terrestrial Plants Test: Seedling Emergence and Seedling Growth Test)
Qualifier:
equivalent or similar to
Guideline:
other: EEC Directive 79/831 "Higher Plant Growth Test"
GLP compliance:
not specified
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
The justification for read-across is presented in Section 13 Assessment reports- Read-across justification.
Analytical monitoring:
no
Vehicle:
no
Species:
Avena sativa
Plant group:
Monocotyledonae (monocots)
Details on test organisms:
- Common name: oat
Species:
Lycopersicon esculentum
Plant group:
Dicotyledonae (dicots)
Details on test organisms:
- Common name: tomato
Species:
Raphanus sativus
Plant group:
Dicotyledonae (dicots)
Details on test organisms:
- Common name: radish
Test type:
early seedling growth toxicity test
Study type:
other: not reported
Substrate type:
not specified
Limit test:
no
Total exposure duration:
2 wk
Remarks:
The test was finished at least two weeks after five of the control seedlings have emerged.
Species:
Avena sativa
Duration:
2 wk
Dose descriptor:
NOEC
Effect conc.:
1 000 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth
Species:
Lycopersicon esculentum
Duration:
2 wk
Dose descriptor:
NOEC
Effect conc.:
300 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth
Species:
Lycopersicon esculentum
Duration:
2 wk
Dose descriptor:
LOEC
Effect conc.:
1 000 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth
Species:
Raphanus sativus
Duration:
2 wk
Dose descriptor:
NOEC
Effect conc.:
300 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth
Species:
Raphanus sativus
Duration:
2 wk
Dose descriptor:
LOEC
Effect conc.:
1 000 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth

The test was finished 2 weeks after five of the control seedlings have emerged in the control. Lycopersicon esculentum and Raphanus sativus were more sensitive with a NOEC of 300 mg/kg soil dw compared to Avena sativa with a NOEC of 1000 mg/kg soil dw.

Description of key information

No effects of the test substance on terrestrial plants are expected.

Key value for chemical safety assessment

Additional information

No studies on terrestrial toxicity are available for this substance.

Due to the high Koc a considerable adsorption to sediment and soil is indicated. However, the read-across substance EC 613 -848 -7 has been shown to be readily biodegradable. Therefore, no chronic exposure of terrestrial organisms is expected. In addition, Fatty acid esters are metabolised into fatty acids and alcohols. These components occur in sediment and soils naturally, are part of physiological pathways and can be used as energy source. The enzyme carboxylesterase is omnipresent in the environment, readily degrading this test substance. Thus, toxic effects caused by the metabolites of fatty acid esters are implausible.

Furthermore, an abstract of a terrestrial plant toxicity test (short-term, OECD 208, Kirch 1996) performed on the read-across substance Fatty acids, C14-18 and C16-18 unsatd., triesters with trimethylolpropane (CAS 68002-79-9) indicates no toxicity (NOEC = 300-1000 mg/kg soil dw, LOECs = 1000 mg/kg soil dw). In conclusion, due to a) the observed absence of toxicological effects on aquatic plants (assumption that soil toxicity expressed in terms of the freely-dissolved substance concentration in the pore water is the same as aquatic toxicity, ECHA Guidance on Information Requirements Chapter R.10), b) the lack of chronic exposure and c) the, acknowledged metabolisation of fatty acid esters, toxic effects to terrestrial plants can be excluded.

The justification for read-across is presented in Section 13 Assessment reports- Read-across justification.