Registration Dossier

Ecotoxicological information

Toxicity to terrestrial plants

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

IC50 (14-day): 209 mg/kg dry weight, root dry mass, Hordeum vulgare, reliability 2, read-across from CAS: 541-02-6
EC50 (14-day): >4054 mg/kg dry weight, seedling emergence, root and shoot length and root and shoot dry mass, Trifolium pratense, reliability 2, read-across from CAS: 541-02-6

Key value for chemical safety assessment

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

Additional information

There are no data describing the long-term toxicity of the registered substance to terrestrial plants. However, data are available for the siloxane decamethylcyclopentasiloxane (D5, CAS: 541-02-6). A short-term (14-day) IC50value of 209 mg/kg dry weight has been determined for the effects of the test substance on root dry mass ofHordeum vulgare. IC50/EC50values for effects on seedling emergence, root and shoot length and shoot dry mass determined in the same test were ≥248 mg/kg dry weight. 14-day EC50values of >4054 mg/kg dry weight have been determined for the effects of the test substance on seedling emergence, root and shoot length and root and shoot dry mass ofTrifolium pratense. NOECs were not determined in the tests.

An OECD TG 208 toxicity to terrestrial plants study is proposed for the registration substance. The need for this study will be re-assessed once the results of the OECD TG 222 with the registration substance are available. If there is no indication of risk from the OECD TG 222 study, the OECD TG 208 will not be conducted.

Read-across of the terrestrial toxicity data for D5 to Silsesquioxanes, phenyl is considered to be suitable to derive an interim hazard and risk assessment under REACH.

Refer to Section 6.3 for further discussion.