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EC number: 224-675-8 | CAS number: 4443-26-9
- 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
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 10-01-94 - 14-01-94
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: GLP study according to internationally accepted guideline. Measured concentrations in test solution deviate > 20% from nominal concentrations.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 994
- Report date:
- 1994
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 201 (Alga, Growth Inhibition Test)
- Deviations:
- no
- GLP compliance:
- yes
Test material
- Reference substance name:
- 1,3-dihydro-1,3-dioxo-2H-isoindole-2-hexanoic acid
- EC Number:
- 224-675-8
- EC Name:
- 1,3-dihydro-1,3-dioxo-2H-isoindole-2-hexanoic acid
- Cas Number:
- 4443-26-9
- Molecular formula:
- C14H15NO4
- IUPAC Name:
- 6-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)hexanoic acid
- Details on test material:
- Name of test material (as cited in study report): PAC
Lot/Batch number: R719
Purity: 95%
Water solubility: 200 mg/l
Constituent 1
Sampling and analysis
- Analytical monitoring:
- yes
Test solutions
- Vehicle:
- no
- Details on test solutions:
- 0.53 g of test material was dispersed in 1 litre of ISO medium to give a stock solution of 500 mg/l nominal concentration. High energy sonication was used to assure the homogeneity of the dispersion. NaOH 1 M was used to adjust the pH to 6.5. A range of test solutions with nominal concentration 32-320 mg/l were prepared by dilution of the stock solution.
Test organisms
- Test organisms (species):
- Raphidocelis subcapitata (previous names: Pseudokirchneriella subcapitata, Selenastrum capricornutum)
- Details on test organisms:
- TEST ORGANISM
- Strain: not reported
- Laboratory culture: Yes
- Source: not reported
- Age of inoculum (at test initiation): no data
- Method of cultivation: not reported
- Pre-treatment: 3 days before the experiment an inoculum was prepared and incubated under the test conditions
- Initial cell concentration: Average = 1.28 * 10E+04 cells/ml
Study design
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
Test conditions
- Test temperature:
- 19-24 °C
- pH:
- 7.0-7.6 at start of test
6.1-7.4 at end of test - Nominal and measured concentrations:
- Exposure concentrations vary more 20% from nominal values.
- Test concentrations - nominal: 0, 32, 56, 100, 180 and 320 mg/L
- Test concentrations - measured at 0h: 2.6, 30.2, 49.1, 86.5, 164.0, 286.6 mg/L
- Test concentrations - measured at 96h: 0, 0.2, 0, 39.1, 90.2, 225.0 mg/L - Details on test conditions:
- TEST SYSTEM
- Type (delete if not applicable): open
- Material, size, headspace, fill volume: no data
- Aeration: no data
- Initial cells density:Average = 1.28 * 10E+04 cells/ml
- Control end cells density: Cell concentration in control cultures increased at least by a factor of 16 within 3 days
- No. of vessels per concentration (replicates): 3
- No. of vessels per control (replicates): 6
GROWTH MEDIUM
- ISO medium
OTHER TEST CONDITIONS
- Photoperiod: no data
- Light intensity: not measured
EFFECT PARAMETERS MEASURED (with observation intervals if applicable) :
- Determination of cell concentrations: microscope with counting chamber
TEST CONCENTRATIONS
- Test concentrations - nominal: 0, 32, 56, 100, 180 and 320 mg/L
- Test concentrations - measured at 0h: 2.6, 30.2, 49.1, 86.5, 164.0, 286.6 mg/L
- Test concentrations - measured at 96h: 0, 0.2, 0, 39.1, 90.2, 225.0 mg/L - Reference substance (positive control):
- no
Results and discussion
Effect concentrationsopen allclose all
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 140 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Remarks on result:
- other: 110-180 95% CL
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 320 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 130 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Remarks on result:
- other: 110-150 95% CL
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 320 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 79 mg/L
- Nominal / measured:
- meas. (arithm. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Remarks on result:
- other: 65-97 95% CL
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 256 mg/L
- Nominal / measured:
- meas. (arithm. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Duration:
- 96 h
- Dose descriptor:
- NOEC
- Effect conc.:
- 56 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Duration:
- 96 h
- Dose descriptor:
- NOEC
- Effect conc.:
- 25 mg/L
- Nominal / measured:
- meas. (arithm. mean)
- Conc. based on:
- test mat.
- Details on results:
- Nominal concentrations: 96 h NOEC = 56 mg/l. The tested concentrations were 32, 56, 100, 180, 320 mg/l.
Since the concentrations decreased substantially during the 96 hour exposure period, effect concentrations based on nominal concentrations are probably an understimate of the toxicity of the test substance. A more relevant assessment would be to base the effects on mean measured concentrations. Although in this test this assessment is limited because the two lowest concentrations had fallen to zero, it is considered acceptable since inhibition of growth was probably only significant at 100 mg/l and above. Based on mean measured concentrations the 96 h EbC50 is 79 mg/L and ErC50 >256 mg/l. The 96 h NOEC was 25 mg/L also using mean measured values. - Reported statistics and error estimates:
- EC50 calculated by means of the modified probit method.
Any other information on results incl. tables
Cell concentration data:
Test-Substance Concentration [mg/l] |
Cell concentrations (mean values) |
||||
measured 0 h 24 h 48 h 72 h 96 h |
|||||
0 |
1.25 |
6.26 |
34.9 |
174 |
516 |
32 |
1.18 |
5.61 |
33.0 |
157 |
547 |
56 |
1.24 |
6.26 |
35.8 |
187 |
597 |
100 |
1.30 |
4.85 |
25.0 |
127 |
267 |
180 |
1.39 |
4.30 |
18.5 |
59.6 |
101 |
320 |
1.29 |
4.28 |
3.52 |
8.11 |
15.0 |
|
|
|
|
|
|
Effect data: cell multiplication inhibition:
Based on nominal concentrations
Biomass Growth rate
EbC50 (95% CL) ErC50 (95% CL)
[mg/l] [mg/l]
24 h 180(130-270) 280 (200-480)
48 h 150 (120-210) 290 (200-540)
72 h 140 (110-180) >320 (n/a)
96 h 130 (110 -150) >320 (n/a)
Based on measured concentrations:
Biomass Growth rate
EbC50 (95% CL) ErC50 (95% CL)
[mg/l] [mg/l]
96 h 79(65 -97) >256 (n/a)Applicant's summary and conclusion
- Executive summary:
The potential of PAC to inhibit algae growth was studied in the unicellular green alga S. capricornutum. Algae were exposed to nominal concentrations ranging from 32 to 320 mg/l for 96 consecutive hours. 3 samples/concentration and 6 samples for controls were used. The cellular growth was evaluated by measuring the cell density. The mean area under the curve and the mean specific growth rate were calculated.
In this study, the 96h NOEC was found to be 25 mg/L (measured concentration), and the EC50 based on the biomass is 79 mg/L (measured concentration). The average growth rate of controls was > 400 times after 72 hours, fulfilling the validity criteria.
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