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EC number: 417-040-3 | CAS number: -
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
The 48h EC50 (immobilisation) value for Coagulant 122 (solid) with Daphnia magna is >210 mg/l.
The study was conducted in accordance with EEC Methods for Determination of Ecotoxicity Annex to Directive 92/69/EEC (O.J. No. L383A, 29.12.92) Part C, Method 2 "Acute toxicity to Daphnia" and the OECD Guideline for Testing of Chemicals No. 202, Part I "Daphnia Acute Immobilisation Test".
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 210 mg/L
Additional information
Cumulative immobilisation results expressed in terms of mean measured concentration. Measured concentrations ranged from 90-108 % of nominal at 0 hours and 30-90 % of nominal at 48 hours.
| Nominal concentration (mg/l) | Number of samples analysed | Mean measured concentration (mg/l) | % Nominal |
| Control | 2 | - | - |
| 10 | 2 | 3.8 | 38* |
| 22 | 2 | 5.7 | 26* |
| 46 | 2 | 25 | 54 |
| 100 | 2 | 82 | 82 |
| 220 | 2 | 211 | 96 |
* 48 hr values for mean measured calculations assumed to 1.6 mg/l (limit of detection).
Analysis of the immobility data gave the following results:
| Time (h) | EC50 (mg/l) | 95% confidence limits (mg/l) |
| 24 | >210 | - |
| 48 | >210 | - |
Highest test concentration resulting in 0% immobilisation: ≥210 mg/1
Lowest test concentration resulting in 100% immobilisation: >210 mg/1
Individual pH, temperature and dissolved oxygen values remained within acceptable limits throughout
the duration of the study (table represent mean values):
| Nominal concentration (mg/l) | Measured concentration (mg/l) | Mean values | ||
| pH | mgO2/l | T°C | ||
| Control | Control | 7.6 | 8.6 | 21 |
| 10 | 3.8 | 7.6 | 8.5 | 21 |
| 22 | 5.7 | 7.3 | 8.3 | 21 |
| 46 | 25 | 7.5 | 7.8 | 21 |
| 100 | 82 | 7.5 | 7.8 | 21 |
| 220 | 210 | 7.8 | 7.7 | 21 |
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