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EC number: 250-954-9 | CAS number: 32210-23-4
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- 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
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- From 07.01.1997 to 10.01.1997
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- This study was performed according to EU Method C.3 with GLP statement. All validity criteria were fulfilled but pH of the control medium was increased by more than 1.5 units during the test.
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.3 (Algal Inhibition test)
- Deviations:
- yes
- Remarks:
- pH of the control medium was increased by more than 1.5 units during the test.
- Principles of method if other than guideline:
- Not applicable
- GLP compliance:
- yes
- Analytical monitoring:
- yes
- Details on sampling:
- A series of concentrations in deionised water (stock solution at 30.3 mg/L, test concentrations at 2.8, 5.7, 8.5, 14.2, 24.1 and 28.4 mg/L) was prepared. The analytical monitoring was carried out at 0, 24, 48 and 72 hours.
- Vehicle:
- no
- Details on test solutions:
- No data
- Test organisms (species):
- Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)
- Details on test organisms:
- TEST ORGANISM
- Common name: Scenedesmus subspicatus (CHODAT (86.81 SAG))
- Source (laboratory, culture collection): Institute of water, soil and air hygiene, Berlin
- Age of inoculum (at test initiation): no data - Test type:
- static
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 72 h
- Remarks on exposure duration:
- none
- Post exposure observation period:
- None
- Hardness:
- No data
- Test temperature:
- 23.3-23.8°C
- pH:
- 7.5-9.3
- Dissolved oxygen:
- No data
- Salinity:
- Not applicable
- Nominal and measured concentrations:
- - Nominal concentrations: 0.76, 1.5, 3.3, 6.8, 13.6 and 27.3 mg/L.
- Details on test conditions:
- TEST SYSTEM
- Test vessel: no data
- Aeration: yes
- Type of flow-through (e.g. peristaltic or proportional diluter): not applicable
- Renewal rate of test solution (frequency/flow rate): not applicable
- Initial cells density: 20 000 cells/mL
- No. of vessels per concentration (replicates): 5
- No. of vessels per control (replicates): 8
- No. of vessels per vehicle control (replicates): not applicable
GROWTH MEDIUM
- Standard medium used: yes
TEST MEDIUM / WATER PARAMETERS
According to EU Method C.3
OTHER TEST CONDITIONS
- Sterile test conditions: yes
- Adjustment of pH: no
- Light intensity and quality: ca. 8000 Lux
- Salinity (for marine algae): not applicable
EFFECT PARAMETERS MEASURED (with observation intervals if applicable) :
- Determination of cell concentrations: spectrophotometer (adsorption measured at 685 nm).
TEST CONCENTRATIONS
- Spacing factor for test concentrations: ca. 2
- Range finding study: no - Reference substance (positive control):
- no
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 22 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC10
- Effect conc.:
- 11 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Key result
- Duration:
- 72 h
- Dose descriptor:
- NOEC
- Effect conc.:
- 6.8 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Details on results:
- - Analytical monitoring: See table 6.1.5/1 in "Any other information on results incl. tables". The measured values after 72 hours were not greater by more than 20% of the fresh concentrations. Based on this information, the results were based on nominal concentration only.
- Cell density: See table 6.1.5/2 in "Any other information on results incl. tables". - Results with reference substance (positive control):
- Not applicable
- Reported statistics and error estimates:
- None
- Validity criteria fulfilled:
- yes
- Conclusions:
- On the basis of the growth rate, the 72h-ErC50 and 72h-ErC10 were determined to be 22 mg/L and 11 mg/L, respectively, based on nominal concentrations. The NOEC value was 6.8 mg/L based on cell growth.
- Executive summary:
This study was performed according to EU Method C.3 with GLP statement, to assess the algae growth inhibition of the test substance to Scenedesmus subspicatus under static condition during 72 hours.
A stability test was performed to measure the concentrations of the test substance in aqueous solution during 72 hours. Results show that the test substance is stable during the test duration.
On the basis of the growth rate, the 72h-ErC50 and 72h-ErC10 were determined to be 22 mg/L and 11 mg/L, respectively, based on nominal concentrations. The NOEC value was 6.8 mg/L based on cell growth.
All validity criteria were fulfilled but pH of the control medium was increased by more than 1.5 units during the test.
Reference
Table 6.1.5/1: Analytical monitoring
Stability control (mg/L) |
Actual concentration at 0h (mg/L) |
Measured concentration at 24h (mg/L) |
Measured concentration at 48h (mg/L) |
Measured concentration at 72h (mg/L) |
2.8 5.7 8.5 14.2 24.1 28.4 |
2.4 5.3 8.1 14.4 23.5 28.4 |
3.0 4.9 7.4 12.5 21.9 25.1 |
3.0 5.4 8.3 14.1 22.0 28.6 |
3.1 5.3 7.7 13.8 21.9 31.9 |
Stock solution test |
30.3 |
- |
- |
- |
Table 6.1.5/2: Cell densities during the test (cell x 10^4 /mL)
|
Repl. |
Control |
Test concentrations (mg/L) |
|||||
0.76 |
1.5 |
3.3 |
6.8 |
13.6 |
27.3 |
|||
Initial |
1 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
After 24 hours |
1 2 3 4 5 6 7 8 |
6 6 6 6 5 6 5 5 |
6 6 5 5 6
|
6 6 5 6 4 |
7 6 7 6 6 |
6 6 6 5 5
|
5 5 5 5 5 |
5 5 5 5 5 |
Mean SD |
6 0.5 |
6 0.5 |
5 0.8 |
6 0.5 |
6 0.5 |
5 0 |
5 0 |
|
After 48 hours |
1 2 3 4 5 6 7 8 |
30 27 26 28 28 28 27 27 |
38 38 37 30 31 |
38 36 36 38 36 |
37 40 35 37 41 |
38 37 36 37 40 |
20 21 25 25 26 |
6 7 6 7 6 |
Mean SD |
28 1.1 |
35 3.5 |
37 1 |
38 2.2 |
38 1.4 |
23 2.4 |
6 0.5 |
|
After 72 hours |
1 2 3 4 5 6 7 8 |
90 85 94 94 95 99 103 108 |
100 102 106 117 121 |
104 99 106 108 114 |
100 98 103 116 137 |
102 102 106 108 119 |
56 57 48 49 57 |
6 8 5 8 6 |
Mean SD |
96 6.8 |
109 8.3 |
106 4.9 |
111 14.5 |
107 6.2 |
53 4 |
7 1.2 |
Description of key information
EU Method C.3, GLP, key study, validity 2:
72h-ErC50 = 22 mg/L, based on nominal concentration;
72h-ErC10 = 11 mg/L, based on nominal concentration;
72h-NOEC biomass = 6.8 mg/L, based on nominal concentration.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 22 mg/L
- EC10 or NOEC for freshwater algae:
- 6.8 mg/L
Additional information
To assess the toxicity of the registered substance to aquatic algae, one key study is available. This study was performed according to EU Method C.3 (similar to OECD Guideline 201) with GLP statement
Scenedesmus subspicatus were exposed to a series of six test substance concentrations with one control, under static conditions during 72 hours.
A stability test was performed beside the study, to measure the concentrations of the substance in aqueous solution during 72 hours. Results show that the substance was stable over the study period in the abiotic flasks, therefore concentrations were based on nominal values.
On the basis of the growth rate, the 72h-ErC50 and 72h-ErC10 were determined to be 22 mg/L and 11 mg/L. The NOEC value was 6.8 mg/L based on cell growth.
All validity criteria were fulfilled but pH of the control medium was increased by more than 1.5 units during the test.
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