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EC number: 274-152-3 | CAS number: 69847-45-6
- 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:
- 24.07.2017 to 27.07.2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 201 (Freshwater Alga and Cyanobacteria, Growth Inhibition Test)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.3 (Algal Inhibition test)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 850.5400 (Algal Toxicity, Tiers I and II) (January 2012)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Analytical monitoring:
- yes
- Details on sampling:
- For determination of the test item concentrations, three replicate samples (5 mL per replicate) were taken from each test concentration and from the control at the start and at the end of the test.
- Vehicle:
- no
- Details on test solutions:
- The test solutions used in the test was prepared by mechanical dispersion without using any solubilising agents. A stock solution was first prepared by dissolving an amount of 0.08 g test item in 800 mL dilution water (OECD Medium) to obtain the nominal concentration of 100 mg/L. The test solutions of subsequent lower test concentrations were prepared by appropriate diluting of this stock solution.
- Test organisms (species):
- Raphidocelis subcapitata (previous names: Pseudokirchneriella subcapitata, Selenastrum capricornutum)
- Details on test organisms:
- TEST ORGANISM
- Common name: Raphidocelis subcapitata (Printz-Starr)
- Strain: 61.81 SAG (identical strains: CCAP 278/4; UTEX 1648; ATCC 22662)
- Source: SAG: Collection of Algal Cultures, Inst. Plant Physiology, University of Göttingen, Untere Karspüle 2, D-37073 Göttingen, Germany
- Method of cultivation: Small algal cultures that are regularly planted on agar are transferred to fresh medium at least once every two months under standardised conditions according to the test guidelines. Pre-culture was prepared with Algal Mineral Salts Culture Medium, incubated under the conditions of the test and used when still exponentially growing, normally after an incubation period of 2 - 4 days. - Test type:
- static
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 72 h
- Hardness:
- not specified
- Test temperature:
- 21.4 – 22.1°C (test vessel), 21.3 - 22.9°C (climate chamber)
- pH:
- 7.70 – 9.52 (control: 7.70 - 9.19)
- Dissolved oxygen:
- not specified
- Salinity:
- not applicable
- Conductivity:
- not specified
- Nominal and measured concentrations:
- Nominal concentrations of 6.25, 12.5, 25, 50 and 100 mg/L were investigated in the main study. Corresponding calculated geometric mean measured concentrations were: 0.79, 1.11, 1.53, 2.22 and 3.12 mg/L.
- Details on test conditions:
- TEST SYSTEM
- Test vessel: 250 mL Erlenmeyer flask
- Type: covered with air-permeable stoppers
- Medium volume per flask: 100 mL
- Initial cells density: 10^4 cells/mL
- Control end cells density: 143×10^4 cells/mL (mean value)
- No. of vessels per concentration (replicates): 3
- No. of vessels per control (replicates): 6
GROWTH MEDIUM
- Standard medium used: yes (OECD medium according to OECD 201)
OTHER TEST CONDITIONS
- Photoperiod: continuously
- Light intensity and quality: 7944 lux, fluorescent lamps
EFFECT PARAMETERS MEASURED:
- Determination of cell concentrations: counting chamber
- Morphological Changes of Algal Cells: microscopy
TEST CONCENTRATIONS
- Spacing factor for test concentrations: 2
- Range finding study: yes
- Test concentrations: 0.1, 1, 10 and 100 mg/L plus a control
- Results used to determine the conditions for the definitive study: growth inhibition of over 10% at test concentration 100 mg/L - Reference substance (positive control):
- yes
- Remarks:
- Potassium dichromate, test period: 07 – 10 March 2017
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 8.02 mg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 2.65 mg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC10
- Effect conc.:
- 2.22 mg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Duration:
- 72 h
- Dose descriptor:
- EC10
- Effect conc.:
- 1.08 mg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 6.83 mg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Remarks on result:
- other: calculated value for anhydrous substance
- Details on results:
- No morphological abnormalities were observed in the control and in the two lowest concentrations. Swollen and thin cells were observed in the concentrations of 1.53, 2.22 and 3.12 mg/L (measured) together with the normal cells during the test.
- Results with reference substance (positive control):
- The 72h ErC50: 0.99 mg/L (95 % confidence limits: 0.68 – 1.49 mg/L). The 72h EyC50: 0.59 mg/L (95 % confidence limits: 0.47 – 0.75 mg/L).
- Reported statistics and error estimates:
- For the determination of the LOEC and NOEC, the calculated mean growth rates and yield at the test concentrations were tested on significant differences to the control values using analysis of variance (ANOVA) and Dunnett’s test (α = 0.05; 2-sided) by SPSS software. The ECx values and their confidence limits for growth rate and yield were calculated using Probit analysis by SPSS software.
- Validity criteria fulfilled:
- yes
- Conclusions:
- In this 72-h algal growth inhibition test the effects of the test item on the growth of Raphidocelis subcapitata was determined. The 72-h EC10, EC20 and EC50 for growth were determined to be 2.22, 3.45 and 8.02 mg/L (hydrated substance), and 1.89, 2.94 and 6.83 mg/L (calculated value for anhydrous substance), respectively. The 72-h EC10, EC20 and EC50 for yield were determined to be 1.08, 1.47 and 2.65 mg/L,(hydrated substance), and 0.92, 1.25 and 2.26 mg/L (calculated value for anhydrous substance), respectively. The results are based on measured geometric mean test item concentrations.
- Executive summary:
The purpose of this study was to determine the effect of the test item on the growth of a unicellular green algal species Raphidocelis subcapitata. Exponentially growing cultures of Raphidocelis subcapitata were exposed to test item concentrations of 6.25, 12.5, 25, 50 and 100 mg/L ((corresponding to 0.79, 1.11, 1.53, 2.22 and 3.12 mg/L (geometric mean measured concentrations)). The algal growth in relation to a control culture was determined over a fixed test period of 72 hours. The 72-h EC10, EC20 and EC50 for growth were determined to be 2.22, 3.45 and 8.02 mg/L (hydrated substance), and 1.89, 2.94 and 6.83 mg/L (calculated value for anhydrous substance), respectively. The 72-h EC10, EC20 and EC50 for yield were determined to be 1.08, 1.47 and 2.65 mg/L,(hydrated substance), and 0.92, 1.25 and 2.26 mg/L (calculated value for anhydrous substance), respectively. The results are based on measured geometric mean test item concentrations.
Reference
Description of key information
The effect of the test item on the growth of a unicellular green algal species Raphidocelis subcapitata was determined according to OECD 201, Regulation (EC) No. 226/2016 Method C.3 and EPA OPPTS 850.5400 and under GLP (reference 6.1.5-1). The study was conducted under static conditions with an initial cell density of 1x10^4 cells/mL for a period of 72 hours. The 72-h EC10, EC20 and EC50 for growth were determined to be 2.22, 3.45 and 8.02 mg/L (hydrated substance), and 1.89, 2.94 and 6.83 mg/L (calculated value for anhydrous substance), respectively. The 72-h ErC50 and ErC10 were chosen as key values.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 6.83 mg/L
- EC10 or NOEC for freshwater algae:
- 1.89 mg/L
Additional information
The effect of the test item on the growth of a unicellular green algal species Raphidocelis subcapitata was determined according to OECD 201, Regulation (EC) No. 226/2016 Method C.3 and EPA OPPTS 850.5400 and under GLP (reference 6.1.5-1). The study was conducted under static conditions with an initial cell density of 1x10^4 cells/mL for a period of 72 hours. Five concentrations were tested in a geometrical series with a dilution factor of 2: 6.25, 12.5, 25, 50 and 100 mg/L ((corresponding to 0.79, 1.11, 1.53, 2.22 and 3.12 mg/L (calculated geometric mean concentrations)). The 72-h EC10, EC20 and EC50 for growth were determined to be 2.22, 3.45 and 8.02 mg/L (hydrated substance), and 1.89, 2.94 and 6.83 mg/L (calculated value for anhydrous substance), respectively. The 72-h EC10, EC20 and EC50 for yield were determined to be 1.08, 1.47 and 2.65 mg/L,(hydrated substance), and 0.92, 1.25 and 2.26 mg/L (calculated value for anhydrous substance), respectively. The results are based on measured geometric mean test item concentrations. The 72-h ErC50 and ErC10 were chosen as key values.
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