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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Administrative data

Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
(Q)SAR
Adequacy of study:
disregarded due to major methodological deficiencies
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model, but not (completely) falling into its applicability domain, and documentation / justification is limited

Data source

Reference
Reference Type:
other: QSAR model
Title:
Daphnia Magna LC50 48h (EPA) 1.0.7

Materials and methods

Test guideline
Qualifier:
equivalent or similar to
Guideline:
other: ECHA guidance on information requirements and chemical safety assessment Chapter R.6: QSARs and grouping of chemicals.

Test material

Reference
Name:
Unnamed
Details on test material:
The SMILES included in the reference substance linked in Section 1 (General information) was used as model input.

Test organisms

Test organisms (species):
Daphnia magna

Test conditions

Details on test conditions:
The applicability domain of predictions is assessed using an Applicability Domain Index (ADI) that has values from 0 (worst case) to 1 (best case). The ADI is calculated by grouping several other indices, each one taking into account a particular issue of the applicability domain. Most of the indices are based on the calculation of the most similar compounds found in the training and test set of the model, calculated by a similarity index that consider molecule's fingerprint and structural aspects (count of atoms, rings and relevant fragments).
For each index, including the final ADI, three intervals for its values are defined, such that the first interval corresponds to a positive evaluation, the second one corresponds to a suspicious evaluation and the last one corresponds to a negative evaluation.


List of indices:
- Similar molecules with known experimental value.
- Accuracy of prediction for similar molecules.
- Concordance for similar molecules.
- Maximum error of prediction among similar molecules.
- Atom Centered Fragments similarity check.
- Model descriptors range check.
- Global AD Index.

Results and discussion

Effect concentrations
Key result
Duration:
48 h
Dose descriptor:
LC50
Effect conc.:
ca. 0.21 mg/L

Any other information on results incl. tables

The result appears non-reliable as the predicted compound is outside the applicability domain of the model.

Applicant's summary and conclusion

Validity criteria fulfilled:
no
Conclusions:
The substance has a LC50 of ca. 0.21 mg/L.