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EC number: 603-290-2 | CAS number: 128625-52-5
- 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:
- 2019-09-17 to 2019-09-25
- 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)
- Version / remarks:
- March 23, 2006; Annex 5 corrected July 28, 2011
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: Commission Regulation (EU) 2016/266.
- Version / remarks:
- December 7, 2015
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Analytical monitoring:
- yes
- Details on sampling:
- For the analytical measurement a sample from the freshly prepared test medium from the concentration of the closed system was taken at the start of the study. For the determination of the maintenance of the test material concentration during the exposure period a sample was taken from the medium at the end of the exposure period.
- Vehicle:
- no
- Details on test solutions:
- The test media (reconstituted water) was freshly prepared. A stock preparation with a test item concentration of 100 mg/L was freshly prepared. For that purpose, the test item was weighed in a calibrated flask and vehicle, reconstituted water was added. The preparation was stirred with a magnetic stirrer for 1 hour. Then the formulation was passed through a filter membrane (pore size: 0.2 pm). The filtrate was used for the preparation of the different concentrations. The pH was not adjusted.
- Test organisms (species):
- Raphidocelis subcapitata (previous names: Pseudokirchneriella subcapitata, Selenastrum capricornutum)
- Details on test organisms:
- TEST ORGANISM
- Common name: green algae
- Strain: SAG 6181
- Source: Pflanzenphysiologisches Institut der Universität Göttingen, Germany
ACCLIMATION
- Acclimation period: No - Test type:
- static
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 72 h
- Hardness:
- 24 mg CaCO3/L
- Test temperature:
- 21.0 - 24.0°C
- pH:
- 5.32 to 8.68
- Nominal and measured concentrations:
- Nominal measured: 0.0, 1.0, 3.2, 10.0, 31.6, 100,0
- Details on test conditions:
- TEST SYSTEM
- Test vessel: Erlenmeyer flasks
- Type: open
- Material, size, fill volume: glass, 300 mL, 100 mL
- Aeration: No
- No. of vessels per concentration (replicates): 3
- No. of vessels per control (replicates): 3
GROWTH MEDIUM
- Standard medium used: yes
TEST MEDIUM / WATER PARAMETERS
- Preparation of dilution water: according to OECD 201
OTHER TEST CONDITIONS
- Sterile test conditions: yes
- Adjustment of pH: no
- Photoperiod: Continuous illumination
EFFECT PARAMETERS MEASURED: Algae cell density of the pre-culture was determined with an electronic particle counter (Coulter-Counter Z2, Beckman Coulter GmbH, Krefeld, Germany).
TEST CONCENTRATIONS
- Range finding study: yes
- Test concentrations: 1, 10, 100 mg/L
- Results used to determine the conditions for the definitive study: yes - Reference substance (positive control):
- no
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 2.54 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.:
- 0.72 mg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Duration:
- 72 h
- Dose descriptor:
- EC10
- Effect conc.:
- 0.21 mg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Duration:
- 72 h
- Dose descriptor:
- EC10
- Effect conc.:
- 0.52 mg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Details on results:
- - Exponential growth in the control (for algal test): yes
- Observation of abnormalities: no
- Unusual cell shape: no
- Colour differences: no
- Flocculation: no
- Adherence to test vessels: no
- Aggregation of algal cells: no
- Any stimulation of growth found in any treatment: no
- Any observations (e.g. precipitation) that might cause a difference between measured and nominal values: no
Validity criteria
In the control group, the biomass increased by a factor of 274.8 over 72 hours. Therefore, the validity criterion of increase of biomass by at least a factor of 16 within three days was fulfilled. The mean coefficient of variation of the daily growth rates in the control group (section-by-section growth rates) during 72 hours was 25.34%. According to the OECD test guideline, the mean coefficient of variation must not be higher than 35%. Thus, the validity criterion was fulfilled. The coefficient of variation of the average specific growth rates in the replicates of the control group after 72 hours was 1.30%. According to the OECD test guideline, the coefficient of variation must not be higher than 7%. Thus, the validity criterion was fulfilled - Validity criteria fulfilled:
- yes
- Conclusions:
- Under the conditions of the present study according to OECD 201, the test item showed a 72h EC50 of 2.54 mg/L for the growth rate and 0.72 mg/L for the yield of the unicellular green alga with 72-h EC10 of 0.52 mg/L for growth and 0.21 mg/L for the yield.
- Executive summary:
The objective of the present study was to determine the effect of the test item on growth rate and yield of the unicellular green alga Pseudokirchneriella subcapitata according to OECD 201. For this purpose, exponentially growing cultures of green algae were exposed to five different concentrations of the test item for a period of 72 hours. Growth of the algae was determined after 24, 48 and 72 hours exposure and compared with the growth of the control group. From the results, EC values for growth rate and yield were calculated. Samples of the test and control media were taken directly after preparation and then daily and the test item concentration were analyzed via HPLC with UV detection. The purpose of the analytical part of this study was to verify the concentrations of the test item in the test medium. As the test item concentrations could not be maintained >80% of the measured initial concentrations, the EC values were calculated based on the calculated geometric mean concentrations. For measured concentrations <LOQ the concentrations used for calculation of the geometric mean were extrapolated with the mean recovery of the higher concentrations at the same time point where analytical values were >LOQ. Under the conditions of the present study, the test item showed a 72h EC50 of 2.54 mg/L for the growth rate and 0.72 mg/L for the yield with a 72-h EC10 of 0.52 mg/L for growth and 0.21 mg/L for the yield of the unicellular green alga Pseudokirchneriella subcapitata. The accuracy and reliability of the test method is demonstrated periodically as recommended by OECD Guideline No. 201 and the Commission Regulation (EU) 2016/266
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
- Justification for type of information:
- Please refer to attached QMRF and QPRF Documents
- Qualifier:
- according to guideline
- Guideline:
- other: Guidance on information requirements and chemical safety assessment, Chapter R.6: QSARs and grouping of chemicals
- Deviations:
- not applicable
- Principles of method if other than guideline:
- Calculation of toxicity in Algae. Software used: ECOSAR 1.11 (EPISUITE) for chemical class "Neutral Organics"
- GLP compliance:
- no
- Specific details on test material used for the study:
- Smiles: c12c(cccc1)N(OP(N1CCCC1)(N1CCCC1)N1CCCC1)N=N2
- Analytical monitoring:
- not required
- Vehicle:
- no
- Test organisms (species):
- other: Algae
- Water media type:
- freshwater
- Remarks on exposure duration:
- acute and chronic exposure
- Key result
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 1.531 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Key result
- Duration:
- 96 h
- Dose descriptor:
- NOEC
- Effect conc.:
- 0.691 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Conclusions:
- sing ECOSAR v1.11 the toxicity 96-h EC50 and NOEC values for Algae were determined to be 1.531 mg/L, and 0.691 mg/L, respectively. The substance is within the applicability domain of the model.
- Executive summary:
Using ECOSAR v1.11 the toxicity 96-h EC50 and NOEC values for Algae were determined to be 1.531 mg/L, and 0.691 mg/L, respectively. The substance is within the applicability domain of the model.
The adequacy of a prediction depends on the following conditions:
a) the (Q)SAR model is scientifically valid: the scientific validity is established according to the OECD principles for (Q)SAR validation;
b) the (Q)SAR model is applicable to the query chemical: a (Q)SAR is applicable if the query chemical falls within the defined applicability domain of the model;
c) the (Q)SAR result is reliable: a valid (Q)SAR that is applied to a chemical falling within its applicability domain provides a reliable result;
d) the (Q)SAR model is relevant for the regulatory purpose.
For assessment and justification of these 4 requirements the QMRF and QPRF files were developed and attached to this study record.
Description of the prediction Model
The prediction model was descripted using the harmonised template for summarising and reporting key information on (Q)SAR models. For more details please refer to the attached QSAR Model Reporting Format (QMRF) file.
Assessment of estimation domain
The assessment of the estimation domain was documented in the QSAR Prediction Reporting Format file (QPRF). Please refer to the attached document for the details of the prediction and the assessment of the estimation domain.
Referenceopen allclose all
Table 1: Measured concentrations
Nominal test item concentration [mg/L] |
Analytical results (samples inoculated with algae) including extrapolated values |
Geometric Mean [mg/L] |
||||||||
0h |
24 h |
48 h |
72 h |
|||||||
Meas. Conc. [mg/L] |
[%] |
Meas. Conc. [mg/L] |
[%] |
Meas. Conc. [mg/L] |
[%] |
Meas. Conc. [mg/L] |
[%] |
|||
0.0 |
<LOQ |
- |
<LOQ |
- |
<LOQ |
- |
<LOQ |
- |
- |
|
1.0 |
0.752 |
75.2 |
0.165 |
- |
0.036 |
- |
0.016 |
- |
0.09 |
|
3.2 |
2.305 |
72.0 |
0.483 |
15.1 |
0.115 |
- |
0.051 |
- |
0.26 |
|
10.0 |
7.322 |
73.2 |
1.662 |
16.6 |
0.305 |
3.1 |
0.160 |
- |
0.81 |
|
31.6 |
24.860 |
78.7 |
5.188 |
16.4 |
1.175 |
3.7 |
0.423 |
1.3 |
2.69 |
|
100.0 |
78.300 |
78.3 |
17.998 |
18.0 |
4.055 |
4.1 |
1.790 |
1.8 |
9.55 |
Table 2: EC values determined for the test item
Parameter (0-72h) |
Growth Rate |
Yield |
EC10 [mg/L] 95% confidence interval |
0.52 (0.32 - 0.72) |
0.21 (0.15-0.26) |
EC20 [mg/L] 95% confidence interval |
0.89 (0.63-1.15) |
0.32 (0.25-0.38) |
EC50 [mg/L] 95% confidence interval |
2.54 (2.09 - 3.09) |
0.72 (0.63 - 0.82) |
ECOSAR v1.11 Class-specific Estimations
--------------------------------------
Benzotriazoles
Predicted
ECOSAR Class Organism Duration End Pt mg/L (ppm)
=========================== ================== ========
Benzotriazoles : Green Algae 96-hr EC50 1.531
Benzotriazoles : Green Algae 96 -hr ChV 0.691
Description of key information
Under the conditions of the present study according to OECD 201, the test item showed a 72h EC50 of 2.54 mg/L for the growth rate and 0.72 mg/L for the yield of the unicellular green alga with 72-h EC10 of 0.52 mg/L for growth and 0.21 mg/L for the yield (reference 6.1.5 -2).
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 2.54 mg/L
- EC10 or NOEC for freshwater algae:
- 0.52 mg/L
Additional information
The objective of the present study was to determine the effect of the test item on growth rate and yield of the unicellular green alga Pseudokirchneriella subcapitata according to OECD 201. For this purpose, exponentially growing cultures of green algae were exposed to five different concentrations of the test item for a period of 72 hours. Growth of the algae was determined after 24, 48 and 72 hours exposure and compared with the growth of the control group. From the results, EC values for growth rate and yield were calculated. Samples of the test and control media were taken directly after preparation and then daily and the test item concentration were analyzed via HPLC with UV detection. The purpose of the analytical part of this study was to verify the concentrations of the test item in the test medium. As the test item concentrations could not be maintained >80% of the measured initial concentrations, the EC values were calculated based on the calculated geometric mean concentrations. For measured concentrations <LOQ the concentrations used for calculation of the geometric mean were extrapolated with the mean recovery of the higher concentrations at the same time point where analytical values were >LOQ. Under the conditions of the present study, the test item showed a 72h EC50 of 2.54 mg/L for the growth rate and 0.72 mg/L for the yield with a 72-h EC10 of 0.52 mg/L for growth and 0.21 mg/L for the yield of the unicellular green alga Pseudokirchneriella subcapitata. The accuracy and reliability of the test method is demonstrated periodically as recommended by OECD Guideline No. 201 and the Commission Regulation (EU) 2016/266.
For additional supporting data, QSAR was used for the evlaution of the test item:
Using ECOSAR v1.11 the toxicity 96-h EC50 and NOEC values for Algae were determined 1.531 mg/L and 0.691 mg/L, respectively. The substance is within the applicability domain of the model.
The adequacy of a prediction depends on the following conditions:
a) the (Q)SAR model is scientifically valid: the scientific validity is established according to the OECD principles for (Q)SAR validation;
b) the (Q)SAR model is applicable to the query chemical: a (Q)SAR is applicable if the query chemical falls within the defined applicability domain of the model;
c) the (Q)SAR result is reliable: a valid (Q)SAR that is applied to a chemical falling within its applicability domain provides a reliable result;
d) the (Q)SAR model is relevant for the regulatory purpose.
For assessment and justification of these 4 requirements the QMRF and QPRF files were developed and attached to this study record.
Description of the prediction Model
The prediction model was descripted using the harmonised template for summarising and reporting key information on (Q)SAR models. For more details please refer to the attached QSAR Model Reporting Format (QMRF) file.
Assessment of estimation domain
The assessment of the estimation domain was documented in the QSAR Prediction Reporting Format file (QPRF). Please refer to the attached document for the details of the prediction and the assessment of the estimation domain.
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