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Diss Factsheets

Ecotoxicological information

Toxicity to terrestrial plants

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Endpoint:
toxicity to terrestrial plants: long-term
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Justification for type of information:
Refer to the Category Approach Justification document provided in IUCLID6 Section 13.
Qualifier:
according to guideline
Guideline:
other: proposed procedure for phytotoxicity testing on Avena sativa and Brassica rapa, 14 d, UBA Berlin, 3/1984
Principles of method if other than guideline:
14-d phytotoxicity test
GLP compliance:
no
Analytical monitoring:
not specified
Vehicle:
not specified
Species:
Brassica rapa
Plant group:
Dicotyledonae (dicots)
Details on test organisms:
- Common name: field mustard
- Plant family: Brassicaceae
Test type:
other: seedling emergence and growth
Study type:
laboratory study
Substrate type:
artificial soil
Limit test:
no
Total exposure duration:
14 d
Species:
Brassica rapa
Duration:
14 d
Dose descriptor:
EC0
Effect conc.:
> 1 000 other: mg/kg soil
Conc. based on:
act. ingr.
Basis for effect:
other: seedling emergence and growth
Endpoint:
toxicity to terrestrial plants: short-term
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
Refer to the Category Approach Justification document provided in IUCLID6 Section 13.
Reason / purpose for cross-reference:
read-across source
Species:
Brassica rapa
Duration:
14 d
Dose descriptor:
EC0
Effect conc.:
> 1 000 other: mg/kg soil
Conc. based on:
act. ingr.
Basis for effect:
other: seedling emergence and growth

Description of key information

14d EC0 (Brassica rapa, seedling emergence and growth) > 1000 mg/kg soil d.w. (nominal concentration, UBA Berlin, 3/1984)

Key value for chemical safety assessment

Additional information

In accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a read-across to another structurally related substance was conducted. Read-across data available for C16-18AS Na (CAS 68955-20-4) were used, since toxicity of alkyl sulfates is dependent on the carbon chain length.

One reliable study with terrestrial plants is available for C16-18AS Na (CAS 68955-20-4). The key non-GLP study followed the procedure for phytotoxicity testing on Avena sativa and Brassica rapa, 14 d, UBA Berlin, 3/1984 (Steber 1988). Plants were exposed to the test substance for 14 days in artificial soil. The 14-day EC0 value for Brassica rapa based on seedling emergence and growth was above 1000 mg a.i./kg soil d.w (nominal concentration).

Besides, the Equilibrium Partitioning Method is sufficient to calculate the PNECs values for the terrestrial compartment. The substance exhibits an adsorption coefficient (log Koc) below 5 and is readily biodegradable. In case of exposure to soil, the substance is expected to rapidly degrade, thus the hazard to terrestrial organisms is negligible. Hence, the Equilibrium Partitioning Method is sufficient to calculate the PNECs values for the terrestrial compartment according to the “Guidance on information requirements and chemical safety assessment Chapter R.7c: Endpoint specific guidance”, Section 7.11.6 Integrated Testing Strategy for Effects on Terrestrial Organisms (ECHA 2008).