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Diss Factsheets
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EC number: 272-271-5 | CAS number: 68784-75-8
- 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
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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:
- 05 January 2010-08 January 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: This study has been performed according to OECD and/or EC guidelines and according to GLP principles
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 201 (Alga, Growth Inhibition Test)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.3 (Algal Inhibition test)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- ISO 8692 (Water Quality - Fresh Water Algal Growth Inhibition Test with Scenedesmus subspicatus and Selenastrum capricornutum)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: Guidance document on aquatic toxicity testing of difficult substances and mixtures, OECD series on testing and assessment number 23, December 14, 2000.
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Analytical monitoring:
- yes
- Details on sampling:
- - Concentrations:all test concentrations and the control. In addition, the filter used for preparation of the test solutions was retained for possible analysis of the undissolved residue
- Sampling method:
Frequency at t=0h, t=24h and t=72h
Volume 4.8 ml
Storage Samples were stored in a freezer until analysis.
At the end of the exposure period, the replicates with algae were pooled at each concentration before sampling. - Vehicle:
- no
- Details on test solutions:
- Preparation started with a loading rate of 100 mg/l applying one day of magnetic stirring to reach maximum solubility of the test substance in the test medium. The obtained aqueous mixture was filtered through a 0.45 µm membrane filter (Whatman, rc 55) and the clear and colourless filtrate was used as the highest test concentration. The lower test concentrations were prepared by subsequent dilutions of the filtrate in test medium.
- Test organisms (species):
- Raphidocelis subcapitata (previous names: Pseudokirchneriella subcapitata, Selenastrum capricornutum)
- Details on test organisms:
- TEST ORGANISM
- Common name: Pseudokirchneriella subcapitata
- Strain: NIVA CHL 1
- Source (laboratory, culture collection): In-house laboratory culture
- Age of inoculum (at test initiation): 4 days before the start of the test, cells from the algal stock culture were inoculated in culture medium at a cell density of 1 x 10E4 cells/ml.
- Method of cultivation: Algae stock cultures were started by inoculating growth medium with algal cells from a pure culture on agar. The suspensions were continuously aerated and exposed to light in a climate room at a temperature of 21-24°C. - Test type:
- static
- Water media type:
- freshwater
- Limit test:
- yes
- Total exposure duration:
- 72 h
- Hardness:
- 0.24mmol/l (24 mg CaCO3/l)
- Test temperature:
- between 21.6 and 23.9°C
- pH:
- Between 7.8 - 8.1
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- The measured concentration of Barium in the samples taken from the undiluted filtrate at the start of the test was 0.79 mg/l. This concentration remained stable throughout the test period (97-98% of initial). The concentration of Lead was below or just above the linear range of the calibration curve. The analysis of the filter used for the preparation of the highest test concentration showed a relatively high content of lead.
- Details on test conditions:
- TEST SYSTEM
- Type: open
- Material, size, headspace, fill volume: 100 ml, normal headspace, 50 ml
- Aeration: no
- Initial cells density: 10000 cells/ml
- Control end cells density: 1178000 cells/ml
- No. of vessels per concentration (replicates): 6 for the highest concentration, 3 for the lowertest concentrations
- No. of vessels per control (replicates): 1 6
GROWTH MEDIUM
- Standard medium used: yes
OTHER TEST CONDITIONS
- Sterile test conditions: no
- Adjustment of pH: no
- Photoperiod: continuous
- Light intensity and quality: TLD-lamps of the type ‘Cool-white’ of 30 Watt, with a light intensity within the range of 68 to 77 µE/m2/s
EFFECT PARAMETERS MEASURED (with observation intervals if applicable) :
72 h NOErC, 72 h NOEbC, 72 h ErC50, 72 h EbC50
TEST CONCENTRATIONS
- Spacing factor for test concentrations: 10
- Test concentrations: 0, 0.10, 1.0, 10 and 100% of a filtered solution prepared at a loading rate of 100 mg/l - Reference substance (positive control):
- yes
- Remarks:
- potassium dichromate
- Duration:
- 72 h
- Dose descriptor:
- NOEC
- Effect conc.:
- 100 other: mg/l (loading rate)
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Remarks on result:
- other: 100% of the filtered solution prepared at a loading rate of 100 mg/l
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 100 other: mg/l (loading rate)
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Remarks on result:
- other: 100% of 0.45 µm filtered solution prepared at a loading rate of 100 mg/l
- Duration:
- 72 h
- Dose descriptor:
- NOEC
- Effect conc.:
- 100 other: mg/l (loading rate)
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- other: yield
- Remarks on result:
- other: 100% of 0.45 µm filtered solution prepared at a loading rate of 100 mg/l
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 100 other: mg/l (loading rate)
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- other: yield
- Remarks on result:
- other: 100% of 0.45 µm filtered solution prepared at a loading rate of 100 mg/l
- Duration:
- 72 h
- Dose descriptor:
- NOEC
- Effect conc.:
- 0.79 mg/L
- Nominal / measured:
- meas. (initial)
- Conc. based on:
- element
- Remarks:
- dissolved barium in filtrate
- Basis for effect:
- growth rate
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 0.79 mg/L
- Nominal / measured:
- meas. (initial)
- Conc. based on:
- element
- Remarks:
- dissolved barium in filtrate
- Basis for effect:
- growth rate
- Duration:
- 72 h
- Dose descriptor:
- NOEC
- Effect conc.:
- 0.79 mg/L
- Nominal / measured:
- meas. (initial)
- Conc. based on:
- element
- Remarks:
- dissolved barium in filtrate
- Basis for effect:
- other: yield
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 0.79 mg/L
- Nominal / measured:
- meas. (initial)
- Conc. based on:
- element
- Remarks:
- dissolved barium in filtrate
- Basis for effect:
- other: yield
- Details on results:
- - Exponential growth in the control (for algal test): yes
- Effect concentrations exceeding solubility of substance in test medium: yes
No significant differences were recorded between the values for growth rate or yield at any of the test concentrations when compared to the control group.
Microscopic observations at the end of the test revealed a normal and healthy appearance of the exposed cells when compared to the control. - Results with reference substance (positive control):
- - Results with reference substance valid: yes
- EC50:
The EC50 for growth rate reduction (ERC50: 0-72h) was 1.2 mg/l with a 95% confidence interval ranging from 0.65 to 2.3 mg/l.
The EC50 for yield inhibition (EYC50: 0-72h) was 0.65 mg/l with a 95% confidence interval ranging from 0.31 to 1.3 mg/l. - Validity criteria fulfilled:
- yes
- Conclusions:
- Under the conditions of the present study Silicic acid(H2Si2O5), barium salt(1:1), lead-doped did not reduce growth rate or inhibit yield of Pseudokirchneriella subcapitata exposed to a filtered solution prepared at a loading rate of 100 mg/l. The actual concentration of dissolved Barium in this filtrate was 0.79 mg/l.
The 72h-EC50 for both growth rate reduction and yield inhibition was beyond the range tested and therefore exceeded the solubility limit of Silicic acid(H2Si2O5), barium salt(1:1), lead-doped in test medium.
Reference
Description of key information
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 100 mg/L
- EC10 or NOEC for freshwater algae:
- 100 mg/L
Additional information
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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