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EC number: - | CAS number: -
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
- Endpoint:
- short-term toxicity to aquatic invertebrates
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- REPORTING FORMAT FOR THE ANALOGUE APPROACH
1. HYPOTHESIS FOR THE ANALOGUE APPROACH
This read-across is based on the hypothesis that source and target substances have similar (eco)toxicological properties because
• they share structural similarities with common functional groups: One quaternised ethanolamine moiety, one to three, mainly two ester groups with a typical UVCB distribution with long-chain fatty acids of natural origin. The molecular structure is almost identical.
• they are manufactured from similar resp. identical precursors (triethanolamine, long-chain fatty acids, dimethyl sulphate) under similar conditions. Therefore common breakdown products via physical and biological processes, which result in structurally similar chemicals are evident
• A constant pattern in the changing of the potency of the properties across the TEA-Esterquats by chain-length and the grade of esterification is not observed, because the fatty acid chain-length distribution is too narrow and similar and the distribution of mono-, di-, and tri-esters is identical. Some variation caused by variation in C=C double bonds may occur and will be discussed at the relevant endpoint.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
See justification for read-across attached to chapter 13 of this IUCLID file.
3. ANALOGUE APPROACH JUSTIFICATION
See justification for read-across attached to chapter 13 of this IUCLID file.
4. DATA MATRIX
See justification for read-across attached to chapter 13 of this IUCLID file. - Reason / purpose for cross-reference:
- read-across: supporting information
- Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across source
- Key result
- Duration:
- 48 h
- Dose descriptor:
- EC50
- Effect conc.:
- 2.23 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- act. ingr.
- Basis for effect:
- mobility
- Remarks on result:
- other: source substance
- Remarks:
- partially unsaturated TEA-Esterquat
- Duration:
- 48 h
- Dose descriptor:
- EC50
- Effect conc.:
- 6.05 mg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- mobility
- Remarks on result:
- other: source substance
- Remarks:
- partially unsaturated TEA-Esterquat
Reference
Description of key information
48 h EC50 = 2.23 mg a.i./L (EU method C.2, Daphnia magna); GLP; RL1; read-across: partially unsaturated TEA-Esterquat
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 2.23 mg/L
Additional information
No experimental data on the short-term toxicity to aquatic invertebrates are available for the target substance C18 and C18 unsatd. TEA-Esterquat. However, reliable relevant data are available for the closely related source substance partially unsaturated TEA-Esterquat.
A justification for read-across is attached to Iuclid section 13.
The 48 hr acute toxicity of partially unsaturated TEA-Esterquat (solvent free) to water flea (Daphnia magna) according to EU Method C.2 (Acute Toxicity for Daphnia) was studied under static conditions. Daphnids were exposed to control, and partially unsaturated TEA-Esterquat (solvent free) at nominal concentration of 1, 2.2, 4.84, 10.6, 23.4, 51.5, 113 mg test mat./L for 48 hr. Mortality/immobilization was observed daily. The 48 hour EC50 was 2.23 mg a.i./L. The effect concentration was corrected for the analytical recovery of 93%.
In a supporting study, the 48 hr acute toxicity of partially unsaturated TEA-Esterquat (CAS No. 157905-74-3) was investigated in a study conducted according to OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test). Under static conditions Daphnia magna were exposed to control and test chemical at nominal concentration of 0.2, 0.44, 0.97, 2.13, 4.69, 10.3, 22.7 mg/L (mean measured concentration: 0.09, 0.2, 0.43, 0.95, 2.1, 4.6, 10.1 mg/L). The mean concentrations during the test (mean of samples taken at 0 h and 48 h) were between 34.7 % and 51.7 % of nominal (average 44.5 %). Immobilization and sublethal effects were observed daily. The 48 hour EC50 based on mean measured concentrations was 6.05 mg/L.
The lowest 48 h EC50 in Daphnia was 2.23 mg a.i./L.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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