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EC number: 222-960-1 | CAS number: 3681-71-8
- Life Cycle description
- Uses advised against
- Endpoint summary
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- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
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Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The effect of the test item on the growth of Pseudokirchneriella subcapitata has been investigated according to OECD Guideline 201. Given the decline in measured test concentrations observed over the 72-h test period it was considered justifiable to base the results on the time-weighted mean measured test concentrations in order to give a "worst case" analysis of the data. The EC50 values for growth rate and yield were 85 and 47 mg/L respectively. The NOEC for both growth rate and yield was 23 mg/L.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 85 mg/L
- EC10 or NOEC for freshwater algae:
- 23 mg/L
Additional information
Introduction
A study was performed to assess the effect the test item in the growth of the green alga Pseudokirchneriella subcapitata. The method followed that described in the OECD Guidelines for Testing of Chemicals (2006) No 201, “Freshwater Alga and Cyanobacteria, Growth Inhibition Test” referenced as Method C.3 of Commission Regulation (EC) No 761/2009.
Methods
Pre-study solubility work conducted indicated that it was not possible to obtain a testable solution of the test item using traditional methods of preparation e.g. ultrsonication and high shear mixing.
A pre-study media preparation trial indicated that the use if a saturated solution method of preparation was most appropriate for this test item.
Following a preliminary range-finding test, Pseudokirchneriella subcapitata was exposed to solutions of the test item at 0-hour measured concentrations of 8.8, 18, 37, 79 and 158 mg/L (3 replicate flasks per concentration) for 72 h, under constant illumination and shaking at a temperature of 24 ± 1 °C. The test item solutions were prepared by stirring an excess of the test item in culture medium using a propeller stirrer at approximately 1500 rpm for 24 h. After the stirring period any undissolved test item was removed by filtration to produce a saturated solution of the test item. This saturated solution was then diluted as necessary to provide the test concentrations.
Samples of the algal populations were removed daily and cell concentrations determined for each control and treatment group, using a Coulter® Multisizer Particle Counter.
Results
Chemical analysis of the test preparations at 0 h showed measured test concentrations of 8.8, 18, 37, 79 and 158 mg/L were obtained.
Exposure of Pseudokirchneriella subcapitata to the test item gave the following results based on the 0-Hour measured test concentrations:
Response variable |
EC5- (mg/L) |
95 % Confidence Limits (mg/L) |
No observed Effect Concentration (NOEC) (mg/L) |
Lowest Observed Effect Concentration (LOEC) (mg/L) |
||
Growth Rate |
130 |
|
* |
|
37 |
79 |
Yield |
71 |
61 |
- |
83 |
37 |
79 |
*It was not possible to calculate 95 % confidence limits for the ErC50value as the data generated did not fit the models available for the calculation of confidence limits.
Analysis of the test preparations at 72 h showed a significant decline in measured test concentration in the range of less than the limit quantitation (LOQ) of the analytical method employed (which was determined to be 0.014 mg/L) to 0.071 mg/L.
Given that a decline in measured test concentration was observed during the range-finding test it was considered appropriate to prepare additional test samples at the start of the test which were incubated under test conditions prior to analysis at 24 and 48 h. Analysis of these additional test samples showed measured test concentrations to range from 87 % to 97 % of the 0-Hour measured test concentrations after 24 h and from 41 % to 99 % of the 0-Hour measured test concentrations after 48 h.
Given the decline in measured test concentrations observed over the 72-h test period it was considered justifiable to base the results on the time-weighted mean measured test concentrations in order to give a “worst case” analysis of the data.
Exposure of Pseudokirchneriella subcapitata to the test gave the following results based on the time-weighted mean measured test concentrations:
Response variable |
EC50 (mg/L) |
95 % Confidence Limits (mg/L) |
No observed Effect Concentration (NOEC) (mg/L) |
Lowest Observed Effect Concentration (LOEC) (mg/L) |
||
Growth Rate |
85 |
|
* |
|
23 |
53 |
Yield |
47 |
40 |
- |
56 |
23 |
53 |
*It was not possible to calculate 95 % confidence limits for the ErC50value as the data generated did not fit the models available for the calculation of confidence limits.
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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