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EC number: 815-705-6 | CAS number: 17360-11-1
- 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
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 201 (Alga, Growth Inhibition Test)
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.3 (Algal Inhibition test)
- GLP compliance:
- yes (incl. QA statement)
- Analytical monitoring:
- yes
- Vehicle:
- no
- Test organisms (species):
- Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)
- Test type:
- static
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 72 h
- Test temperature:
- 20.4 – 22.8 °C
- pH:
- 7.3 - 9.2
- Nominal and measured concentrations:
- 1 / 3.2 / 10 / 32 / 100 mg/L nominal concentration
The measured concentrations lay between 94 % and 98 % of the nominal concentrations at the beginning of the test and between 99 % and 110 % of the nominal concentrations at the end of the test. Therefore, the biological results were based on the nominal concentrations. - Details on test conditions:
- For each treatment, 200 mL of the respective test item solution was mixed with the neces-sary amount of algal pre-culture (0.289 mL) to achieve a cell concentration of 2.7 *103 cells/mL. For the blank control, 350 mL nutrient medium was used instead of test item so-lution and mixed with the necessary amount of algal pre-culture (0.505 mL). In this mix-ture, the pH-value was measured.
The real cell concentration at the beginning of the test was measured with an electronic particle counter in the blank control solution. This measured value was used as start cell concentration for all replicates.
The test vessels were filled with 45 ± 1 mL of the respective test solution and incubated open (covered with perforated plastic foil acting as a stopper) for 72 hours, shaken on an orbital shaker to keep the algae in suspension. Before the start of incubation and every 24 hours, the cell number was determined with an electronic particle counter. After the test the pH value in treatments and blank control was measured again.
At the end of the test, the treatments were examined microscopically in order to assess the appearance of the algae and detect abnormalities (e.g. caused by the exposure to the test item).
The concentration of the test item in the test vessels was measured at the start and at the end of the test - Reference substance (positive control):
- yes
- Remarks:
- potassium dichromate
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC10
- Effect conc.:
- 13.58 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.:
- 2.7 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- cell number
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 100 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 27.07 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- cell number
- Validity criteria fulfilled:
- yes
- Conclusions:
- Based on the test results the ErC10, 72 h can be stated to be 13.58 mg/L and the ErC50, 72 h can be stated to be > 100 mg/L, respectively.
- Executive summary:
One valid experiment was performed.
The study was performed using 5 concentrations ranging from 1.0 to 100 mg/L (nominal). Incubation time (test system Desmodesmus subspicatus) was 72 hours. The cell concentration of each replicate was determined by measuring the cell numbers every 24 hours with an electronic particle counter. Growth rate µ and the yield[1]were determined from the cell number at the respective observation times.
Significant inhibition of algal growth was observed in all tested concentrations.
At the start and at the end of the test, the content of the test item in the test solutions was determined using HPLC.
The measured concentrations lay between 94 % and 98 % of the nominal concentrations at the beginning of the test and between 99 % and 110 % of the nominal concentrations at the end of the test. Therefore, the biological results were based on the nominal concentrations.
For the endpoint growth rate, inhibition at the highest concentration 100 mg/L was 27.6 %. Therefore the statistics program could not calculate an EC50. Hence for the Growth rate, the EC 50 value is specified as a range.
The 72h-EC50values of potassium dichromate (K2Cr2O7, CAS No. 7778-50-9) were determined in a separate reference test. The values lay within the range of the laboratory (growth rate 0.65 - 1.10 mg/L, yield 0.21 – 0.66 mg/L).
The following results for the test itemL-Tyrosine, 3,5-dinitro- (wet product)were determined:
Table 2 Results of the test item
Endpoint
NOEC
LOEC
EC10
EC50
Growth Rate
≤1 mg/L
< 1 mg/L
13.58 mg/L
> 100 mg/L
Yield
≤1 mg/L
< 1 mg/L
2.70 mg/L
27.07 mg/L
[1]Yield (according to OECD Guideline 201) is defined as the biomass at the end of the exposure period minus the biomass at the start of the exposure period. Calculation see under 8.2 Growth and growth inhibition are quantified from measurements of the algal biomass as a function of time. Algal biomass is defined as the dry weight per volume, e.g. mg algae/L test solution. However, dry weight is difficult to measure and therefore surrogate parameters are used. Of these surrogates, cell counts are most often used.
Reference
Table 1 Cell Number/mL
Nominal Concentration in mg/L |
Parameter |
Cell Number/mL |
|||
0 h |
24 h |
48 h |
72 h |
||
Blank control |
Mean |
2740 |
7780 |
67377 |
362663 |
Blank control |
SD |
0 |
1020 |
5412 |
4052 |
1 |
Mean |
2740 |
7027 |
51753 |
301813 |
1 |
SD |
0 |
926 |
9474 |
2826 |
3.2 |
Mean |
2740 |
6627 |
57860 |
310987 |
3.2 |
SD |
0 |
1026 |
5421 |
26670 |
10 |
Mean |
2740 |
5747 |
55527 |
282260 |
10 |
SD |
0 |
696 |
7072 |
17486 |
32 |
Mean |
2740 |
5140 |
25273 |
134967 |
32 |
SD |
0 |
1068 |
532 |
8167 |
100 |
Mean |
2740 |
5147 |
27060 |
94320 |
100 |
SD |
0 |
240 |
3912 |
6463 |
SD = Standard Deviation
Description of key information
One study was performed according to OECD 201.
Based on the test results the ErC10, 72 h can be stated to be 13.58 mg/L and the ErC50, 72 h can be stated to be > 100 mg/L, respectively.For the discussion of the classification see summary of aquatic toxicity.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 100 mg/L
- EC50 for marine water algae:
- 100 mg/L
- EC10 or NOEC for freshwater algae:
- 13.58 mg/L
- EC10 or NOEC for marine water algae:
- 13.58 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.
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